Plan clock
- Status
- Approved, expires 2028-01-02
- Plan
- Sussex County Hazard Mitigation Plan (FEMA plan 108411)
- Approved
- 2023-01-03
- Expires
- 2028-01-02
- As of
- 2026-09-28
- Days
- 461 days to expiry
- Update underway
- FEMA tracker shows a plan in progress
What changed since your last plan (approved 2023-01-03)
- New federal declarations
- DR-4916-DE (1 declaration row; 1 counted incident)
- Storm Events records since approval
- 90 (data through 2026-06-30)
- Repetitive loss now
- FMA RL 4, SRL 26 (44 CFR 77.2); any definition: 307
- Repeat-flood change
- First release: no prior release to compare.
Sources
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
FEMA, OpenFEMA DisasterDeclarationsSummaries v2, version 2026-09-27T010817Z, pulled 2026-09-28, https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries (API)
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/NfipMultipleLossProperties (API)
Plan status for every jurisdiction listed in this county: 26 rows, in the section "Plan clock: Plan status for every jurisdiction listed in this county" after these cover pages.
State plan status and tribal plans in this state: see the state page.
Plan clock
Plan status for every jurisdiction listed in this county
| Jurisdiction | Type | Status | Plan | Approved | Expires | Days to expirynegative = days since expiry | Update underway | Notes |
|---|---|---|---|---|---|---|---|---|
| Sussex County | County | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | member approved 2023-04-25 |
| Bethany Beach town | Town | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | member approved 2023-02-17 |
| Bethel town | Town | No approved plan on record | none | none | none | FEMA tracker shows a plan in progress | ||
| Blades town | Town | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | member approved 2025-01-13 |
| Bridgeville town | Town | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | |
| Dagsboro town | Town | No approved plan on record | none | none | none | FEMA tracker shows a plan in progress | ||
| Delmar town | Town | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | member approved 2024-12-02 |
| Dewey Beach town | Town | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | member approved 2023-01-13 |
| Ellendale town | Town | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | member approved 2023-01-04 |
| Fenwick Island town | Town | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | member approved 2023-01-27 |
| Frankford town | Town | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | member approved 2024-12-02 |
| Georgetown town | Town | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | member approved 2023-02-13 |
| Greenwood town | Town | No approved plan on record | none | none | none | FEMA tracker shows a plan in progress | ||
| Henlopen Acres town | Town | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | |
| Laurel town | Town | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | member approved 2024-11-18 |
| Lewes city | City | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | member approved 2023-08-14 |
| Milford city | City | Expired on 2026-04-19 | Kent County Hazard Mitigation Plan (FEMA plan 106435) | 2021-04-20 | 2026-04-19 | -162 | FEMA tracker shows a plan approvable pending adoption | Not yet eligible: adopt the approved plan. |
| Millsboro town | Town | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | |
| Millville town | Town | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | member approved 2023-01-10 |
| Milton town | Town | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | member approved 2023-02-13 |
| Ocean View town | Town | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | |
| Rehoboth Beach city | City | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | member approved 2024-11-15 |
| Seaford city | City | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | member approved 2023-01-10 |
| Selbyville town | Town | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | member approved 2023-01-10 |
| Slaughter Beach town | Town | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress | member approved 2024-12-11 |
| South Bethany town | Town | Approved, expires 2028-01-02 | Sussex County Hazard Mitigation Plan (FEMA plan 108411) | 2023-01-03 | 2028-01-02 | 461 | FEMA tracker shows a plan in progress |
Source
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
Supports B1-a: hazards
Hazards NRI does not cover: check locally
- dam failure (incl. upstream dams)
- levee failure
- flash flood as its own subtype
- ice jams
- debris flows
- erosion (riverine and coastal)
- land subsidence and sinkholes
- expansive soils
The 18 National Risk Index hazards, ranked by expected annual loss (EAL)
| Rank by EAL | Hazard | NRI risk rating | EAL rating | EAL buildingsmodeled dollars per year | EAL agriculturemodeled dollars per year | EAL population equivalencestatistical value of life and injury, $13.7M per life, not property damage | EAL total (see note)modeled dollars per year | Storm Events records since 1996count | Evidence for an omissionNRI Not Applicable, no declaration and no Storm Events record since 1996 | Storm Events coverage note |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Inland Flooding | Relatively Moderate | Relatively Moderate | $40,254,893 | $1,798,764 | $554,403 | $42,608,060 | 112 | ||
| 2 | Hurricane | Relatively High | Relatively High | $25,442,157 | $9,355,258 | $514,546 | $35,311,960 | 7 | ||
| 3 | Cold Wave | Relatively High | Relatively High | $3,262 | $53,181 | $16,751,057 | $16,807,500 | 27 | Includes 1 Frost/Freeze record, event types the NRI definition of this hazard leaves out. | |
| 4 | Coastal Flooding | Very High | Very High | $14,125,960 | $46,980 | $14,172,943 | 94 | |||
| 5 | Heat Wave | Relatively Moderate | Relatively Moderate | under $1 | $4,172 | $2,307,003 | $2,311,175 | 81 | ||
| 6 | Tornado | Relatively Low | Relatively Low | $842,306 | $7,716 | $739,863 | $1,589,885 | 11 | ||
| 7 | Earthquake | Relatively Low | Relatively Low | $1,294,797 | $227,760 | $1,522,557 | Not in Storm Events. Storm Events coverage of this hazard is limited; absence is not evidence of low risk. | |||
| 8 | Strong Wind | Relatively High | Relatively Moderate | $540,151 | $53,564 | $701,726 | $1,295,442 | 518 | Includes 68 High Wind records and 148 Strong Wind records, event types the NRI definition of this hazard leaves out. | |
| 9 | Drought | Relatively Moderate | Relatively Moderate | $1,060,189 | $1,060,189 | 53 | ||||
| 10 | Winter Weather | Very High | Relatively High | $280,076 | $276 | $446,463 | $726,815 | 155 | Includes 2 Sleet records, event types the NRI definition of this hazard leaves out. | |
| 11 | Lightning | Relatively High | Relatively Moderate | $226,726 | $437,797 | $664,522 | 81 | |||
| 12 | Wildfire | Relatively Low | Relatively Low | $472,767 | $1,916 | $63,389 | $538,072 | 9 | ||
| 13 | Ice Storm | Relatively Moderate | Relatively Moderate | $323,527 | $61,934 | $385,461 | 0 | Declared 1 time; no Storm Events record of this type. | ||
| 14 | Hail | Relatively Low | Relatively Low | $26,314 | $279,024 | $353 | $305,691 | 35 | ||
| 15 | Landslide | Very Low | Very Low | $1,105 | $3 | $1,109 | 0 | No recorded events in Storm Events since 1996 (data through 2026-06-30). Storm Events coverage of this hazard is limited; absence is not evidence of low risk. | ||
| Avalanche | Not Applicable | Not Applicable | 0 | NRI rates avalanche Not Applicable for this county, and no federal declaration for this county names it. | No recorded events in Storm Events since 1996 (data through 2026-06-30). | |||||
| Tsunami | Insufficient Data | Insufficient Data | 1 | |||||||
| Volcanic Activity | Not Applicable | Not Applicable | 0 | NRI rates volcanic activity Not Applicable for this county, and no federal declaration for this county names it. | No recorded events in Storm Events since 1996 (data through 2026-06-30). Storm Events coverage of this hazard is limited; absence is not evidence of low risk. |
Total = buildings + agriculture + population equivalence; FEMA values each expected death (or 10 injuries) at $13.7 million (2024 dollars).
Sources
FEMA, FEMA National Risk Index 1.20.0 (December 2025), county and census tract tables, version 1.20.0, pulled 2026-09-28, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_Counties.zip (download, 25 MB), https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip (download, 635 MB)
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
Check your state hazard mitigation plan's hazard list for this county; explain any hazard you drop.
