Summary
Plan status as of 2026-09-30: Approved, expires 2028-09-12. Plan: Mason County Hazard Mitigation Plan (FEMA plan 109120), approved 2023-09-13.
Since the plan was approved on 2023-09-13: 3 new hazard declarations (2 incidents): DR-4775-WA (Severe Winter Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides), EM-3629-WA (Severe Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides), DR-4906-WA (Severe Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides).
NOAA Storm Events records since that date: 4 records (data through 2026-06-30).
Highest expected annual loss (FEMA National Risk Index, modeled total; see B1-a): Earthquake ($26,332,449 a year), Inland Flooding ($14,807,871) and Coastal Flooding ($1,276,639).
Repetitive-loss flood properties now: FMA RL 1, SRL 4 (44 CFR 77.2); any definition: 27.
The tables that follow are organized by the items of FEMA's Local Mitigation Plan Review Tool, Element B (B1-a to B2-c); each heading says which item its tables support.
Plan clock
- Status:
- Approved, expires 2028-09-12
- Plan:
- Mason County Hazard Mitigation Plan (FEMA plan 109120)
- Approved:
- 2023-09-13
- Days to expiry:
- 713
What changed since your last plan (approved 2023-09-13)
- New federal declarations:
- 3 new hazard declarations (2 incidents): DR-4775-WA (Severe Winter Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides), EM-3629-WA (Severe Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides), DR-4906-WA (Severe Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides)
- Storm Events records since approval:
- 4 records (data through 2026-06-30)
- Repetitive loss now:
- FMA RL 1, SRL 4 (44 CFR 77.2); any definition: 27
- Repeat-flood change:
- this release sets the baseline count.
Sources: 1, 2, 4, 6 (numbered list at the end)
Plan status for every jurisdiction listed in this county
Source: 1
| Jurisdiction | Type | Status | Plan | Approved | Expires | Days to expirynegative = days since expiry |
|---|---|---|---|---|---|---|
| Mason County | County | Approved, expires 2028-09-12 | Mason County Hazard Mitigation Plan (FEMA plan 109120) | 2023-09-13 | 2028-09-12 | 713 |
| Shelton city | City | Approved, expires 2028-09-12 | Mason County Hazard Mitigation Plan (FEMA plan 109120) | 2023-09-13 | 2028-09-12 | 713 |
| Central Mason Fire & EMS | Fire/EMS District | Approved, expires 2028-09-12 | Mason County Hazard Mitigation Plan (FEMA plan 109120) | 2023-09-13 | 2028-09-12 | 713 |
| Fire District #16 | Fire/EMS District | Approved, expires 2028-09-12 | Mason County Hazard Mitigation Plan (FEMA plan 109120) | 2023-09-13 | 2028-09-12 | 713 |
| Mason County Fire District #4 | Fire/EMS District | Approved, expires 2028-09-12 | Mason County Hazard Mitigation Plan (FEMA plan 109120) | 2023-09-13 | 2028-09-12 | 713 |
| PUD #1 | Electric/Power Authority | Approved, expires 2028-09-12 | Mason County Hazard Mitigation Plan (FEMA plan 109120) | 2023-09-13 | 2028-09-12 | 713 |
| PUD #3 | Electric/Power Authority | Approved, expires 2028-09-12 | Mason County Hazard Mitigation Plan (FEMA plan 109120) | 2023-09-13 | 2028-09-12 | 713 |
State plan status and tribal plans in this state: see the state page.
Supports FEMA checklist item B1-a: hazard identification
Hazards NRI does not cover (local data needed)
- 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)
Sources: 5, 6
| Rank by EAL | Hazard | NRI risk rating | EAL rating | EAL buildingsmodeled dollars per year | EAL agriculturemodeled dollars per year | Cost of expected deaths and injuriesFEMA's dollar value per year, not property damage | EAL total (see note)modeled dollars per year | Storm Events records, 1996 to 2026-06-30count | Why this hazard can be left outNRI Not Applicable, no declaration and no Storm Events record since 1996 | Storm Events coverage note |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Earthquake | Relatively Moderate | Relatively Moderate | $18,360,232 | n/a | $7,972,216 | $26,332,449 | Storm Events does not record earthquakes. | ||
| 2 | Inland Flooding | Relatively Moderate | Relatively Low | $14,760,445 | $5,581 | $41,845 | $14,807,871 | 5 | ||
| 3 | Coastal Flooding | Relatively Moderate | Relatively Moderate | $1,181,997 | n/a | $94,642 | $1,276,639 | 1 | ||
| 4 | Heat Wave | Relatively Low | Relatively Low | $177 | $5,969 | $647,321 | $653,467 | 3 | ||
| 5 | Landslide | Relatively High | Relatively Moderate | $10,894 | n/a | $489,286 | $500,180 | 4 | ||
| 6 | Tsunami | Very Low | Very Low | $85,988 | n/a | $347,131 | $433,119 | 0 | No recorded events in Storm Events since 1996 (data through 2026-06-30). | |
| 7 | Tornado | Very Low | Very Low | $29,695 | $152 | $63,718 | $93,566 | 1 | ||
| 8 | Lightning | Very Low | Very Low | $5,282 | n/a | $48,929 | $54,211 | 2 | ||
| 9 | Winter Weather | Relatively Low | Relatively Low | $7,398 | $436 | $38,952 | $46,786 | 67 | ||
| 10 | Strong Wind | Very Low | Very Low | $25,852 | $2 | $7,536 | $33,390 | 32 | Includes 21 High Wind and 11 Strong Wind records (NOAA non-thunderstorm wind types, outside NRI's Strong Wind definition). | |
| 11 | Wildfire | Very Low | Very Low | $24,600 | $2 | $1,264 | $25,866 | 2 | ||
| 12 | Ice Storm | Very Low | Very Low | $16,170 | n/a | $3,297 | $19,468 | 1 | ||
| 13 | Hail | Very Low | Very Low | $2,869 | $325 | $646 | $3,839 | 0 | No recorded events in Storm Events since 1996 (data through 2026-06-30). | |
| 14 | Avalanche | Very Low | Very Low | $4 | n/a | $221 | $225 | 0 | No recorded events in Storm Events since 1996 (data through 2026-06-30). | |
| 15 | Volcanic Activity | Very Low | Very Low | under $1 | n/a | $8 | $8 | 0 | Declared 1 time; no Storm Events record of this type. | |
| 16 | Drought | Very Low | Very Low | n/a | $5 | n/a | $5 | 0 | No recorded events in Storm Events since 1996 (data through 2026-06-30). | |
| 17 | Cold Wave | No Rating | No Expected Annual Losses | $0 | $0 | $0 | $0 | 0 | No recorded events in Storm Events since 1996 (data through 2026-06-30). | |
| Hurricane | Not Applicable | Not Applicable | 0 | NRI rates hurricane Not Applicable for this county, and no counted federal declaration for this county names it (EM-3227-WA names it but is not counted as a local occurrence; see B1-d). | No recorded events in Storm Events since 1996 (data through 2026-06-30). |
Total = buildings + agriculture + population equivalence; FEMA values each expected death (or 10 injuries) at $13.7 million (2024 dollars).
