Summary
Plan status as of 2026-09-30: No county-level plan row in FEMA data.
Highest expected annual loss (FEMA National Risk Index, modeled total; see B1-a): Inland Flooding ($29,059,608 a year), Tornado ($1,338,717) and Strong Wind ($980,505).
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
No county-level plan row in FEMA data
What changed since your last plan
Not available. No county-level plan row in FEMA data, so there is no approval date to count from.
Sources: 1, 2, 4, 6 (numbered list at the end)
Plan status for every jurisdiction listed in this county: 48 rows, in the section "Plan clock: Plan status for every jurisdiction listed in this county" on the following 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
Source: 1
| Jurisdiction | Type | Status | Plan | Approved | Expires | Days to expirynegative = days since expiry | Update underway | Notes |
|---|---|---|---|---|---|---|---|---|
| Clark borough | Organized Borough | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-04 |
| Farrell city | City | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-03-27 |
| Fredonia borough | Organized Borough | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-10 |
| Greenville borough | Organized Borough | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-10 |
| Grove City borough | Organized Borough | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | |
| Hermitage city | City | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-11 |
| Jackson Center borough | Organized Borough | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-06 |
| Jamestown borough | Organized Borough | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-11 |
| Mercer borough | Organized Borough | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-11 |
| New Lebanon borough | Organized Borough | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-03-28 |
| Sandy Lake borough | Organized Borough | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-05 |
| Sharon city | City | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-05 |
| Sharpsville borough | Organized Borough | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-12 |
| Sheakleyville borough | Organized Borough | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-05-18 |
| Stoneboro borough | Organized Borough | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-06-06 |
| West Middlesex borough | Organized Borough | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-12 |
| Wheatland borough | Organized Borough | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-05-09 |
| Coolspring township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-03 |
| Deer Creek township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-08 |
| Delaware township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-05 |
| East Lackawannock township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-10 |
| Fairview township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-03 |
| Findley township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-05 |
| French Creek township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-10 |
| Greene township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-03 |
| Hempfield township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-04 |
| Jackson township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-05 |
| Jefferson township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-10 |
| Lackawannock township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-10 |
| Lake township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-12 |
| Liberty township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-13 |
| Mill Creek township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-03 |
| New Vernon township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-06-12 |
| Otter Creek township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-16 |
| Perry township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-05 |
| Pine township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-03 |
| Pymatuning township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-13 |
| Salem township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-03 |
| Sandy Creek township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-03 |
| Sandy Lake township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-05 |
| Shenango township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-20 |
| South Pymatuning township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-12 |
| Springfield township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-04 |
| Sugar Grove township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-03 |
| West Salem township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-11 |
| Wilmington township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-12 |
| Wolf Creek township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-10 |
| Worth township | Township | Approved, expires 2028-03-19 | Mercer County Hazard Mitigation Plan (FEMA plan 108946) | 2023-03-20 | 2028-03-19 | 536 | FEMA tracker shows a plan in progress | this jurisdiction approved 2023-04-12 |
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 | Storm Events coverage note |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Inland Flooding | Relatively Moderate | Relatively Moderate | $29,006,613 | $24,355 | $28,640 | $29,059,608 | 105 | |
| 2 | Tornado | Relatively Low | Relatively Low | $980,065 | $2,310 | $356,343 | $1,338,717 | 12 | |
| 3 | Strong Wind | Relatively Moderate | Relatively Moderate | $522,702 | $2,699 | $455,104 | $980,505 | 493 | Includes 22 High Wind and 2 Strong Wind records (NOAA non-thunderstorm wind types, outside NRI's Strong Wind definition). |
| 4 | Lightning | Relatively High | Relatively High | $9,514 | n/a | $916,982 | $926,496 | 0 | No recorded events in Storm Events since 1996 (data through 2026-06-30). |
| 5 | Hail | Relatively Moderate | Relatively Low | $573,680 | $45,249 | $28,322 | $647,250 | 149 | |
| 6 | Hurricane | Relatively Low | Relatively Low | $271,438 | $25,714 | $9,317 | $306,469 | 0 | Declared 2 times; no Storm Events record of this type. |
| 7 | Earthquake | Very Low | Very Low | $210,210 | n/a | $58,336 | $268,546 | Storm Events does not record earthquakes. | |
| 8 | Cold Wave | Very Low | Relatively Low | $1,219 | $18,244 | $235,637 | $255,100 | 9 | |
| 9 | Winter Weather | Relatively Moderate | Relatively Moderate | $136,943 | $43 | $31,086 | $168,072 | 93 | |
| 10 | Heat Wave | Very Low | Very Low | $6 | $2,044 | $108,353 | $110,403 | 0 | No recorded events in Storm Events since 1996 (data through 2026-06-30). |
| 11 | Ice Storm | Relatively Low | Relatively Low | $23,751 | n/a | $29,558 | $53,309 | 10 | |
| 12 | Wildfire | Very Low | Very Low | $16,481 | $11 | $2,197 | $18,688 | 0 | No recorded events in Storm Events since 1996 (data through 2026-06-30). |
| 13 | Landslide | Very Low | Very Low | $241 | n/a | $496 | $737 | 0 | No recorded events in Storm Events since 1996 (data through 2026-06-30). |
| 14 | Drought | No Rating | No Expected Annual Losses | n/a | $0 | n/a | $0 | 2 |
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 lightning, wildfire and landslide records (Storm Events records these hazards only in part).