Supports B1-b: location
Where each hazard occurs
| Hazard | Location | Census tracts ratedrated of all tracts |
|---|---|---|
| Avalanche | Census tract rating counts from the National Risk Index tract table (see B1-f). Tract maps and place names are not in this packet. | 0 of 74 |
| Coastal Flooding | The FEMA Flood Insurance Rate Map (FIRM) is the required location source for flooding. See the FEMA Flood Map Service Center (https://msc.fema.gov) for this county. | 67 of 74 |
| Cold Wave | Affects the whole planning area; national data do not distinguish locations within the county. Confirm locally. | 74 of 74 |
| Drought | Affects the whole planning area; national data do not distinguish locations within the county. Confirm locally. | 68 of 74 |
| Earthquake | Census tract rating counts from the National Risk Index tract table (see B1-f). Tract maps and place names are not in this packet. | 74 of 74 |
| Hail | Affects the whole planning area; national data do not distinguish locations within the county. Confirm locally. | 74 of 74 |
| Heat Wave | Affects the whole planning area; national data do not distinguish locations within the county. Confirm locally. | 74 of 74 |
| Hurricane | Census tract rating counts from the National Risk Index tract table (see B1-f). Tract maps and place names are not in this packet. | 74 of 74 |
| Ice Storm | Affects the whole planning area; national data do not distinguish locations within the county. Confirm locally. | 74 of 74 |
| Inland Flooding | The FEMA Flood Insurance Rate Map (FIRM) is the required location source for flooding. See the FEMA Flood Map Service Center (https://msc.fema.gov) for this county. | 74 of 74 |
| Landslide | Census tract rating counts from the National Risk Index tract table (see B1-f). Tract maps and place names are not in this packet. | 74 of 74 |
| Lightning | Affects the whole planning area; national data do not distinguish locations within the county. Confirm locally. | 74 of 74 |
| Strong Wind | Affects the whole planning area; national data do not distinguish locations within the county. Confirm locally. | 74 of 74 |
| Tornado | Census tract rating counts from the National Risk Index tract table (see B1-f). Tract maps and place names are not in this packet. | 74 of 74 |
| Tsunami | Census tract rating counts from the National Risk Index tract table (see B1-f). Tract maps and place names are not in this packet. | 0 of 74 |
| Volcanic Activity | Census tract rating counts from the National Risk Index tract table (see B1-f). Tract maps and place names are not in this packet. | 0 of 74 |
| Wildfire | Census tract rating counts from the National Risk Index tract table (see B1-f). Tract maps and place names are not in this packet. | 74 of 74 |
| Winter Weather | Affects the whole planning area; national data do not distinguish locations within the county. Confirm locally. | 74 of 74 |
Source
FEMA, FEMA National Risk Index 1.20.0 (December 2025), county and census tract tables, version 1.20.0, pulled 2026-09-28, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_Counties.zip (download, 25 MB), https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip (download, 635 MB)
Supports B1-c: extent
Extent: scale, observed range and worst recorded event per hazard
| Hazard | Scale | Recordscount, years | Observed range | Worst recorded event | Most damaging (when different) | How it applies to members | Note |
|---|---|---|---|---|---|---|---|
| Avalanche | none (count and damage) | 0 | Physical measure: in event narratives only; local data required. | ||||
| Coastal Flood, Storm Surge/Tide | none in data (FIRM for depth) | 94, 1996 to 2026 (94 zone-level) | Coastal Flood, 2009-11-12, $40,000,000 property; $0 crops, reported for the zone (2009 dollars); NWS zone DEZ004 (DELAWARE BEACHES), zone-level: may include parts of neighboring counties | Zone-level records: applies countywide; national data do not locate these events within the county. | Flood depth: see the FEMA Flood Insurance Rate Map. | ||
| Cold/Wind Chill, Extreme Cold/Wind Chill | wind chill | 26, 1996 to 2015 (26 zone-level) | 1 day to 16 days (median 2 days); 21 with a recorded value | 16 consecutive days, 2003-01-14 to 2003-01-29, zone-level | Zone-level records: applies countywide; national data do not locate these events within the county. | Wind chill: in event narratives only; local data required. Cold/Wind Chill records from May to September (a frost night, not a cold wave) are counted but not used for the longest run. | |
| Frost/Freeze (outside NRI Cold Wave definition) | crop damage | 1, 2007 to 2007 (1 zone-level) | No crop damage reported in 1 records. | Zone-level records: applies countywide; national data do not locate these events within the county. | Temperature: in event narratives only; local data required. | ||
| Drought | US Drought Monitor D-scale | 53, 1997 to 2012 (53 zone-level) | 1 day to 288 days (median 20 days); 17 with a recorded value | 288 days (about 9.5 months), 2007-07-24 to 2008-05-06, a run of 11 consecutive Storm Events drought records, zone-level | Drought, 1999-09-01, property not reported; $20,100,000 crops, reported for the zone (1999 dollars) | Zone-level records: applies countywide; national data do not locate these events within the county. | Storm Events enters a drought at D2 or worse east of the Rockies and D3 or worse from the Rockies west (NWS Instruction 10-1605); NRI drought counts D3 and D4 only. |
| Earthquake | Modified Mercalli (local data) | 0 | No Storm Events record; local data required (e.g., USGS). | ||||
| Hail | hail size (inches) | 48, 1968 to 2025 | 0.75 in to 2.25 in (median 1 in); 48 with a recorded value | 2.25 in hail, 2022-05-16 | Hail, 2009-06-13, $0 property; $300,000 crops (2009 dollars) | Event records naming member places: Laurel town (4 records), Millsboro town (4 records), Blades town (3 records), Delmar town (3 records), Bridgeville town (2 records), Greenwood town (2 records), Rehoboth Beach city (2 records), Bethany Beach town (1 record), Dewey Beach town (1 record), Ellendale town (1 record); and 2 more member places (see the XLSX file). | |
| Excessive Heat, Heat | heat index (narratives) | 81, 1996 to 2025 (81 zone-level) | 1 day to 10 days (median 3 days); 54 with a recorded value | 10 consecutive days, 2002-08-11 to 2002-08-20, zone-level | Zone-level records: applies countywide; national data do not locate these events within the county. | Heat index: in event narratives only; local data required. Heat records from November to March (unseasonable warmth, not a heat wave) are counted but not used for the longest run. | |
| Hurricane, Tropical Storm, Tropical Depression | Saffir-Simpson | 7, 1996 to 2020 (7 zone-level) | Strongest recorded (records with damage, a wind speed or direct casualties first, then storm type, category and wind): Hurricane (Typhoon) record, 1999-09-16, 57 kt (66 mph), measurement type not recorded, $50,000 property; $0 crops, reported for the zone (1999 dollars); NWS zone DEZ004 (DELAWARE BEACHES), zone-level: may include parts of neighboring counties | Most damaging recorded: Tropical Storm, 2003-09-18, $8,000,000 property; crops not reported, reported for the zone (2003 dollars) | Zone-level records: applies countywide; national data do not locate these events within the county. | Storm Events files every zone of a storm's episode under the storm's event type and category, so a Hurricane (Typhoon) record, especially an inland or remnant one, does not by itself mean hurricane-force winds here; read the damage and wind columns. | |
| Ice Storm | Sperry-Piltz (local data) | 0 | Ice thickness: in event narratives only; local data required. | ||||
| Flash Flood, Flood, Lakeshore Flood | damage and flood days (FIRM for depth) | 112, 1999 to 2025 (12 zone-level) | Flash Flood, 2001-08-11, $1,100,000 property; crops not reported (2001 dollars) | Event records naming member places: Bethany Beach town (11 records), Blades town (5 records), Bridgeville town (5 records), Dewey Beach town (4 records), Ellendale town (4 records), Georgetown town (4 records), Ocean View town (4 records), Dagsboro town (3 records), Millsboro town (3 records), Milton town (3 records); and 11 more member places (see the XLSX file). Zone-level records (12) apply countywide. | Flood depth: see the FEMA Flood Insurance Rate Map. Storm Events damage can be $0 or blank even for a major flood, so the worst record here may not be the worst flood; compare FEMA Public Assistance by declaration in B1-d. | ||
| Debris Flow | none (count and damage) | 0 | Physical measure: in event narratives only; local data required. | ||||