NRI risk rating combines expected annual loss with social vulnerability and community resilience; EAL rating rates expected annual loss alone. Both compare this county with all U.S. counties.
Local data needed: state and local tsunami and volcanic activity records (Storm Events records these hazards only in part).
The state hazard mitigation plan also lists hazards for this county; FEMA asks the plan to explain any hazard it leaves out.
Supports FEMA checklist item B1-b: hazard location
Affects the whole county (national data give no location within it): Cold Wave, Drought, Hail, Heat Wave, Ice Storm, Lightning, Strong Wind and Winter Weather.
Coastal Flooding and 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.
Hazards that vary within the county: highest-rated census tracts
Source: 5
| Hazard | Highest-rated census tractsNRI risk rating, score 0 to 100 |
|---|---|
| Avalanche | tract 9602.01 (Very Low, 29.5); tract 9613 (Very Low, 28.5); tract 9400 (Very Low, 27.2) |
| Earthquake | tract 9608 (Very High, 99.4); tract 9604.01 (Very High, 98.4); tract 9605 (Relatively High, 97.0) |
| Hurricane | no tract has a National Risk Index rating for this hazard |
| Landslide | tract 9601 (Relatively High, 99.8); tract 9603.01 (Relatively High, 99.6); tract 9613 (Relatively High, 99.4) |
| Tornado | tract 9604.01 (Very Low, 24.9); tract 9605 (Very Low, 24.3); tract 9608 (Very Low, 20.4) |
| Tsunami | tract 9605 (Relatively Moderate, 80.5); tract 9604.02 (Relatively Low, 73.8); tract 9603.02 (Relatively Low, 63.2) |
| Volcanic Activity | tract 9611.01 (Very Low, 81.2); tract 9604.03 (Very Low, 76.5); tract 9610 (Very Low, 68.2) |
| Wildfire | tract 9605 (Relatively Low, 80.8); tract 9603.01 (Relatively Low, 77.8); tract 9602.02 (Relatively Low, 76.1) |
Up to 3 census tracts per hazard, highest National Risk Index rating first, then highest score; a tract number is the Census tract number (for example 9602.01 is Census Tract 9602.01). FEMA's Resilience Analysis and Planning Tool maps the National Risk Index for every tract: https://www.fema.gov/emergency-managers/practitioners/resilience-analysis-and-planning-tool
Supports FEMA checklist item B1-c: hazard extent
Extent: scale, observed range and worst recorded event per hazard
Sources: 6, 7
| Hazard | Scale | Recordscount and years | Observed range | Worst recorded event | Most damaging (when different) | How it applies to jurisdictions | Note |
|---|---|---|---|---|---|---|---|
| Avalanche | none (count and damage only) | 0 | Physical measure: in event narratives only (local data needed). | ||||
| Coastal Flood, Storm Surge/Tide | none in data (flood depth: FIRM) | 1 record, 2012 (1 zone-level) | Coastal Flood, 2012-12-17, $2,000 property; $0 crops (2012 dollars); NWS zone WAZ511 | Countywide (zone-level records). | Flood depth: see the FEMA Flood Insurance Rate Map. | ||
| Cold/Wind Chill, Extreme Cold/Wind Chill | wind chill | 0 | Wind chill: in event narratives only (local data needed). | ||||
| Frost/Freeze (outside NRI's Cold Wave definition) | crop damage | 0 | Temperature: in event narratives only (local data needed). | ||||
| Drought | U.S. Drought Monitor scale (D0 to D4) | 0 | 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 | Storm Events does not record earthquakes; the USGS earthquake catalog is the source. | ||||
| Hail | hail size (inches) | 1 record, 1985 | 1 in; 1 with a recorded value | 1 in hail, 1985-10-22 | No event record names a jurisdiction in the plan. | ||
| Excessive Heat, Heat | heat index (in event narratives) | 3 records, 2021 to 2023 (3 zone-level) | 1 day to 5 days (median 3 days); 3 with a recorded value | 5 consecutive days, 2023-05-12 to 2023-05-16, zone-level | Countywide (zone-level records). | Heat index: in event narratives only (local data needed). | |
| Hurricane, Tropical Storm, Tropical Depression | Saffir-Simpson | 0 | Storm Events files every zone of a storm's episode under the storm's type; flooding from the storm is filed as Flood or Flash Flood records. | ||||
| Ice Storm | Sperry-Piltz ice scale (local data) | 1 record, 2012 (1 zone-level) | No damage reported in 1 record. | Countywide (zone-level records). | Ice thickness: in event narratives only (local data needed). | ||
| Flash Flood, Flood, Lakeshore Flood | damage and flood days (flood depth: FIRM) | 5 records, 2007 to 2021 | Flood, 2009-01-07, $900,000 property; $0 crops (2009 dollars) | Event records naming jurisdictions in the plan: Shelton city (1 record). | Flood depth: see the FEMA Flood Insurance Rate Map. Storm Events damage is often $0 or blank for floods, major ones included; FEMA Public Assistance by declaration (B1-d) shows which floods cost the most. | ||
| Debris Flow | none (count and damage only) | 4 records, 2006 to 2011 (4 zone-level) | Debris Flow, 2007-12-03, $500,000 property; $0 crops (2007 dollars), 1 direct death (reported for the zone); NWS zone WAZ511 | Countywide (zone-level records). | Physical measure: in event narratives only (local data needed). | ||