Not applicable to this county per NRI, with no federal declaration and no Storm Events record since 1996: avalanche, coastal flooding, tsunami and volcanic activity. That is the evidence for leaving them out of the plan.
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.
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 |
|---|---|
| Earthquake | tract 331 (Relatively Low, 41.7); tract 330 (Very Low, 39.7); tract 329 (Very Low, 37.6) |
| Hurricane | tract 318 (Relatively Low, 60.4); tract 326.01 (Relatively Low, 58.2); tract 331 (Relatively Low, 57.6) |
| Landslide | tract 318 (Relatively Low, 84.5); tract 326.01 (Relatively Low, 84.2); tract 331 (Relatively Low, 83.1) |
| Tornado | tract 326.01 (Relatively Moderate, 57.2); tract 318 (Relatively Moderate, 56.2); tract 331 (Relatively Moderate, 55.8) |
| Wildfire | tract 320 (Relatively Low, 75.0); tract 326.01 (Relatively Low, 71.5); tract 331 (Relatively Low, 71.1) |
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 331 is Census Tract 331). 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 |
|---|---|---|---|---|---|---|---|
| Cold/Wind Chill, Extreme Cold/Wind Chill | wind chill | 9 records, 2009 to 2025 (9 zone-level) | 1 day to 3 days (median 2 days); 9 with a recorded value | 3 consecutive days, 2025-01-20 to 2025-01-22, zone-level | Countywide (zone-level records). | ||
| Frost/Freeze (outside NRI's Cold Wave definition) | crop damage | 0 | |||||
| Drought | U.S. Drought Monitor scale (D0 to D4) | 2 records, 1999 (2 zone-level) | 61 days; 1 with a recorded value | 61 days (2 months), 1999-08-01 to 1999-09-30, a run of 2 consecutive Storm Events drought records, zone-level | Countywide (zone-level records). | 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) | 160 records, 1956 to 2026 | 0.75 in to 2.75 in (median 1 in); 160 with a recorded value | 2.75 in hail, 2019-05-28 | Hail, 2022-06-16, $30,000 property; $0 crops (2022 dollars) | Event records naming jurisdictions in the plan: Mercer borough (17 records), Grove City borough (16 records), Sandy Lake borough (11 records), Sandy Lake township (11 records), Sharon city (11 records), Greenville borough (10 records), Stoneboro borough (8 records), Farrell city (6 records), Hermitage city (5 records), Jackson Center borough (5 records); and 11 more jurisdictions (see the Excel file). | |
| Excessive Heat, Heat | heat index (in event narratives) | 0 | |||||
| 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) | 10 records, 1997 to 2011 (10 zone-level) | Ice Storm, 2005-01-05, $20,000 property; crops not reported (2005 dollars); NWS zone PAZ007 | Countywide (zone-level records). | |||
| Flash Flood, Flood, Lakeshore Flood | damage and flood days (flood depth: FIRM) | 105 records, 1996 to 2025 (5 zone-level) | Flash Flood, 2002-08-16, $250,000 property; crops not reported (2002 dollars) | Event records naming jurisdictions in the plan: Greenville borough (15 records), Sharon city (13 records), Mercer borough (10 records), Jamestown borough (7 records), Farrell city (4 records), Stoneboro borough (4 records), Grove City borough (3 records), Sandy Lake borough (3 records), Sandy Lake township (3 records), Sharpsville borough (3 records); and 7 more jurisdictions (see the Excel file). Zone-level records (5) apply countywide. | 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) | 0 | |||||