| Lightning | annualized frequency (the measure FEMA's Local Mitigation Planning Handbook names) | 81, 1998 to 2026 | Lightning, 2003-08-30, $800,000 property; $0 crops (2003 dollars) | Event records naming member places: Lewes city (8 records), Seaford city (7 records), Ocean View town (6 records), Rehoboth Beach city (6 records), Georgetown town (5 records), Millville town (5 records), Bethany Beach town (4 records), Milton town (4 records), Dewey Beach town (3 records), Bridgeville town (2 records); and 10 more member places (see the XLSX file). | Storm Events lists lightning with damage or casualties; physical measure in event narratives only; local data required. | ||
| High Wind and Strong Wind (outside NRI Strong Wind definition) | wind speed (kt and mph) | 216, 1996 to 2026 (216 zone-level) | 35 kt (40 mph) to 71 kt (82 mph) (median 44 kt (51 mph)); 183 with a recorded value | 71 kt (82 mph), measurement type not recorded, High Wind, 1998-01-28; NWS zone DEZ004 (DELAWARE BEACHES), zone-level: may include parts of neighboring counties | High Wind, 2012-10-29, $200,000 property; $0 crops, reported for the zone (2012 dollars) | Zone-level records: applies countywide; national data do not locate these events within the county. | |
| Thunderstorm Wind | wind speed (kt and mph) | 372, 1957 to 2026 | 50 kt (58 mph) to 100 kt (115 mph) (median 50 kt (58 mph)); 306 with a recorded value | 100 kt (115 mph), measurement type not recorded, Thunderstorm Wind, 1991-07-07, 2 direct injuries | Thunderstorm Wind, 1995-11-11, $1,000,000 property; crops not recorded (1995 dollars) | Event records naming member places: Georgetown town (24 records), Bridgeville town (22 records), Dewey Beach town (22 records), Laurel town (20 records), Greenwood town (16 records), Blades town (15 records), Lewes city (15 records), Millsboro town (11 records), Seaford city (10 records), Dagsboro town (9 records); and 12 more member places (see the XLSX file). | |
| Tornado | Enhanced Fujita (F before Feb 2007) | 28, 1955 to 2025 | F/EF0 to F/EF3 (median F/EF1); 28 with a recorded value | EF3 tornado, 2023-04-01, 14.3 mi within this county, 700 yd wide, $0 property; $0 crops (2023 dollars), 1 direct death | Tornado, 1984-05-08, $250,000 property; crops not recorded (1984 dollars) | Event records naming member places: Bethel town (2 records), Bridgeville town (1 record), Dagsboro town (1 record), Dewey Beach town (1 record), Ellendale town (1 record), Frankford town (1 record), Greenwood town (1 record), Slaughter Beach town (1 record). | From 1996 on, tornado records are per-county segments and length is the path length within this county (NWS Instruction 10-1605); records before 1996 may give the whole path length, including the path outside this county, and before 1996 a tornado is listed once, under the county where it began, with the whole path's rating; counties farther along the path may not list it. Length is not used to rank tornadoes. |
| Tsunami | none (count and damage) | 1, 2013 to 2013 (1 zone-level) | No damage reported in 1 records. | Zone-level records: applies countywide; national data do not locate these events within the county. | Physical measure: in event narratives only; local data required. | ||
| Volcanic Ash, Volcanic Ashfall | Volcanic Explosivity Index (local data) | 0 | Physical measure: in event narratives only; local data required. | ||||
| Wildfire | acres burned (local data) | 9, 2000 to 2006 (7 zone-level) | Wildfire, 2006-03-14, $5,000 property; crops not reported, reported for the zone (2006 dollars); NWS zone DEZ003 (INLAND SUSSEX), zone-level: may include parts of neighboring counties | Event records naming member places: Dagsboro town (1 record), Georgetown town (1 record). Zone-level records (7) apply countywide. | Acres burned: in event narratives only; local data required. | ||
| Winter Storm, Heavy Snow, Blizzard, Lake-Effect Snow, Winter Weather, Sleet | none in data (snowfall local) | 155, 1996 to 2026 (155 zone-level) | Winter Storm, 2010-02-09, $1,500,000 property; $0 crops, reported for the zone (2010 dollars); NWS zone DEZ004 (DELAWARE BEACHES), zone-level: may include parts of neighboring counties | Winter Storm, 2010-02-09, $1,500,000 property; $0 crops, reported for the zone (2010 dollars) | Zone-level records: applies countywide; national data do not locate these events within the county. | Snow depth: in event narratives only; local data required. |
Where a hazard names more than 10 member places, the table lists the 10 with the most records; every place is in the XLSX file, sheet "B1-c Extent".
Storm Events records are more complete after 1996; before 1996 only Tornado (from 1950), Hail and Thunderstorm Wind (from 1955) exist. Zone-level records are placed with NWS zone-county files, which exist from 2020 on; an earlier record is placed by its zone number in the nearest later file only when its zone name matches that file, records from zones NWS renumbered are placed by name or left out, and a record whose zone is in no known file is left out of every count, so counts before 2020 can be low. Some current zones are also missing from the NWS files, so recent counts can be low too.
Dollars are nominal (as reported), labeled with the year; not adjusted for inflation.
Sources
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
NOAA National Weather Service, NWS county-public forecast zones correlation file, version bp03mr20 to bp16ap26 (11 files; newest bp16ap26), pulled 2026-09-28, https://www.weather.gov/gis/ZoneCounty
Supports B1-d: previous occurrences
- Declaration rows
- 20
- Counted incidents
- 15
Federal disaster declarations for this county
| Declared | Incident began | FEMA number | Type | Title | Mapped hazard | County Public Assistancefederal share obligated, nominal dollars | Flags | Notes |
|---|---|---|---|---|---|---|---|---|
| 2026-05-29 | 2026-02-22 | DR-4916-DE | Major disaster | SEVERE WINTER STORM | Winter Weather | $139,557.68 | new since last plan; within last 5 years | |
| 2020-04-05 | 2020-01-20 | DR-4526-DE | Major disaster | COVID-19 PANDEMIC | Non-natural, not counted | $29,503,949.62 | ||
| 2020-03-13 | 2020-01-20 | EM-3449-DE | Emergency | COVID-19 | Non-natural, not counted | none found | same incident as DR-4526 | |
| 2016-03-16 | 2016-01-22 | DR-4265-DE | Major disaster | SEVERE WINTER STORM AND SNOWSTORM | Winter Weather | $998,622.64 | ||
| 2012-11-16 | 2012-10-27 | DR-4090-DE | Major disaster | HURRICANE SANDY | Hurricane | $436,531.65 | ||
| 2012-10-29 | 2012-10-27 | EM-3357-DE | Emergency | HURRICANE SANDY | Hurricane | none found | same incident as DR-4090 | |
| 2011-09-30 | 2011-08-25 | DR-4037-DE | Major disaster | HURRICANE IRENE | Hurricane | $288,324.13 | ||
| 2011-08-28 | 2011-08-26 | EM-3336-DE | Emergency | HURRICANE IRENE | Hurricane | none found | same incident as DR-4037 | |
| 2010-03-31 | 2010-02-05 | DR-1896-DE | Major disaster | SEVERE WINTER STORMS AND SNOWSTORMS | Winter Weather | $809,249.43 | ||
| 2006-07-05 | 2006-06-23 | DR-1654-DE | Major disaster | SEVERE STORMS AND FLOODING | Inland Flooding | $90,742.72 | ||
| 2005-09-30 | 2005-08-29 | EM-3263-DE | Emergency | HURRICANE KATRINA EVACUATION | Hurricane: evacuation support, not a local hazard event; not counted | none found | ||
| 2003-09-20 | 2003-09-18 | DR-1494-DE | Major disaster | HURRICANE ISABEL | Hurricane | $207,907.86 | ||
| 2003-03-20 | 2003-02-14 | EM-3183-DE | Emergency | SNOW | Winter Weather | $115,439.27 | ||
| 1998-02-13 | 1998-01-28 | DR-1205-DE | Major disaster | SEVERE WINTER STORMS, HIGH WINDS, AND FLOODING | Inland Flooding; Strong Wind; Winter Weather | none found | ||
| 1996-01-12 | 1996-01-06 | DR-1082-DE | Major disaster | BLIZZARD OF 96 (SEVERE SNOW STORM) | Winter Weather | none found | ||
| 1994-03-16 | 1994-02-08 | DR-1017-DE | Major disaster | SEVERE ICE STORMS AND FLOODING | Ice Storm; Inland Flooding | none found | ||
| 1993-03-18 | 1993-03-13 | EM-3111-DE | Emergency | SEVERE SNOWFALL & WINTER STORM | Winter Weather | none found | ||
| 1993-01-15 | 1992-12-11 | DR-976-DE | Major disaster | SEVERE COASTAL STORM & FLOODING | Coastal Flooding | none found | ||
| 1992-02-06 | 1992-01-04 | DR-933-DE | Major disaster | SEVERE COASTAL STORM | Coastal Flooding | none found | ||
| 1965-08-18 | 1965-08-18 | DR-207-DE | Major disaster | WATER SHORTAGE | Drought | none found |
County Public Assistance: applicants the FEMA record places in this county, including any state agencies FEMA files there; statewide rows are listed on the state page; federal share obligated, nominal dollars.
Dollars are nominal (as reported), labeled with the year; not adjusted for inflation.