| Lightning | annualized frequency (the measure FEMA's Local Mitigation Planning Handbook names) | 2 records, 1997 to 2013 | Lightning, 1997-07-05, $70,000 property; crops not reported (1997 dollars) | No event record names a jurisdiction in the plan. | Storm Events lists lightning with damage or casualties; physical measure in event narratives only (local data needed). | ||
| High Wind and Strong Wind (outside NRI's Strong Wind definition) | wind speed (kt and mph) | 32 records, 2006 to 2021 (32 zone-level) | 35 kt (40 mph) to 93 kt (107 mph) (median 48.5 kt (56 mph)); 32 with a recorded value | 93 kt (107 mph) measured gust, High Wind, 2009-11-18; NWS zone WAZ513 | High Wind, 2006-12-14, $2,800,000 property; $0 crops, reported for the zone (2006 dollars) | Countywide (zone-level records). | |
| Thunderstorm Wind | wind speed (kt and mph) | 0 | |||||
| Tornado | Enhanced Fujita (Fujita before Feb 2007) | 1 record, 2019 | F/EF1; 1 with a recorded value | EF1 tornado, 2019-10-18, 0.68 mi within this county, 90 yd wide, $150,000 property; $0 crops (2019 dollars) | No event record names a jurisdiction in the plan. | Before 1996 a tornado is listed once, under the county where it began, with its whole path's rating and length; from 1996 on, each county lists its own segment. Length is not used to rank tornadoes (see Methods). | |
| Tsunami | none (count and damage only) | 0 | Physical measure: in event narratives only (local data needed). | ||||
| Volcanic Ash, Volcanic Ashfall | Volcanic Explosivity Index (local data) | 0 | Physical measure: in event narratives only (local data needed). | ||||
| Wildfire | acres burned (local data) | 2 records, 2012 to 2015 (2 zone-level) | Wildfire, 2012-10-04, property not reported; $1,100,000 crops (2012 dollars); NWS zone WAZ511 | Countywide (zone-level records). | Acres burned: in event narratives only (local data needed). | ||
| Winter Storm, Heavy Snow, Blizzard, Lake-Effect Snow, Winter Weather, Sleet | none in data (snowfall: local data) | 67 records, 2006 to 2025 (67 zone-level) | Heavy Snow, 2008-12-21, $600,000 property; $0 crops (2008 dollars); NWS zone WAZ511 | Countywide (zone-level records). | Snow depth: in event narratives only (local data needed). |
Storm Events records are more complete after 1996; before 1996 only Tornado (from 1950), Hail and Thunderstorm Wind (from 1955) exist. Zone-level records whose zone no NWS zone-county file places in this county (mostly before 2020) are not counted here (the Methods page explains the zone matching).
Dollars are nominal (as reported), labeled with the year; not adjusted for inflation.
Supports FEMA checklist item B1-d: previous occurrences
Federal declarations for this county: 32 declarations covering 28 separate hazard incidents counted in this packet (declarations for the same incident count once; non-natural and evacuation-only declarations are not counted).
Federal disaster declarations for this county
Sources: 1, 2, 3
| Declared | Incident began | FEMA number | Type | Title | Mapped hazard | County Public Assistancefederal share obligated, nominal dollars | Flags | Notes |
|---|---|---|---|---|---|---|---|---|
| 2026-04-07 | 2025-12-05 | DR-4906-WA | Major disaster | Severe Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides | Inland Flooding (primary); also designated: Landslide, Strong Wind | $21,139.41 | new since last plan; within last 5 years | |
| 2025-12-12 | 2025-12-09 | EM-3629-WA | Emergency | Severe Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides | Inland Flooding (primary); also designated: Landslide, Strong Wind | no Public Assistance recorded | new since last plan; within last 5 years | same incident as DR-4906 |
| 2024-04-28 | 2024-01-05 | DR-4775-WA | Major disaster | Severe Winter Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides | Inland Flooding; Landslide; Strong Wind; Winter Weather | $811,465.35 | new since last plan; within last 5 years | |
| 2023-07-05 | 2023-07-04 | FM-5468-WA | Fire management | McEwan Fire | Wildfire | no Public Assistance recorded | in the 12 months before plan approval; within last 5 years | |
| 2022-03-29 | 2021-12-26 | DR-4650-WA | Major disaster | Severe Winter Storms, Snowstorms, Straight-Line Winds, Flooding | Inland Flooding (primary); also designated: Strong Wind, Winter Weather | $1,212,247.94 | within last 5 years | |
| 2021-04-08 | 2020-12-29 | DR-4593-WA | Major disaster | Severe Winter Storm, Straight-Line Winds, Flooding, Landslides, and Mudslides | Inland Flooding; Landslide; Strong Wind; Winter Weather | $379,021.60 | ||
| 2020-04-23 | 2020-01-20 | DR-4539-WA | Major disaster | Severe Storms, Flooding, Landslides, and Mudslides | Inland Flooding (primary); also designated: Landslide | $475,508.69 | ||
| 2020-03-22 | 2020-01-20 | DR-4481-WA | Major disaster | COVID-19 Pandemic | Non-natural, not counted | $1,479,283.26 | ||
| 2020-03-13 | 2020-01-20 | EM-3427-WA | Emergency | COVID-19 | Non-natural, not counted | no Public Assistance recorded | same incident as DR-4481 | |
| 2019-03-04 | 2018-12-10 | DR-4418-WA | Major disaster | Severe Winter Storms, Straight-Line Winds, Flooding, Landslides, Mudslides, Tornado | Inland Flooding; Landslide; Strong Wind; Tornado; Winter Weather | $243,912.75 | ||