| Lightning | annualized frequency (the measure FEMA's Local Mitigation Planning Handbook names) | 0 | Storm Events lists lightning with damage or casualties. | ||||
| High Wind and Strong Wind (outside NRI's Strong Wind definition) | wind speed (kt and mph) | 24 records, 1996 to 2023 (24 zone-level) | 43 kt (49 mph) to 61 kt (70 mph) (median 50 kt (58 mph)); 21 with a recorded value | 61 kt (70 mph) estimated, High Wind, 2000-12-12; NWS zone PAZ007 | High Wind, 2008-09-14, $1,000,000 property; $0 crops (zone total, 2008 dollars) | Countywide (zone-level records). | |
| Thunderstorm Wind | wind speed (kt and mph) | 523 records, 1956 to 2026 | 48 kt (55 mph) to 130 kt (150 mph) (median 50 kt (58 mph)); 419 with a recorded value | 130 kt (150 mph), measurement type not recorded, Thunderstorm Wind, 1995-05-24 | Thunderstorm Wind, 2024-10-06, $1,000,000 property; $0 crops (2024 dollars) | Event records naming jurisdictions in the plan: Mercer borough (43 records), Grove City borough (39 records), Greenville borough (36 records), Hermitage city (25 records), Sharon city (25 records), Farrell city (23 records), Jamestown borough (23 records), Sandy Lake borough (21 records), Sandy Lake township (21 records), Sharpsville borough (20 records); and 12 more jurisdictions (see the Excel file). | |
| Tornado | Enhanced Fujita (Fujita before Feb 2007) | 25 records, 1954 to 2024 | F/EF0 to F/EF5 (median F/EF1); 21 with a recorded value | F5 tornado, 1985-05-31, 12 mi path length (whole path, pre-1996), 450 yd wide, $250,000 property; crops not recorded (1985 dollars), 8 direct deaths, 60 direct injuries | Tornado, 1985-05-31, $25,000,000 property; crops not recorded (1985 dollars) | Event records naming jurisdictions in the plan: Mercer borough (4 records), New Lebanon borough (2 records), Sharon city (2 records), Farrell city (1 record), Sandy Lake borough (1 record), Sandy Lake township (1 record), Sharpsville borough (1 record), Shenango township (1 record), Stoneboro borough (1 record), Wheatland borough (1 record). | 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). |
| Wildfire | acres burned (local data) | 0 | |||||
| Winter Storm, Heavy Snow, Blizzard, Lake-Effect Snow, Winter Weather, Sleet | none in data (snowfall: local data) | 93 records, 1996 to 2026 (93 zone-level) | Heavy Snow, 2004-12-20, $650,000 property; crops not reported (2004 dollars), 100 direct injuries (reported for the zone); NWS zone PAZ007 | Countywide (zone-level records). |
Where a hazard names more than 10 jurisdictions, the table lists the 10 with the most records; every one is in the Excel file, sheet "B1-c Extent".
In event narratives only (local data needed): wind chill, temperature, heat index, ice thickness, acres burned and snow depth; any physical measure of debris flow and lightning.
Storm Events records are more complete after 1996; before 1996 only Tornado (from 1950), Hail and Thunderstorm Wind (from 1955) exist. Zone-level records from zones that 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: 13 declarations covering 8 separate hazard incidents counted in this packet (declarations for the same incident count once; non-natural and evacuation-only declarations are not counted).
No county-level plan row in FEMA data, so there is no approval date to count from.