Sources
FEMA, OpenFEMA DisasterDeclarationsSummaries v2, version 2026-09-27T010817Z, pulled 2026-09-28, https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries (API)
FEMA, OpenFEMA PublicAssistanceFundedProjectsSummaries v1, version 2026-09-26T151157Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/PublicAssistanceFundedProjectsSummaries (API)
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
Statewide declarations
| Declared | Incident began | FEMA number | Type | Title | Mapped hazard | Flags | Notes |
|---|---|---|---|---|---|---|---|
| 1962-03-09 | 1962-03-09 | DR-126-DE | Major disaster | SEVERE STORMS, HIGH TIDES & FLOODING | Inland Flooding (primary); also designated: Coastal Flooding |
FEMA recorded these with designated area Statewide and no county. Listed on every county page in the state; not counted with county rows.
Source
FEMA, OpenFEMA DisasterDeclarationsSummaries v2, version 2026-09-27T010817Z, pulled 2026-09-28, https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries (API)
Previous occurrences by hazard, with explicit no-event rows
| Hazard | Storm Events recordsfull period | Since plan approvalrecords | During plan reviewrecords | Last 5 yearsrecords | Declared incidentsdistinct incidents | Declared since approvaldistinct incidents | Period | Statement |
|---|---|---|---|---|---|---|---|---|
| Avalanche | 0 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events |
| Coastal Flooding | 94 | 15 | 5 | 22 | 2 | 0 | 1996 to 2026-06-30 | |
| Cold Wave | 27 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | Includes 1 Frost/Freeze record, event types the NRI definition of this hazard leaves out. |
| Drought | 53 | 0 | 0 | 0 | 1 | 0 | 1996 to 2026-06-30 | |
| Earthquake | 0 | 0 | 0 | 0 | 0 | 0 | No Storm Events record; local data required (e.g., USGS). | |
| Hail | 48 | 3 | 5 | 8 | 0 | 0 | 1955 to 2026-06-30 | |
| Heat Wave | 81 | 2 | 0 | 2 | 0 | 0 | 1996 to 2026-06-30 | |
| Hurricane | 7 | 0 | 0 | 0 | 3 | 0 | 1996 to 2026-06-30 | |
| Ice Storm | 0 | 0 | 0 | 0 | 1 | 0 | 1996 to 2026-06-30 | No Storm Events records of this type; 1 federal declared incident (see declarations table) |
| Inland Flooding | 112 | 6 | 0 | 6 | 3 | 0 | 1996 to 2026-06-30 | |
| Landslide | 0 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events |
| Lightning | 81 | 1 | 1 | 2 | 0 | 0 | 1996 to 2026-06-30 | |
| Strong Wind | 588 | 49 | 23 | 72 | 1 | 0 | 1955 to 2026-06-30 | Includes 68 High Wind records and 148 Strong Wind records, event types the NRI definition of this hazard leaves out. |
| Tornado | 28 | 4 | 0 | 4 | 0 | 0 | 1950 to 2026-06-30 | |
| Tsunami | 1 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | |
| Volcanic Activity | 0 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events |
| Wildfire | 9 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | |
| Winter Weather | 155 | 10 | 6 | 16 | 7 | 1 | 1996 to 2026-06-30 | Includes 2 Sleet records, event types the NRI definition of this hazard leaves out. |
Sources
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
FEMA, OpenFEMA DisasterDeclarationsSummaries v2, version 2026-09-27T010817Z, pulled 2026-09-28, https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries (API)
NOAA National Weather Service, NWS county-public forecast zones correlation file, version bp03mr20 to bp16ap26 (11 files; newest bp16ap26), pulled 2026-09-28, https://www.weather.gov/gis/ZoneCounty
Notable Storm Events records
| Date | Event type | Magnitude or extent | Damagenominal dollars | Direct deaths, injuriesindirect not counted | Location | Flags | Why listed |
|---|---|---|---|---|---|---|---|
| 2023-04-01 | Tornado | EF3, 14.3 mi within this county, 700 yd wide | $0 property; $0 crops (2023 dollars) | 1, 0 | DUBLIN HILL to ELLENDALE | new since last plan; within last 5 years | deaths or injuries recorded |
| 2010-02-09 | Winter Storm | $1,500,000 property; $0 crops, reported for the zone (2010 dollars) | 0, 0 | NWS zone DEZ004 (DELAWARE BEACHES), zone-level: may include parts of neighboring counties | B1-c worst recorded: Winter Storm, Heavy Snow, Blizzard, Lake-Effect Snow, Winter Weather, Sleet | ||
| 2009-11-12 | Coastal Flood | $40,000,000 property; $0 crops, reported for the zone (2009 dollars) | 0, 0 | NWS zone DEZ004 (DELAWARE BEACHES), zone-level: may include parts of neighboring counties | B1-c worst recorded: Coastal Flood, Storm Surge/Tide | ||
| 2007-07-24 | Drought | $0 property; $0 crops, reported for the zone (2007 dollars) | 0, 0 | NWS zone DEZ003 (INLAND SUSSEX), zone-level: may include parts of neighboring counties | B1-c worst recorded: Drought | ||
| 2007-02-06 | Extreme Cold/Wind Chill | $0 property; $0 crops, reported for the zone (2007 dollars) | 1, 1 | NWS zone DEZ003 (INLAND SUSSEX), zone-level: may include parts of neighboring counties | deaths or injuries recorded | ||
| 2003-01-14 | Cold/Wind Chill | damage not reported | 0, 0 | NWS zone DEZ004 (DELAWARE BEACHES), zone-level: may include parts of neighboring counties | B1-c worst recorded: Cold/Wind Chill, Extreme Cold/Wind Chill | ||
| 2002-08-11 | Heat | damage not reported | 0, 0 | NWS zone DEZ004 (DELAWARE BEACHES), zone-level: may include parts of neighboring counties | B1-c worst recorded: Excessive Heat, Heat | ||
| 2001-08-11 | Flash Flood | $1,100,000 property; crops not reported (2001 dollars) | 0, 0 | SOUTHWEST PORTION | B1-c worst recorded: Flash Flood, Flood, Lakeshore Flood | ||
| 1999-09-16 | Hurricane (Typhoon) | $50,000 property; $0 crops, reported for the zone (1999 dollars) | 0, 0 | NWS zone DEZ004 (DELAWARE BEACHES), zone-level: may include parts of neighboring counties | B1-c worst recorded: Hurricane, Tropical Storm, Tropical Depression | ||
| 1998-01-28 | High Wind | 71 kt (82 mph), measurement type not recorded | damage not reported | 0, 0 | NWS zone DEZ004 (DELAWARE BEACHES), zone-level: may include parts of neighboring counties | B1-c worst recorded: High Wind and Strong Wind (outside NRI Strong Wind definition) | |
| 1991-07-07 | Thunderstorm Wind | 100 kt (115 mph), measurement type not recorded | damage not recorded (pre-1996 record) | 0, 2 | location not recorded | B1-c worst recorded: Thunderstorm Wind | |
| 1984-05-08 | Tornado | F1, 6 mi path length (records before 1996 may include the whole path; rating and listing come from the county where the tornado began), 150 yd wide | $250,000 property; crops not recorded (1984 dollars) | 0, 8 | location not recorded | deaths or injuries recorded |
The full list is in the XLSX file, sheet "B1-d Storm Events history" (1,284 rows).
Storm Events records are more complete after 1996; before 1996 only Tornado (from 1950), Hail and Thunderstorm Wind (from 1955) exist. Zone-level records are placed with NWS zone-county files, which exist from 2020 on; an earlier record is placed by its zone number in the nearest later file only when its zone name matches that file, records from zones NWS renumbered are placed by name or left out, and a record whose zone is in no known file is left out of every count, so counts before 2020 can be low. Some current zones are also missing from the NWS files, so recent counts can be low too.
Sources
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
NOAA National Weather Service, NWS county-public forecast zones correlation file, version bp03mr20 to bp16ap26 (11 files; newest bp16ap26), pulled 2026-09-28, https://www.weather.gov/gis/ZoneCounty
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
State-declared emergencies are not in federal data. Add them from your state emergency management agency.
FEMA's declaration data list no tribal or special-area declarations for this state.