| 2016-02-02 | 2015-12-01 | DR-4253-WA | Major disaster | Severe Winter Storm, Straight-Line Winds, Flooding, Landslides, Mudslides, and a T | Inland Flooding (primary); also designated: Landslide, Strong Wind, Winter Weather | $425,012.93 | ||
| 2016-01-15 | 2015-11-12 | DR-4249-WA | Major disaster | Severe Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides | Inland Flooding; Landslide; Strong Wind | $349,126.39 | ||
| 2012-03-05 | 2012-01-14 | DR-4056-WA | Major disaster | Severe Winter Storm, Flooding, Landslides, and Mudslides | Inland Flooding; Landslide; Winter Weather | $428,114.57 | ||
| 2009-03-02 | 2008-12-12 | DR-1825-WA | Major disaster | Severe Winter Storm and Record and Near Record Snow | Winter Weather | $264,414.13 | ||
| 2009-01-30 | 2009-01-06 | DR-1817-WA | Major disaster | Severe Winter Storm, Landslides, Mudslides, and Flooding | Inland Flooding (primary); also designated: Landslide, Winter Weather | $496,490.87 | ||
| 2007-12-08 | 2007-12-01 | DR-1734-WA | Major disaster | Severe Storms, Flooding, Landslides, and Mudslides | Inland Flooding; Landslide | $3,879,707.73 | ||
| 2007-02-14 | 2006-12-14 | DR-1682-WA | Major disaster | Severe Winter Storm, Landslides, and Mudslides | Landslide; Winter Weather | $1,157,097.26 | ||
| 2006-05-17 | 2006-01-27 | DR-1641-WA | Major disaster | Severe Storms, Flooding, Tidal Surge, Landslides, and Mudslides | Inland Flooding; Landslide | $208,865.99 | ||
| 2005-09-07 | 2005-08-29 | EM-3227-WA | Emergency | Hurricane Katrina Evacuation | Hurricane: evacuation support, not a local hazard event; not counted | no Public Assistance recorded | ||
| 2003-11-07 | 2003-10-15 | DR-1499-WA | Major disaster | Severe Storms and Flooding | Inland Flooding | $538,767.85 | ||
| 2001-03-01 | 2001-02-28 | DR-1361-WA | Major disaster | Earthquake | Earthquake | $371,411.99 | ||
| 1997-04-02 | 1997-03-18 | DR-1172-WA | Major disaster | Heavy Rains, Snow Melt, Flooding, Land & Mud Slides | Inland Flooding (primary); also designated: Landslide | no Public Assistance recorded | ||
| 1997-01-17 | 1996-12-26 | DR-1159-WA | Major disaster | Severe Winter Storms, Land & Muds Slides,Flooding | Inland Flooding; Landslide; Winter Weather | no Public Assistance recorded | ||
| 1996-01-03 | 1995-11-07 | DR-1079-WA | Major disaster | Severe Storms, High Wind, and Flooding | Inland Flooding; Strong Wind | no Public Assistance recorded | ||
| 1993-03-04 | 1993-01-20 | DR-981-WA | Major disaster | Severe Storms & High Wind | Strong Wind | no Public Assistance recorded | ||
| 1990-11-26 | 1990-11-09 | DR-883-WA | Major disaster | Severe Storms & Flooding | Inland Flooding | no Public Assistance recorded | ||
| 1980-05-21 | 1980-05-21 | DR-623-WA | Major disaster | Volcanic Eruption, Mt. St. Helens | Volcanic Activity | no Public Assistance recorded | ||
| 1979-12-31 | 1979-12-31 | DR-612-WA | Major disaster | Storms, High Tides, Mudslides & Flooding | Inland Flooding (primary); also designated: Coastal Flooding, Landslide | PA not declared for this county | ||
| 1975-12-13 | 1975-12-13 | DR-492-WA | Major disaster | Severe Storms & Flooding | Inland Flooding | no Public Assistance recorded | ||
| 1974-01-25 | 1974-01-25 | DR-414-WA | Major disaster | Severe Storms, Snowmelt & Flooding | Inland Flooding | no Public Assistance recorded | ||
| 1965-05-11 | 1965-05-11 | DR-196-WA | Major disaster | Earthquake | Earthquake | no Public Assistance recorded | ||
| 1964-12-29 | 1964-12-29 | DR-185-WA | Major disaster | Heavy Rains & Flooding | Inland Flooding | no Public Assistance recorded |
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.
Statewide declarations
Source: 2
| Declared | Incident began | FEMA number | Type | Title | Mapped hazard |
|---|---|---|---|---|---|
| 1963-03-02 | 1963-03-02 | DR-146-WA | Major disaster | Floods | Inland Flooding |
| 1962-10-20 | 1962-10-20 | DR-137-WA | Major disaster | Severe Storms | Hazard not mapped (severe storm title names no single hazard); not counted |
| 1957-03-06 | 1957-03-06 | DR-70-WA | Major disaster | Floods | Inland Flooding |
| 1956-02-25 | 1956-02-25 | DR-50-WA | Major disaster | Flood | Inland Flooding |
FEMA recorded these with designated area Statewide and no county, so they are listed on every county page in the state and not counted with county rows. Local data needed: whether each one affected this county.
16 Fire Management declarations (1970-07-18 to 1998-09-25) FEMA filed as Statewide with no county; each names one local fire. Listed on the state page.
Public Assistance filed under this county for declarations that do not list it: 1 row, $42,311.71
Sources: 2, 3
| FEMA number | Declared | Title | Applicant | PA obligatedfederal share obligated, nominal dollars |
|---|---|---|---|---|
| DR-4635-WA | 2022-01-05 | Severe Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides | Public Utility District #1 of Mason County | $42,311.71 |
FEMA's Public Assistance summaries file these applicants under this county, but FEMA's declaration rows for these disasters do not designate it (an electric cooperative or district serving several counties, for example). Not in any declaration row above and not counted.
Public Assistance not placed in any Washington county: 1 row, $248,381.20; listed on the Washington state page.
Source: 3
Previous occurrences by hazard, with explicit no-event rows
Sources: 2, 6, 7
| Hazard | Storm Events records, all years on file(years in the Period column) | Since plan approvalrecords | In the 12 months before plan approvalrecords | Last 5 yearsrecords | Declared incidents, all yearsseparate disasters | Declared since approvalseparate disasters | 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 | 1 | 0 | 0 | 0 | 1 | 0 | 1996 to 2026-06-30 | |
| Cold Wave | 0 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events |
| Drought | 0 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events |
| Earthquake | 0 | 0 | 0 | 0 | 2 | 0 | Storm Events does not record earthquakes; the USGS earthquake catalog is the source. | |
| Hail | 1 | 0 | 0 | 0 | 0 | 0 | 1955 to 2026-06-30 | |
| Heat Wave | 3 | 0 | 1 | 2 | 0 | 0 | 1996 to 2026-06-30 | |
| Hurricane | 0 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events |
| Ice Storm | 1 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | |
| Inland Flooding | 5 | 0 | 0 | 0 | 21 | 2 | 1996 to 2026-06-30 | |
| Landslide | 4 | 0 | 0 | 0 | 15 | 2 | 1996 to 2026-06-30 | |
| Lightning | 2 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | |
| Strong Wind | 32 | 0 | 0 | 0 | 9 | 2 | 1955 to 2026-06-30 | Includes 21 High Wind and 11 Strong Wind records. |
| Tornado | 1 | 0 | 0 | 0 | 1 | 0 | 1950 to 2026-06-30 | |
| Tsunami | 0 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events |
| Volcanic Activity | 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) |
| Wildfire | 2 | 0 | 0 | 0 | 1 | 0 | 1996 to 2026-06-30 | |
| Winter Weather | 67 | 4 | 4 | 12 | 10 | 1 | 1996 to 2026-06-30 |
Notable Storm Events records
Sources: 1, 6, 7
| Date | Event type | Magnitude or extent | Damagenominal dollars | Deaths, injuriesdirect only | Location | Flags | Why listed |
|---|---|---|---|---|---|---|---|
| 2023-05-12 | Heat | $0 property; $0 crops, reported for the zone (2023 dollars) | 0, 0 | NWS zone WAZ511 (HOOD CANAL AREA), zone-level | in the 12 months before plan approval; within last 5 years | B1-c worst recorded: Excessive Heat, Heat | |
| 2019-10-18 | Tornado | EF1, 0.68 mi within this county, 90 yd wide | $150,000 property; $0 crops (2019 dollars) | 0, 0 | BAY SHR | B1-c worst recorded: Tornado | |
| 2012-12-17 | Coastal Flood | $2,000 property; $0 crops, reported for the zone (2012 dollars) | 0, 0 | NWS zone WAZ511 (HOOD CANAL AREA), zone-level | B1-c worst recorded: Coastal Flood, Storm Surge/Tide | ||
| 2012-10-04 | Wildfire | property not reported; $1,100,000 crops, reported for the zone (2012 dollars) | 0, 0 | NWS zone WAZ511 (HOOD CANAL AREA), zone-level | B1-c worst recorded: Wildfire | ||
| 2009-11-18 | High Wind | 93 kt (107 mph) measured gust | $0 property; $0 crops, reported for the zone (2009 dollars) | 0, 0 | NWS zone WAZ513 (OLYMPICS), zone-level | B1-c worst recorded: High Wind and Strong Wind | |
| 2009-01-07 | Flood | $900,000 property; $0 crops (2009 dollars) | 0, 0 | SHELTON | B1-c worst recorded: Flash Flood, Flood, Lakeshore Flood | ||
| 2008-12-21 | Heavy Snow | $600,000 property; $0 crops, reported for the zone (2008 dollars) | 0, 0 | NWS zone WAZ511 (HOOD CANAL AREA), zone-level | B1-c worst recorded: Winter Storm, Heavy Snow, Blizzard, Lake-Effect Snow, Winter Weather, Sleet | ||
| 2008-01-14 | Strong Wind | 43 kt (49 mph) estimated gust | $0 property; $0 crops, reported for the zone (2008 dollars) | 1, 0 | NWS zone WAZ511 (HOOD CANAL AREA), zone-level | deaths or injuries recorded | |
| 2007-12-03 | Debris Flow | $500,000 property; $0 crops, reported for the zone (2007 dollars) | 1, 0 | NWS zone WAZ511 (HOOD CANAL AREA), zone-level | deaths or injuries recorded | ||
| 2006-12-14 | High Wind | 78 kt (90 mph) measured gust | $1,000,000 property; $0 crops, reported for the zone (2006 dollars) | 1, 1 | NWS zone WAZ512 (LOWER CHEHALIS VALLEY AREA), zone-level | deaths or injuries recorded | |
| 1997-07-05 | Lightning | $70,000 property; crops not reported (1997 dollars) | 0, 0 | BELFAIR | B1-c worst recorded: Lightning | ||
| 1985-10-22 | Hail | 1 in | damage not recorded (pre-1996 record) | 0, 0 | location not recorded | B1-c worst recorded: Hail |
The full list is in the Excel file, sheet "B1-d Storm Events history" (119 rows).
Location is the place NOAA recorded, as written in its data; it need not be a jurisdiction in this plan.
Local data needed: state-declared emergencies, from your state emergency management agency (federal data do not include them).
Tribal and special-area declarations in this state are listed on the state page.
Supports FEMA checklist item B1-e: probability of future events
Probability: FEMA annualized frequency and descriptor per hazard
Sources: 5, 6
| 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 | 0.01 | events per year | about 1 in 100 years | Possible | FEMA annualized frequency (modeled) | 0 | 1994 to 2023 (30 years) | see B1-f | 0.01 is NRI's minimum avalanche frequency for a county in an avalanche susceptibility zone; NRI records no avalanche here, so the descriptor reflects the floor, not local events. |
| Coastal Flooding | 3.15 | events per year at a location (modeled) | about 3.1 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 | event-days per year | none modeled | event-days in 0 of 30 years, 1996 to 2025 (0%) | 0 | 2005-11-12 to 2024-11-12 (19 years) | countywide | No Storm Events cold wave record, 1996 to 2025. | |
| Drought | 1.27 | event-days per year | about 1.27 days per year | event-days in 0 of 30 years, 1996 to 2025 (0%) | 35 | 2000 to 2025 (25.25 years; D3 and D4 only) | countywide | No Storm Events drought record, 1996 to 2025 | |
| Earthquake | 0.0294 | annual probability at a location | chance a given location in the county has at least minor-damage shaking in a year: 2.94% | not shown | modeled | see B1-f | No descriptor (Storm Events does not record earthquakes). | ||
| Hail | 0.0103 | events per year | about 1 in 97 years | Possible | FEMA annualized frequency (modeled) | 0.4 (modeled) | 1986 to 2023 (38 years) | countywide | |
| Heat Wave | 2.67 | event-days per year | about 2.67 days per year | Likely (from Storm Events: 3 of 30 years) | event-days in 3 of 30 years, 1996 to 2025 (10%) | 35.3 | 2005-11-12 to 2024-11-12 (19 years) | countywide | |