Supports B1-e: probability
Probability: FEMA annualized frequency and descriptor per hazard
| Hazard | FEMA annualized frequency (modeled)unit per row | Unit | In plain terms | Descriptor | Descriptor basis | NRI events or days in its record period (hail, wind and tornado are area-weighted, so can be fractional) | NRI period | Location | Note |
|---|---|---|---|---|---|---|---|---|---|
| Avalanche | events per year | 1994 to 2023 (30 years) | see B1-f | Not Applicable in NRI for this county; no descriptor. | |||||
| Coastal Flooding | 3.65 | events per year at a location (modeled) | about 3.7 per year at a given location in the county | Highly likely | FEMA annualized frequency (modeled) | not shown | modeled | see B1-f | Descriptor from NRI: the rate at a location is 1 or more a year, so the county rate is at least that. |
| Cold Wave | 0.787 | event-days per year | about 0.787 days per year | Likely | event-days in 11 of 30 years, 1996 to 2025 (36.7%) | 11.9 | 2005-11-12 to 2024-11-12 (19 years) | countywide | Frost/Freeze records are not counted in this descriptor: they record crop freezes, not cold waves. |
| Drought | 4.26 | event-days per year | about 4.26 days per year | Likely | event-days in 10 of 30 years, 1996 to 2025 (33.3%) | 203 | 2000 to 2025 (25.25 years; D3 and D4 only) | countywide | NRI gives about 4.26 drought event-days a year here (its annualized frequency over 25.25 years; not its event count divided by the years), but Storm Events has a record in only 10 of 30 years. NRI counts from a different source that records far more events than Storm Events, so this descriptor reads much lower than NRI's frequency; read the two together. |
| Earthquake | 0.00104 | annual probability at a location | chance a given location in the county has at least minor-damage shaking in a year: 0.104% | not shown | modeled | see B1-f | Descriptor not assigned: the NRI value is the chance at a location in the county, not how often the hazard affects the county, and Storm Events does not record earthquakes. | ||
| Hail | 0.925 | events per year | about 0.92 per year | Likely | FEMA annualized frequency (modeled) | 35.2 (modeled) | 1986 to 2023 (38 years) | countywide | |
| Heat Wave | 5.03 | event-days per year | about 5.03 days per year | Likely | event-days in 22 of 30 years, 1996 to 2025 (73.3%) | 64.1 | 2005-11-12 to 2024-11-12 (19 years) | countywide | |
| Hurricane | 0.169 | events per year | about 1 in 6 years | Likely | FEMA annualized frequency (modeled) | 70 | 1851 to 2024 (Atlantic) | see B1-f | NRI counts hurricane and tropical storm tracks passing within storm-force wind range; federal declarations are counted separately in B1-d and need not match. |
| Ice Storm | 0.401 | event-days per year | about 0.401 days per year | event-days in 0 of 30 years, 1996 to 2025 (0%) | 23 | 1946-12-31 to 2014-02-12 (67 years) | countywide | No recorded event-days, 1996 to 2025; descriptor not assigned | |
| Inland Flooding | 2.54 | event-days per year | about 2.54 days per year | Likely | event-days in 23 of 30 years, 1996 to 2025 (76.7%) | 71 | 1996 to 2023 (28 years) | see B1-f | |
| Landslide | 0.125 | events per year (modeled) | about 1 in 8 years | Likely | FEMA annualized frequency (modeled) | not shown | modeled | see B1-f | |
| Lightning | 32.8 | days per year with a strike | about 32.8 days per year | Highly likely | FEMA annualized frequency (modeled) | not shown | 1995 to 2023 (29 years; CONUS) | countywide | |
| Strong Wind | 2.36 | events per year | about 2.36 per year | Highly likely | FEMA annualized frequency (modeled) | 73 | 1986 to 2023 (38 years) | countywide | |
| Tornado | 0.34 | events per year | about 1 in 3 years | Likely | FEMA annualized frequency (modeled) | not shown | 1950 to 2023 (EF2+); 1986 to 2023 (EF0-1) | see B1-f | |
| Tsunami | annual probability at the most exposed location (used in place of a county value) | Possible | Storm Events records in 1 of 30 years, 1996 to 2025 (3.33%) | not shown | modeled | see B1-f | Descriptor from Storm Events, not NRI: the NRI value is the chance at a location in the county, not how often the hazard affects the county. | ||
| Volcanic Activity | annual probability | not shown | modeled | see B1-f | Not Applicable in NRI for this county; no descriptor. | ||||
| Wildfire | 0.000987 | annual probability at a location | chance a given location in the county burns in a year: 0.0987% | Likely | Storm Events records in 5 of 30 years, 1996 to 2025 (16.7%) | not shown | modeled | see B1-f | Descriptor from Storm Events, not NRI: the NRI value is the chance at a location in the county, not how often the hazard affects the county. |
| Winter Weather | 7.03 | event-days per year | about 7.03 days per year | Highly likely | event-days in 28 of 30 years, 1996 to 2025 (93.3%) | 106 | 2005-11-12 to 2024-11-12 (19 years) | countywide |
FEMA annualized frequency (modeled) comes from the National Risk Index v1.20 (December 2025). It is not recorded events divided by years, and what it measures depends on the hazard. For most hazards it estimates how often the hazard affects this county each year: it counts events or event-days (drought, heat wave, cold wave, winter weather, ice storm and inland flooding are in days per year; lightning is the number of days per year with a recorded cloud-to-ground strike, from the NOAA Storm Prediction Center daily lightning climatology); it may count events in the surrounding area (hail, strong wind, tornado, hurricane and ice storm use a 49 km grid and buffers) and is averaged over the county's area; and some hazards use a minimum value for places with no recorded event. Earthquake, wildfire and coastal flooding are different: FEMA computes them for each census block and averages them over the county, so the value is the chance (for coastal flooding, the modeled number of floods per year) at a location in the county, which is lower than the chance that the hazard strikes somewhere in the county. Earthquake is the chance of at least minor-damage shaking (U.S. Geological Survey model); wildfire is the chance that a location burns in a large fire (U.S. Forest Service burn probability); coastal flooding comes from FEMA flood zones and NOAA high-tide flooding, so it can be above 1 where high-tide flooding is frequent. Tsunami is the value at the county's most exposed location, from recorded events and modeled return periods. For these four hazards the packet gives no "1 in N years" and takes the descriptor from Storm Events (none for earthquake) unless the value is 1 or more a year. Landslide is a U.S. Geological Survey modeled county rate spread by slope susceptibility. Volcanic activity is the chance that a volcano affecting the county erupts in a year. Drought counts only extreme and exceptional drought (D3 and D4). Source: FEMA, National Risk Index Technical Documentation v1.20, sections 5.2.2 (Table 5), 5.2.3, 7.4, 10.4, 16.5, 17.1, 17.3.1, 17.5, 20.3.1, 21.4, 22.4 and 6 to 23.
Sources
FEMA, FEMA National Risk Index 1.20.0 (December 2025), county and census tract tables, version 1.20.0, pulled 2026-09-28, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_Counties.zip (download, 25 MB), https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip (download, 635 MB)
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
Descriptor scale used in this packet (defined per unit)
| Unit | Descriptor | Definition |
|---|---|---|
| events per year | Highly likely | 1 or more per year |
| events per year | Likely | about once in 1 to 10 years |
| events per year | Possible | about once in 10 to 100 years |
| events per year | Unlikely | less than once in 100 years |
| annual probability | Likely | 10% to under 100% chance in a given year |
| annual probability | Possible | 1% to under 10% chance in a given year |
| annual probability | Unlikely | under 1% chance in a given year |
| event-days (share of years) | Highly likely | event-days recorded in 90% or more of years |
| event-days (share of years) | Likely | event-days recorded in 10% to under 90% of years |
| event-days (share of years) | Possible | event-days recorded in some years but under 10% of years |
| lightning strike-days | Highly likely | cloud-to-ground strikes on 1 or more days per year |
Sources
FEMA, FEMA National Risk Index 1.20.0 (December 2025), county and census tract tables, version 1.20.0, pulled 2026-09-28, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_Counties.zip (download, 25 MB), https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip (download, 635 MB)
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
Intensity bands: historical frequency (Storm Events)
| Hazard | Band | Years | Eventscounty-coded records | Years in period | Events per yearevents / years |
|---|---|---|---|---|---|
| Hail | 1.00-1.99 in | 1996 to 2025 | 22 | 30 | 0.733 |
| Hail | 2.00 in+ | 1996 to 2025 | 2 | 30 | 0.0667 |
| Strong Wind (Thunderstorm Wind records) | 50-64 kt | 1996 to 2025 | 270 | 30 | 9 |
| Strong Wind (Thunderstorm Wind records) | 65 kt+ | 1996 to 2025 | 11 | 30 | 0.367 |
| Strong Wind (Thunderstorm Wind records) | unmeasured or below 50 kt | 1996 to 2025 | 7 | 30 | 0.233 |
| Tornado | EF0-1 | 1996 to 2025 | 9 | 30 | 0.3 |
| Tornado | EF2-3 | 1996 to 2025 | 2 | 30 | 0.0667 |
| Tornado | EF4-5 | 1996 to 2025 | 0 | 30 | 0 |
| Tornado | unrated (EFU) | 1996 to 2025 | 0 | 30 | 0 |
Hail smaller than 1 inch is not counted: on 2010-01-05 the National Weather Service raised its severe-hail threshold from 3/4 inch to 1 inch, so smaller reports became less common after 2009 (NWS Service Change Notice 09-52). NRI hail frequency uses a 0.75 inch threshold.