| Hurricane | events per year | 1851 to 2024 (Atlantic); 1949 to 2024 (Pacific) | see B1-f | Not Applicable in NRI for this county; no descriptor. | |||||
| Ice Storm | 0.306 | event-days per year | about 0.306 days per year | Possible (from Storm Events: 1 of 30 years) | event-days in 1 of 30 years, 1996 to 2025 (3.33%) | 21 | 1946-12-31 to 2014-02-12 (67 years) | countywide | |
| Inland Flooding | 0.179 | event-days per year | about 0.179 days per year | Likely (from Storm Events: 4 of 30 years) | event-days in 4 of 30 years, 1996 to 2025 (13.3%) | 5 | 1996 to 2023 (28 years) | see B1-f | |
| Landslide | 10.9 | events per year (modeled) | about 10.9 per year | Highly likely | FEMA annualized frequency (modeled) | not shown | modeled | see B1-f | |
| Lightning | 5.15 | days per year with a strike | about 5.15 days per year | Highly likely | FEMA annualized frequency (modeled) | not shown | 1995 to 2023 (29 years; CONUS) | countywide | |
| Strong Wind | 0.00883 | events per year | about 1 in 113 years | Unlikely | FEMA annualized frequency (modeled) | 1 | 1986 to 2023 (38 years) | countywide | |
| Tornado | 0.0434 | events per year | about 1 in 23 years | Possible | FEMA annualized frequency (modeled) | not shown | 1950 to 2023 (EF2+); 1986 to 2023 (EF0-1) | see B1-f | |
| Tsunami | 0.0553 | annual probability at the most exposed location (used in place of a county value) | chance at the county's most exposed location in a year: 5.53% | Storm Events records in 0 of 30 years, 1996 to 2025 (0%) | not shown | modeled | see B1-f | No descriptor: no Storm Events record 1996 to 2025 | |
| Volcanic Activity | 0.001 | annual probability | about 1 in 1,000 years | Unlikely | FEMA annualized frequency (modeled) | not shown | modeled | see B1-f | |
| Wildfire | 0.0000654 | annual probability at a location | chance a given location in the county burns in a year: 0.00654% | Possible (from Storm Events: 2 of 30 years) | Storm Events records in 2 of 30 years, 1996 to 2025 (6.67%) | not shown | modeled | see B1-f | Descriptor from Storm Events, not NRI. |
| Winter Weather | 11.8 | event-days per year | about 11.8 days per year | Likely (from Storm Events: 18 of 30 years) | event-days in 18 of 30 years, 1996 to 2025 (60%) | 209 | 2005-11-12 to 2024-11-12 (19 years) | countywide |
FEMA annualized frequency (modeled) is the National Risk Index v1.20 (December 2025) estimate of how often a hazard affects this county in a year; it is not recorded events divided by years, and its unit differs by hazard (events, event-days, or days with a lightning strike per year). For earthquake, wildfire, coastal flooding and tsunami the value is the chance (or number of events) at a location in the county, not across the county, so no "1 in N years" is given and the descriptor comes from Storm Events where it has a record (none for earthquake). The Methods page gives each hazard's method, from FEMA's National Risk Index Technical Documentation v1.20.
Where NRI gives event-days, the descriptor comes from the share of years with a Storm Events record; NRI's source records more events, so the two differ.
Descriptor scale used in this packet (defined per unit)
Sources: 5, 6
| 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 |
Intensity bands: historical frequency (Storm Events)
Source: 6
| Hazard | Band | Years | Eventscounty-coded records | Years in period | Events per yearevents / years |
|---|---|---|---|---|---|
| Hail | 1.00-1.99 in | 1996 to 2025 | 0 | 30 | 0 |
| Hail | 2.00 in+ | 1996 to 2025 | 0 | 30 | 0 |
| Thunderstorm Wind (counted as NRI Strong Wind) | 50-64 kt | 1996 to 2025 | 0 | 30 | 0 |
| Thunderstorm Wind (counted as NRI Strong Wind) | 65 kt+ | 1996 to 2025 | 0 | 30 | 0 |
| Thunderstorm Wind (counted as NRI Strong Wind) | unmeasured or below 50 kt | 1996 to 2025 | 0 | 30 | 0 |
| Tornado | EF0-1 | 1996 to 2025 | 1 | 30 | 0.0333 |
| Tornado | EF2-3 | 1996 to 2025 | 0 | 30 | 0 |
| Tornado | EF4-5 | 1996 to 2025 | 0 | 30 | 0 |
| Tornado | unrated (EFU) | 1996 to 2025 | 0 | 30 | 0 |
The bands show how often events of each severity were recorded in this county, to profile how severe events have been (FEMA's probability item asks for the range of intensities).
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.
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 (https://resilience.climate.gov/).
Supports FEMA checklist item B1-f: hazards that vary across jurisdictions
Range of census tract risk within the county
Source: 5
| Hazard | Tractsrated of all | NRI risk score, 0 to 100 | Tracts by rating | ||
|---|---|---|---|---|---|
| Min | Median | Max | |||
| Avalanche | 5 of 19 | 25.3 | 27.2 | 29.5 | Very Low 5, Not Applicable 14 |
| Coastal Flooding | 16 of 19 | 69.6 | 93.0 | 98.1 | Relatively High 5, Relatively Moderate 9, Very Low 2, No Rating 3 |
| Cold Wave | 0 of 19 | No Rating 19 | |||
| Drought | 7 of 19 | 67.0 | 67.1 | 68.5 | Very Low 7, No Rating 12 |
| Earthquake | 19 of 19 | 82.7 | 94.4 | 99.4 | Very High 2, Relatively High 14, Relatively Moderate 3 |
| Hail | 19 of 19 | 1.2 | 5.5 | 12.8 | Very Low 19 |
| Heat Wave | 19 of 19 | 6.5 | 53.0 | 70.3 | Relatively Moderate 7, Relatively Low 10, Very Low 2 |
| Hurricane | 0 of 19 | Not Applicable 19 | |||
| Ice Storm | 19 of 19 | 1.7 | 14.1 | 39.7 | Relatively Low 1, Very Low 18 |
| Inland Flooding | 19 of 19 | 8.2 | 74.4 | 93.8 | Relatively High 7, Relatively Moderate 7, Relatively Low 4, Very Low 1 |
| Landslide | 19 of 19 | 28.7 | 97.3 | 99.8 | Relatively High 4, Relatively Moderate 8, Relatively Low 6, Very Low 1 |
| Lightning | 19 of 19 | 2.7 | 19.3 | 33.0 | Relatively Low 9, Very Low 10 |
| Strong Wind | 19 of 19 | 5.0 | 14.2 | 20.2 | Relatively Low 1, Very Low 18 |
| Tornado | 19 of 19 | 3.5 | 14.5 | 24.9 | Very Low 19 |
| Tsunami | 14 of 19 | 20.8 | 47.0 | 80.5 | Relatively Moderate 1, Relatively Low 5, Very Low 8, No Rating 2, Not Applicable 3 |
| Volcanic Activity | 5 of 19 | 42.1 | 68.2 | 81.2 | Very Low 5, No Rating 14 |
| Wildfire | 19 of 19 | 28.5 | 71.4 | 80.8 | Relatively Low 10, Very Low 9 |
| Winter Weather | 19 of 19 | 26.4 | 52.1 | 67.0 | Relatively Moderate 12, Relatively Low 7 |
Drought: Agriculture is all of NRI's expected annual loss for this hazard in the county, so the tract range mostly reflects where crop and livestock value is.
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.
The score ranks a tract against all U.S. tracts (100 = highest). The rating is FEMA's category for the tract's risk value, computed differently, so the two can disagree.
Frequency data for drought, hail, heat wave, ice storm, lightning, strong wind and winter weather are county-wide or coarse (49 km grid or NWS zone), the same for every jurisdiction; the tract range mostly reflects where buildings and people are (crop and livestock value where a line above names agriculture).
Each jurisdiction (starting figures from federal data)
Sources: 1, 3, 4, 6
| Jurisdiction | Type | Plan status | Repetitive lossFMA RL and SRL (44 CFR 77.2); repeat-flood, any definition | Public Assistance to this jurisdictionFEMA records matched by applicant name; federal share obligated, nominal dollars | Event records naming this placeall years; since its plan | Notes |
|---|---|---|---|---|---|---|
| Mason County | County | Approved, expires 2028-09-12 | FMA RL 1, SRL 4; any 26 | $5,333,313.73 | 0 total; 0 since its plan | Includes $126,284.52 for declarations not counted as hazard incidents (DR-4481-WA). |
| Shelton city | City | Approved, expires 2028-09-12 | FMA RL 0, SRL 0; any 0 | $238,744.99 | 1 total; 0 since its plan | Includes $48,385.72 for declarations not counted as hazard incidents (DR-4481-WA). |
Repetitive-loss counts are for whole NFIP communities, which can extend beyond this county (see the note in B2-c).
School districts and special districts get a plan clock row only.
County Public Assistance in B1-d also includes applicants filed under the county that are not jurisdictions in this plan (for example state agencies, special districts and nonprofits), so the jurisdiction rows add up to less.
Supports FEMA checklist items B2-a and B2-b: vulnerability and potential impacts
Local data needed
The table below gives county-level starting figures; the plan describes impacts for each jurisdiction and its own assets.
- Critical facilities and lifelines per hazard
- A problem statement per jurisdiction 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
Sources: 1, 2, 3, 5, 6, 7
| Hazard | Building exposuremodeled dollars | Agriculture exposuremodeled dollars | Population exposedpeople | EAL buildingsmodeled dollars per year | EAL agriculturemodeled dollars per year | Cost of expected deaths and injuriesFEMA's dollar value per year, not property damage | EAL as % of exposurebuildings; agriculture where noted | Storm Events damage since 2023-09-13county-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 | $3,338,700 | n/a | under 1 | $4 | n/a | $221 | 0.000105% | ||||
| Coastal Flooding | $878,725,748 | n/a | 3,113 | $1,181,997 | n/a | $94,642 | 0.135% | ||||
| Cold Wave | $0 | $0 | 0 | $0 | $0 | $0 | building exposure is 0 in NRI | ||||
| Drought | n/a | $3,313,695 | n/a | n/a | $5 | n/a | 0.000144% (agriculture) | NRI has no building exposure for this hazard; agriculture shown | |||
| Earthquake | $23,442,671,922 | n/a | 65,726 | $18,360,232 | n/a | $7,972,216 | 0.0783% | ||||
| Hail | $13,634,127,879 | $62,486,333 | 65,689 | $2,869 | $325 | $646 | under 0.0001% | ||||
| Heat Wave | $13,634,127,879 | $62,486,333 | 65,689 | $177 | $5,969 | $647,321 | under 0.0001% | ||||
| Hurricane | Not Applicable in NRI for this county | ||||||||||
| Ice Storm | $13,574,312,529 | n/a | 65,383 | $16,170 | n/a | $3,297 | 0.000119% | ||||
| Inland Flooding | $13,490,182,707 | $17,617,475 | 2,787 | $14,760,445 | $5,581 | $41,845 | n/a (see note) | $832,604.76 | 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. | ||
| Landslide | $1,097,794,317 | n/a | 4,793 | $10,894 | n/a | $489,286 | 0.000992% | $832,604.76 | |||
| Lightning | $13,634,127,879 | n/a | 65,689 | $5,282 | n/a | $48,929 | under 0.0001% | ||||
| Strong Wind | $13,634,127,879 | $62,486,333 | 65,689 | $25,852 | $2 | $7,536 | 0.00019% | $832,604.76 | |||
| Tornado | $13,634,127,879 | $62,486,333 | 65,689 | $29,695 | $152 | $63,718 | 0.000218% | ||||
| Tsunami | $3,343,238,561 | n/a | 1,218 | $85,988 | n/a | $347,131 | 0.00257% | ||||
| Volcanic Activity | $13,634,127,879 | n/a | 65,689 | under $1 | n/a | $8 | under 0.0001% | ||||
| Wildfire | $1,591,891,365 | $8,058,002 | 8,552 | $24,600 | $2 | $1,264 | 0.00155% | ||||
| Winter Weather | $13,634,127,879 | $62,486,333 | 65,689 | $7,398 | $436 | $38,952 | under 0.0001% | $0 | $811,465.35 |
Totals since 2023-09-13 (Storm Events through 2026-06-30): 0 county-coded records, 0 with a damage value recorded (including $0), $0; 4 zone-level records, 2 with a damage value recorded (including $0), $0 reported for the zone; Public Assistance: $832,604.76 on 3 counted declarations, 2 of them with Public Assistance.