Source
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
Optional: future conditions. Not a required item in the 2025 FEMA Local Mitigation Planning Policy Guide; some states ask for it. The federal Climate Mapping for Resilience and Adaptation (CMRA) site gives county exposure to future climate conditions.
Supports B1-f: variation across the planning area
Range of census tract risk within the county
| Hazard | Tractsrated of all | Risk score minNRI score, 0 to 100 | Median | Max | Tracts by rating | Note |
|---|---|---|---|---|---|---|
| Avalanche | 0 of 74 | Not Applicable 74 | ||||
| Coastal Flooding | 67 of 74 | 70.3 | 93.4 | 99.9 | Very High 9, Relatively High 13, Relatively Moderate 21, Relatively Low 9, Very Low 15, No Rating 7 | |
| Cold Wave | 74 of 74 | 15.9 | 87.4 | 96.3 | Very High 3, Relatively High 54, Relatively Moderate 16, Very Low 1 | National data give a county-wide or coarse (49 km grid or NWS zone) frequency for this hazard, so they cannot show members' hazard differing. The tract range above mostly reflects where buildings and people are. Confirm locally. |
| Drought | 68 of 74 | 67.0 | 85.1 | 96.0 | Relatively Moderate 18, Relatively Low 30, Very Low 20, No Rating 6 | National data give a county-wide or coarse (49 km grid or NWS zone) frequency for this hazard, so they cannot show members' hazard differing. Agriculture is all of NRI's expected annual loss for this hazard in the county, so the tract range above mostly reflects where crop and livestock value is, not where buildings and people are. Confirm locally. |
| Earthquake | 74 of 74 | 4.0 | 41.8 | 77.2 | Relatively Low 39, Very Low 35 | |
| Hail | 74 of 74 | 1.0 | 26.1 | 84.7 | Relatively Moderate 3, Relatively Low 20, Very Low 51 | National data give a county-wide or coarse (49 km grid or NWS zone) frequency for this hazard, so they cannot show members' hazard differing. Agriculture is 91% of NRI's expected annual loss for this hazard in the county, so the tract range above mostly reflects where crop and livestock value is, not where buildings and people are. Confirm locally. |
| Heat Wave | 74 of 74 | 1.6 | 45.5 | 74.3 | Relatively Moderate 27, Relatively Low 35, Very Low 12 | National data give a county-wide or coarse (49 km grid or NWS zone) frequency for this hazard, so they cannot show members' hazard differing. The tract range above mostly reflects where buildings and people are. Confirm locally. |
| Hurricane | 74 of 74 | 53.5 | 90.6 | 96.9 | Relatively High 44, Relatively Moderate 28, Relatively Low 2 | |
| Ice Storm | 74 of 74 | 2.0 | 56.2 | 76.5 | Relatively Moderate 6, Relatively Low 63, Very Low 5 | National data give a county-wide or coarse (49 km grid or NWS zone) frequency for this hazard, so they cannot show members' hazard differing. The tract range above mostly reflects where buildings and people are. Confirm locally. |
| Inland Flooding | 74 of 74 | 0.4 | 56.1 | 89.3 | Relatively High 8, Relatively Moderate 37, Relatively Low 23, Very Low 6 | |
| Landslide | 74 of 74 | 12.5 | 58.0 | 81.8 | Relatively Low 1, Very Low 73 | |
| Lightning | 74 of 74 | 0.5 | 45.3 | 70.2 | Relatively Moderate 30, Relatively Low 43, Very Low 1 | National data give a county-wide or coarse (49 km grid or NWS zone) frequency for this hazard, so they cannot show members' hazard differing. The tract range above mostly reflects where buildings and people are. Confirm locally. |
| Strong Wind | 74 of 74 | 2.3 | 45.4 | 85.1 | Relatively High 2, Relatively Moderate 24, Relatively Low 47, Very Low 1 | National data give a county-wide or coarse (49 km grid or NWS zone) frequency for this hazard, so they cannot show members' hazard differing. The tract range above mostly reflects where buildings and people are. Confirm locally. |
| Tornado | 74 of 74 | 1.7 | 30.7 | 52.5 | Relatively Low 44, Very Low 30 | |
| Tsunami | 0 of 74 | Insufficient Data 74 | ||||
| Volcanic Activity | 0 of 74 | Not Applicable 74 | ||||
| Wildfire | 74 of 74 | 48.7 | 79.7 | 91.5 | Relatively Moderate 8, Relatively Low 56, Very Low 10 | |
| Winter Weather | 74 of 74 | 16.5 | 83.3 | 93.8 | Relatively High 49, Relatively Moderate 24, Very Low 1 | National data give a county-wide or coarse (49 km grid or NWS zone) frequency for this hazard, so they cannot show members' hazard differing. The tract range above mostly reflects where buildings and people are. Confirm locally. |
Rated tracts only: No Rating (score 0.0), Not Applicable and Insufficient Data tracts are counted but not used for the minimum, median and maximum.
Source
FEMA, FEMA National Risk Index 1.20.0 (December 2025), county and census tract tables, version 1.20.0, pulled 2026-09-28, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_Counties.zip (download, 25 MB), https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip (download, 635 MB)
Per-member block (Starter, confirm locally)
| Member | Type | Plan status | Repetitive lossFMA RL and SRL (44 CFR 77.2); repeat-flood, any definition | Public Assistance matchedfederal share obligated, nominal dollars | Event records naming this placeall years; since the member's plan | Notes |
|---|---|---|---|---|---|---|
| Sussex County | County | Approved, expires 2028-01-02 | FMA RL 2, SRL 14; any 145 | $213,298.91 | 0; 0 | |
| Bethany Beach town | Town | Approved, expires 2028-01-02 | FMA RL 0, SRL 2; any 49 | $39,005.56 | 20; 3 | |
| Bethel town | Town | No approved plan on record | FMA RL 0, SRL 0; any 0 | none found | 8; no approved plan | |
| Blades town | Town | Approved, expires 2028-01-02 | FMA RL 0, SRL 0; any 0 | $6,204.68 | 24; 2 | |
| Bridgeville town | Town | Approved, expires 2028-01-02 | FMA RL 0, SRL 0; any 0 | $42,744.43 | 32; 6 | |
| Dagsboro town | Town | No approved plan on record | FMA RL 0, SRL 0; any 0 | none found | 15; no approved plan | |
| Delmar town | Town | Approved, expires 2028-01-02 | FMA RL 0, SRL 0; any 0 | $11,989.60 | 9; 0 | |
| Dewey Beach town | Town | Approved, expires 2028-01-02 | FMA RL 0, SRL 5; any 32 | $34,016.65 | 31; 3 | |
| Ellendale town | Town | Approved, expires 2028-01-02 | FMA RL 0, SRL 0; any 0 | none found | 13; 2 | |
| Fenwick Island town | Town | Approved, expires 2028-01-02 | FMA RL 2, SRL 1; any 9 | $59,022.10 | 0; 0 | |
| Frankford town | Town | Approved, expires 2028-01-02 | FMA RL 0, SRL 0; any 0 | none found | 11; 3 | |
| Georgetown town | Town | Approved, expires 2028-01-02 | FMA RL 0, SRL 0; any 0 | $47,978.17 | 34; 1 | |
| Greenwood town | Town | No approved plan on record | FMA RL 0, SRL 0; any 0 | $6,046.45 | 21; no approved plan | |
| Henlopen Acres town | Town | Approved, expires 2028-01-02 | FMA RL 0, SRL 0; any 0 | $25,476.40 | 2; 0 | |
| Laurel town | Town | Approved, expires 2028-01-02 | FMA RL 0, SRL 0; any 0 | $101,168.53 | 28; 5 | |
| Lewes city | City | Approved, expires 2028-01-02 | FMA RL 0, SRL 0; any 15 | $99,164.83 | 23; 1 | |
| Milford city | City | Expired on 2026-04-19 | FMA RL 0, SRL 2; any 7 | $180,301.61 | 0; 0 | Whole community, including the part in Kent County; in-county portion (county table): FMA RL 0, FMA SRL 0, NFIP RL 3, NFIP SRL 0, any category 3. |
| Millsboro town | Town | Approved, expires 2028-01-02 | FMA RL 0, SRL 0; any 1 | $25,204.10 | 19; 2 | |
| Millville town | Town | Approved, expires 2028-01-02 | FMA RL 0, SRL 0; any 0 | none found | 9; 1 | |
| Milton town | Town | Approved, expires 2028-01-02 | FMA RL 0, SRL 1; any 1 | $29,847.54 | 15; 1 | |
| Ocean View town | Town | Approved, expires 2028-01-02 | FMA RL 0, SRL 0; any 1 | $31,058.20 | 13; 1 | |
| Rehoboth Beach city | City | Approved, expires 2028-01-02 | FMA RL 0, SRL 1; any 8 | $1,112,733.15 | 13; 0 | |
| Seaford city | City | Approved, expires 2028-01-02 | FMA RL 0, SRL 0; any 0 | $202,356.16 | 20; 1 | |
| Selbyville town | Town | Approved, expires 2028-01-02 | FMA RL 0, SRL 0; any 0 | $33,207.43 | 5; 0 | |
| Slaughter Beach town | Town | Approved, expires 2028-01-02 | FMA RL 0, SRL 0; any 2 | $9,856.09 | 6; 0 | |
| South Bethany town | Town | Approved, expires 2028-01-02 | FMA RL 0, SRL 2; any 41 | $77,735.45 | 0; 0 |
Member rows are whole NFIP communities and need not add up to the county total: a community that extends into another county is counted in full on each member row, while the county table counts only its part in this county.
School districts and special districts get a plan clock row only.
Sources
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/NfipMultipleLossProperties (API)
FEMA, OpenFEMA PublicAssistanceFundedProjectsSummaries v1, version 2026-09-26T151157Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/PublicAssistanceFundedProjectsSummaries (API)
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
Supports B2-a and B2-b: assets and impacts
Local data required
County-level starter. The plan must describe impacts for each participant and its own assets.
- Critical facilities and lifelines per hazard
- A problem statement per participant per hazard
- Changes in development in hazard-prone areas since the last approval, or a statement of none (E1-a)
- Future assets
County-level starter: exposure, expected annual loss and damage since the plan
| Hazard | Building exposuremodeled dollars | Agriculture exposuremodeled dollars | Population exposedpeople | EAL buildingsmodeled dollars per year | EAL agriculturemodeled dollars per year | EAL population equivalencestatistical value of life and injury, $13.7M per life, not property damage | EAL as % of exposurebuildings; agriculture where noted | Storm Events damage since 2023-01-03county-coded records, property plus crops, nominal dollars | Zone-level damage since planproperty plus crops, reported for the zone | Public Assistance since plannominal dollars; see note | Note |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Avalanche | Not Applicable in NRI for this county | ||||||||||
| Coastal Flooding | $10,806,278,949 | 20,444 | $14,125,960 | $46,980 | 0.131% | $0 | |||||
| Cold Wave | $74,497,727,033 | $1,303,773,481 | 237,214 | $3,262 | $53,181 | $16,751,057 | under 0.0001% | ||||
| Drought | $192,148,649 | $1,060,189 | 0.552% (agriculture) | NRI has no building exposure for this hazard; agriculture shown | |||||||
| Earthquake | $124,619,323,001 | 237,378 | $1,294,797 | $227,760 | 0.00104% | ||||||
| Hail | $74,497,727,033 | $1,303,773,481 | 237,214 | $26,314 | $279,024 | $353 | under 0.0001% | $0 | |||
| Heat Wave | $74,497,727,033 | $1,303,773,481 | 237,214 | under $1 | $4,172 | $2,307,003 | under 0.0001% | ||||
| Hurricane | $74,492,829,350 | $1,303,735,830 | 237,208 | $25,442,157 | $9,355,258 | $514,546 | 0.0342% | ||||
| Ice Storm | $73,095,713,845 | 233,869 | $323,527 | $61,934 | 0.000443% | ||||||
| Inland Flooding | $74,162,597,140 | $73,460,542 | 19,816 | $40,254,893 | $1,798,764 | $554,403 | n/a (see note) | $0 | NRI counts the full building value of any census block with some flood loss; this is not the value of buildings in the floodplain. Use local FIRM overlays for B2-a/B2-b. EAL as % of exposure: n/a. | ||
| Landslide | $192,591,385 | 516 | $1,105 | $3 | 0.000574% | ||||||
| Lightning | $74,497,727,033 | 237,214 | $226,726 | $437,797 | 0.000304% | $10,000 | |||||
| Strong Wind | $74,497,727,033 | $1,303,773,481 | 237,214 | $540,151 | $53,564 | $701,726 | 0.000725% | $30,000 | |||
| Tornado | $74,497,727,033 | $1,303,773,481 | 237,214 | $842,306 | $7,716 | $739,863 | 0.00113% | $0 | |||
| Tsunami | NRI publishes no building exposure for this county | ||||||||||
| Volcanic Activity | Not Applicable in NRI for this county | ||||||||||
| Wildfire | $5,864,866,086 | $241,950,892 | 37,528 | $472,767 | $1,916 | $63,389 | 0.00806% | ||||
| Winter Weather | $74,497,727,033 | $1,303,773,481 | 237,214 | $280,076 | $276 | $446,463 | 0.000376% | $0 | $139,557.68 |
Totals since 2023-01-03 (Storm Events through 2026-06-30): 58 county-coded records, 17 with a damage value recorded (including $0), $40,000; 32 zone-level records, 20 with a damage value recorded (including $0), $0 reported for the zone; Public Assistance on counted declarations $139,557.68 (1 declaration, 1 with PA).
Total = buildings + agriculture + population equivalence; FEMA values each expected death (or 10 injuries) at $13.7 million (2024 dollars).
FEMA does not split Public Assistance by hazard. A declaration mapped to several hazards is listed under each of them with its full amount, so the per-hazard column must not be added up; the unit total counts each declaration once.
Dollars are nominal (as reported), labeled with the year; not adjusted for inflation.
Sources
FEMA, FEMA National Risk Index 1.20.0 (December 2025), county and census tract tables, version 1.20.0, pulled 2026-09-28, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_Counties.zip (download, 25 MB), https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip (download, 635 MB)
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
NOAA National Weather Service, NWS county-public forecast zones correlation file, version bp03mr20 to bp16ap26 (11 files; newest bp16ap26), pulled 2026-09-28, https://www.weather.gov/gis/ZoneCounty
FEMA, OpenFEMA DisasterDeclarationsSummaries v2, version 2026-09-27T010817Z, pulled 2026-09-28, https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries (API)
FEMA, OpenFEMA PublicAssistanceFundedProjectsSummaries v1, version 2026-09-26T151157Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/PublicAssistanceFundedProjectsSummaries (API)
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
Supports B2-a: context
County context
| Measure | Value |
|---|---|
| Population | 237,214 |
| Building value (total, not at risk) | $74,497,727,033 |
| Agriculture value (total, not at risk) | $1,303,773,481 |
| NRI risk rating (all hazards) | Relatively Moderate |
| Expected annual loss, buildings and agriculture, all hazards | $96,448,099 |
| Expected annual loss, population equivalence, all hazards (NRI values each statistical life at $13.7M; a modeled value of expected deaths and injuries, not property damage) | $22,853,277 |
| Social vulnerability rating | Relatively High |
| Community resilience rating | Relatively Moderate |
| NRI version | December 2025 |
FEMA's all-hazard expected annual loss total adds buildings, agriculture and population equivalence; the two parts are shown separately so the property figure is not read as including the statistical value of life.
Source
FEMA, FEMA National Risk Index 1.20.0 (December 2025), county and census tract tables, version 1.20.0, pulled 2026-09-28, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_Counties.zip (download, 25 MB), https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip (download, 635 MB)
Supports B2-c: repetitive loss
Repetitive loss in this county, both definitions
| Definition | Properties | Severe repetitive loss | Properties |
|---|---|---|---|
| Repetitive loss, FMA definition (44 CFR 77.2) | 4 | Severe repetitive loss, FMA definition (44 CFR 77.2) | 26 |
| Repetitive loss, NFIP insurance definition | 304 | Severe repetitive loss, NFIP insurance definition | 23 |
Your state NFIP coordinator's list may use the NFIP insurance definition, so its counts can be higher.