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 does not add up to the total; the unit total counts each declaration once.
NRI computes earthquake exposure on its own basis, so it exceeds the county building value in B2-a.
Supports FEMA checklist item B2-a: vulnerability (county context)
County context
Source: 5
| Measure | Value |
|---|---|
| Population | 65,689 |
| Building value (total, not at risk) | $13,634,127,879 |
| Agriculture value (total, not at risk) | $62,486,333 |
| NRI risk rating (all hazards) | Relatively Moderate |
| Expected annual loss, buildings and agriculture, all hazards | $34,524,076 |
| 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) | $9,757,013 |
| Social vulnerability rating | Relatively High |
| Community resilience rating | Relatively Low |
| NRI version | December 2025 |
FEMA's all-hazard expected annual loss adds buildings, agriculture and population equivalence; this table gives the property part and the population-equivalence part as separate rows.
Social vulnerability: higher means people are more likely to be harmed and slower to recover. Community resilience: lower means the community is less able to recover. High social vulnerability and low resilience both raise the NRI risk rating.
Supports FEMA checklist item B2-c: repetitive loss properties
Repetitive loss in this county, both definitions
Sources: 1, 4
| Definition | Properties | Severe repetitive loss | Properties |
|---|---|---|---|
| Repetitive loss, FMA definition (44 CFR 77.2) | 1 | Severe repetitive loss, FMA definition (44 CFR 77.2) | 4 |
| Repetitive loss, NFIP insurance definition | 26 | Severe repetitive loss, NFIP insurance definition | 3 |
The state NFIP coordinator's list, the source FEMA's Handbook names, often uses the NFIP insurance definition (second row).
Repeat-flood properties: county and state-level rows
Sources: 1, 4
| Scope | RL, FMAproperties | SRL, FMAproperties | RL, NFIPproperties | SRL, NFIPproperties | Any categoryproperties | Mitigatedproperties | Currently insuredproperties |
|---|---|---|---|---|---|---|---|
| County total | 1 | 4 | 26 | 3 | 27 | 0 | 11 |
| of which: Mason County (unincorporated area) | 1 | 4 | 25 | 3 | 26 | 0 | 10 |
| of which: Skokomish Indian Tribe (community ID not in plan data) | 0 | 0 | 1 | 0 | 1 | 0 | 1 |
| Statewide, no county in FEMA's file | 0 | 0 | 2 | 0 | 2 | 0 | 0 |
The statewide row counts properties FEMA's file gives with no county in this state; they are listed for reference and are not in this county's counts.
Repeat-flood properties by jurisdiction in the plan (NFIP community)
Sources: 1, 4
| Jurisdiction | NFIP community ID | RL, FMAproperties | SRL, FMAproperties | RL, NFIPproperties | SRL, NFIPproperties | Any categoryproperties | Mitigatedproperties | Currently insuredproperties |
|---|---|---|---|---|---|---|---|---|
| Mason County | 530115 | 1 | 4 | 25 | 3 | 26 | 0 | 10 |
| Shelton city | 530116 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Counts by occupancy group for each jurisdiction are in the Excel file, sheet "B2-c Jurisdictions".
Jurisdiction 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 jurisdiction row, while the county table counts only its part in this county.
County repeat-flood properties by occupancy group
Sources: 1, 4
| Occupancy group | RL, FMAproperties | SRL, FMAproperties | RL, NFIPproperties | SRL, NFIPproperties | Any categoryproperties | Mitigatedproperties | Currently insuredproperties |
|---|---|---|---|---|---|---|---|
| single-family residential | 1 | 4 | 25 | 3 | 26 | 0 | 10 |
| 2 to 4 unit residential | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| other residential | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| non-residential | 0 | 0 | 1 | 0 | 1 | 0 | 1 |
| not reported | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
FEMA's occupancy groups have no institutional class; institutional properties are counted in non-residential or other residential in the table by occupancy group.
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. NFIP repetitive loss (the FEMA insurance definition) is 2 or more claims over $1,000 in 10 years, and a property can leave that group once it is mitigated. Also shown: NFIP severe repetitive loss, any category, mitigated and currently insured. The Methods page gives the OpenFEMA field details.
Counts are aggregates of FEMA's public NFIP Multiple Loss Properties file (FEMA's data date 2026-08-02; file version 2026-08-04). No property is identified. County assignment is FEMA's geocode.
In this county 0 properties are FMA repetitive loss but not NFIP repetitive loss, and 25 properties are NFIP repetitive loss but not FMA repetitive loss.
Exact counts; no count suppression.
Sources
Tables cite these sources by number. The full list, for the plan's bibliography (FEMA review item A4-a):
- FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-29T134039Z, pulled 2026-09-30, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
- FEMA, OpenFEMA DisasterDeclarationsSummaries v2, version 2026-09-29T162832Z, pulled 2026-09-30, https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries (API)
- FEMA, OpenFEMA PublicAssistanceFundedProjectsSummaries v1, version 2026-09-29T150754Z, pulled 2026-09-30, https://www.fema.gov/api/open/v1/PublicAssistanceFundedProjectsSummaries (API)
- FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-30, 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 2026-09-30, 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 2026-09-30, 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 2026-09-30, 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 2026-09-30, 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 (used to match place names and codes; no table prints its values)
What this packet is and what the plan adds
This packet is the federal data for the plan's risk assessment, organized by the items of FEMA's Local Mitigation Plan Review Tool, Element B. Each section heading names the item its tables support; the plan and FEMA's review decide whether the item is met.
The plan adds what only the community has: local data on assets, critical facilities, development and each jurisdiction's impacts; local hazard history, including state-declared emergencies; the mitigation strategy; and adoption.
How the federal data are built: National Risk Index values are FEMA's model, not counts of events. Storm Events is more complete from 1996; zone-level records are placed by forecast zone, not by location in the county. Public Assistance for a jurisdiction is matched by applicant name. The Methods page gives every rule and the known edge cases.
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).
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). Mason County, WA: risk-assessment baseline packet, release 2026-10 (data as of 2026-09-30; County FIPS 53045). Automated baseline. https://hazardplain.org/wa/53045/ 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: [email protected]
Hazard Plain release 2026-10. As of 2026-09-30; Storm Events data through 2026-06-30. Automated baseline.