Sources
FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/NfipMultipleLossProperties (API)
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
Repeat-flood properties: county and state-level rows
| Scope | RL, FMAproperties | SRL, FMAproperties | RL, NFIPproperties | SRL, NFIPproperties | Any categoryproperties | Mitigatedproperties | Currently insuredproperties |
|---|---|---|---|---|---|---|---|
| County total | 4 | 26 | 304 | 23 | 307 | 2 | 107 |
| SUSSEX COUNTY* | 2 | 14 | 144 | 13 | 145 | 1 | 46 |
| LEWES, CITY OF | 0 | 0 | 15 | 0 | 15 | 0 | 12 |
| MILFORD, CITY OF | 0 | 0 | 3 | 0 | 3 | 0 | 0 |
| MILLSBORO, TOWN OF | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
| MILTON, TOWN OF | 0 | 1 | 1 | 1 | 1 | 0 | 1 |
| OCEAN VIEW, TOWN OF | 0 | 0 | 1 | 0 | 1 | 0 | 1 |
| SLAUGHTER BEACH, TOWN OF | 0 | 0 | 2 | 0 | 2 | 0 | 1 |
| SOUTH BETHANY, TOWN OF | 0 | 2 | 40 | 1 | 41 | 1 | 10 |
| DEWEY BEACH, TOWN OF | 0 | 5 | 32 | 5 | 32 | 0 | 10 |
| BETHANY BEACH, TOWN OF | 0 | 2 | 49 | 2 | 49 | 0 | 21 |
| FENWICK ISLAND, TOWN OF | 2 | 1 | 8 | 0 | 9 | 0 | 2 |
| REHOBOTH BEACH, CITY OF | 0 | 1 | 8 | 1 | 8 | 0 | 3 |
| State level, not in this county: county not reported | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
Sources
FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/NfipMultipleLossProperties (API)
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
Repeat-flood properties by plan member (NFIP community)
| Member | NFIP community ID | RL, FMAproperties | SRL, FMAproperties | RL, NFIPproperties | SRL, NFIPproperties | Any categoryproperties | Mitigatedproperties | Currently insuredproperties | Note |
|---|---|---|---|---|---|---|---|---|---|
| Sussex County | 100029 | 2 | 14 | 144 | 13 | 145 | 1 | 46 | |
| Bethany Beach town | 105083 | 0 | 2 | 49 | 2 | 49 | 0 | 21 | |
| Bethel town | 100055 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Blades town | 100031 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bridgeville town | 100032 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Dagsboro town | 100033 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Delmar town | 100059 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Dewey Beach town | 100056 | 0 | 5 | 32 | 5 | 32 | 0 | 10 | |
| Ellendale town | 100060 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Fenwick Island town | 105084 | 2 | 1 | 8 | 0 | 9 | 0 | 2 | |
| Frankford town | 100037 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Georgetown town | 100062 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Greenwood town | 100039 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Henlopen Acres town | 100053 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Laurel town | 100040 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Lewes city | 100041 | 0 | 0 | 15 | 0 | 15 | 0 | 12 | |
| Milford city | 100042 | 0 | 2 | 7 | 2 | 7 | 0 | 1 | Whole community, including the part in Kent County; in-county portion (county table): FMA RL 0, FMA SRL 0, NFIP RL 3, NFIP SRL 0, any category 3. |
| Millsboro town | 100043 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | |
| Millville town | 100044 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Milton town | 100045 | 0 | 1 | 1 | 1 | 1 | 0 | 1 | |
| Ocean View town | 100046 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | |
| Rehoboth Beach city | 105086 | 0 | 1 | 8 | 1 | 8 | 0 | 3 | |
| Seaford city | 100048 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Selbyville town | 100038 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Slaughter Beach town | 100050 | 0 | 0 | 2 | 0 | 2 | 0 | 1 | |
| South Bethany town | 100051 | 0 | 2 | 40 | 1 | 41 | 1 | 10 |
Per-member types: XLSX sheet 'B2-c Members'.
Member rows are whole NFIP communities and need not add up to the county total: a community that extends into another county is counted in full on each member row, while the county table counts only its part in this county.
Sources
FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/NfipMultipleLossProperties (API)
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
County repeat-flood properties by occupancy group
| Occupancy group | RL, FMAproperties | SRL, FMAproperties | RL, NFIPproperties | SRL, NFIPproperties | Any categoryproperties | Mitigatedproperties | Currently insuredproperties |
|---|---|---|---|---|---|---|---|
| single-family residential | 3 | 17 | 234 | 14 | 237 | 2 | 81 |
| 2 to 4 unit residential | 1 | 2 | 17 | 2 | 17 | 0 | 3 |
| other residential | 0 | 5 | 39 | 5 | 39 | 0 | 20 |
| non-residential | 0 | 2 | 14 | 2 | 14 | 0 | 3 |
| not reported | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Institutional properties cannot be separated in this data: FEMA's occupancy groups have no institutional class, so they fall in non-residential or other residential in the table by occupancy group.
Sources
FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/NfipMultipleLossProperties (API)
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
FMA RL and FMA SRL are the Flood Mitigation Assistance definitions (44 CFR 77.2), the ones the FEMA Local Mitigation Planning Policy Guide cites; OpenFEMA's fmaRl field description omits the Increased Cost of Compliance clause of 44 CFR 77.2(i). NFIP repetitive loss (FEMA insurance definition, nfipRl) is 2 or more claims over $1,000 in 10 years and can drop to false when a property is mitigated. Also shown: NFIP severe repetitive loss, any category, mitigated and currently insured.
Your state NFIP coordinator's list may use the NFIP insurance definition, so its counts can be higher.
Counts are aggregates of FEMA's public NFIP Multiple Loss Properties file (as of 2026-08-02). No property is identified. County assignment is FEMA's geocode.
Counts may differ from your state NFIP coordinator's list, which is the source the Handbook names.
In this county 1 property is FMA repetitive loss but not NFIP repetitive loss, and 301 properties are NFIP repetitive loss but not FMA repetitive loss.
Exact counts; no count suppression.
Sources
Every table above lists its own sources. The full list, for the plan's bibliography (FEMA review item A4-a):
- FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
- FEMA, OpenFEMA DisasterDeclarationsSummaries v2, version 2026-09-27T010817Z, pulled 2026-09-28, https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries (API)
- FEMA, OpenFEMA PublicAssistanceFundedProjectsSummaries v1, version 2026-09-26T151157Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/PublicAssistanceFundedProjectsSummaries (API)
- FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/NfipMultipleLossProperties (API)
- FEMA, FEMA National Risk Index 1.20.0 (December 2025), county and census tract tables, version 1.20.0, pulled 2026-09-28, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_Counties.zip (download, 25 MB), https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip (download, 635 MB)
- NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
- NOAA National Weather Service, NWS county-public forecast zones correlation file, version bp03mr20 to bp16ap26 (11 files; newest bp16ap26), pulled 2026-09-28, https://www.weather.gov/gis/ZoneCounty
- U.S. Census Bureau, Census 2024 Gazetteer, 2020 place by county, CT county-to-cousub crosswalk, version 2024-gazetteer, pulled 2026-09-28, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_counties_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_cousubs_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_place_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_unsd_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_elsd_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_scsd_national.zip, https://www2.census.gov/geo/docs/reference/codes2020/national_place_by_county2020.txt, https://www2.census.gov/geo/docs/reference/ct_change/ct_cou_to_cousub_crosswalk.xlsx
OpenFEMA disclaimer
This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Hazard Plain is an independent product built from public federal data. It is not a FEMA document and is not reviewed or endorsed by FEMA or any state agency.
Reuse, citation and corrections
Reuse and citation: Hazard Plain text and tables are licensed under Creative Commons Attribution 4.0 International (CC BY 4.0, https://creativecommons.org/licenses/by/4.0/); credit Hazard Plain and the release. The underlying federal data are public domain; OpenFEMA data are also subject to the OpenFEMA terms and conditions.
Cite this: Hazard Plain (2026). Sussex County, DE: risk-assessment baseline packet, release 2026-10 (data as of 2026-09-28; County area 10005). Preview: automated baseline. Built from FEMA OpenFEMA, the FEMA National Risk Index and NOAA NCEI Storm Events; source versions in the packet's Sources list.
Corrections: to report an error, name the packet, the table and what your records show. Contact: to be added
Hazard Plain release 2026-10. As of 2026-09-28; Storm Events data through 2026-06-30. File hazard-plain_2026-10_DE_10005. Preview: automated baseline.