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 | Notes |
|---|---|---|---|---|---|---|---|
| 2020-03-30 | 2020-01-20 | DR-4506-PA | Major disaster | COVID-19 Pandemic | Non-natural, not counted | $5,794,694.67 | |
| 2020-03-13 | 2020-01-20 | EM-3441-PA | Emergency | COVID-19 | Non-natural, not counted | no Public Assistance recorded | same incident as DR-4506 |
| 2012-10-29 | 2012-10-26 | EM-3356-PA | Emergency | Hurricane Sandy | Hurricane | no Public Assistance recorded | |
| 2005-09-10 | 2005-08-29 | EM-3235-PA | Emergency | Hurricane Katrina | Hurricane: evacuation support, not a local hazard event; not counted | no Public Assistance recorded | |
| 2004-09-19 | 2004-09-17 | DR-1557-PA | Major disaster | Tropical Depression Ivan | Hurricane: designated for Hazard Mitigation only (no Public or Individual Assistance for this county); not counted | PA not declared for this county | |
| 2004-09-19 | 2004-09-08 | DR-1555-PA | Major disaster | Severe Storms and Flooding Associated with Tropical Depression Frances | Hurricane; Inland Flooding: designated for Hazard Mitigation only (no Public or Individual Assistance for this county); not counted | PA not declared for this county | |
| 2003-08-23 | 2003-07-21 | DR-1485-PA | Major disaster | Severe Storms, Tornadoes, and Flooding | Inland Flooding; Tornado | $1,050,390.42 | |
| 1996-01-21 | 1996-01-19 | DR-1093-PA | Major disaster | Severe Storms and Flooding | Inland Flooding | PA not declared for this county | |
| 1993-03-16 | 1993-03-13 | EM-3105-PA | Emergency | Severe Snowfall & Winter Storm | Winter Weather | no Public Assistance recorded | |
| 1985-06-03 | 1985-05-31 | DR-737-PA | Major disaster | Severe Storms, High Winds & Tornadoes | Tornado (primary); also designated: Strong Wind | no Public Assistance recorded | |
| 1981-06-15 | 1981-06-15 | DR-641-PA | Major disaster | Severe Storms & Flooding | Inland Flooding | no Public Assistance recorded | |
| 1977-01-29 | 1977-01-29 | EM-3026-PA | Emergency | Snowstorms | Winter Weather | no Public Assistance recorded | |
| 1972-06-23 | 1972-06-23 | DR-340-PA | Major disaster | Tropical Storm Agnes | Inland Flooding (primary); also designated: Hurricane | 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 |
|---|---|---|---|---|---|
| 1959-01-23 | 1959-01-23 | DR-89-PA | Major disaster | Floods | Inland Flooding |
| 1956-08-09 | 1956-08-09 | DR-61-PA | Major disaster | Storm | Hazard not mapped (severe storm title names no single hazard); not counted |
| 1956-05-21 | 1956-05-21 | DR-58-PA | Major disaster | Severe Storm | Hazard not mapped (severe storm title names no single hazard); not counted |
| 1956-03-15 | 1956-03-15 | DR-51-PA | Major disaster | Flood | Inland Flooding |
| 1955-08-20 | 1955-08-20 | DR-40-PA | Major disaster | Floods & Rains | 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.
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 |
|---|---|---|---|---|---|---|---|---|
| Cold Wave | 9 | 2 | 0 | 1996 to 2026-06-30 | ||||
| Drought | 2 | 0 | 0 | 1996 to 2026-06-30 | ||||
| Earthquake | 0 | 0 | 0 | Storm Events does not record earthquakes; the USGS earthquake catalog is the source. | ||||
| Hail | 160 | 26 | 0 | 1955 to 2026-06-30 | ||||
| Heat Wave | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events | |||
| Hurricane | 0 | 0 | 2 | 1996 to 2026-06-30 | No Storm Events records of this type; 2 federal declared incidents (see declarations table) | |||
| Ice Storm | 10 | 0 | 0 | 1996 to 2026-06-30 | ||||
| Inland Flooding | 105 | 4 | 4 | 1996 to 2026-06-30 | ||||
| Landslide | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events | |||
| Lightning | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events | |||
| Strong Wind | 547 | 142 | 1 | 1955 to 2026-06-30 | Includes 22 High Wind and 2 Strong Wind records. | |||
| Tornado | 25 | 1 | 2 | 1950 to 2026-06-30 | ||||
| Wildfire | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events | |||
| Winter Weather | 93 | 24 | 2 | 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 |
|---|---|---|---|---|---|---|---|
| 2025-01-20 | Cold/Wind Chill | $0 property; $0 crops (zone total, 2025 dollars) | 0, 0 | NWS zone PAZ007 (MERCER), zone-level | within last 5 years | B1-c worst recorded: Cold/Wind Chill, Extreme Cold/Wind Chill | |
| 2019-05-28 | Hail | 2.75 in | damage not reported | 0, 0 | SANDY LAKE | B1-c worst recorded: Hail | |
| 2008-09-14 | High Wind | 50 kt (58 mph) estimated gust | $1,000,000 property; $0 crops (zone total, 2008 dollars) | 0, 0 | NWS zone PAZ007 (MERCER), zone-level | B1-c most damaging: High Wind and Strong Wind | |
| 2005-01-05 | Ice Storm | $20,000 property; crops not reported (zone total, 2005 dollars) | 0, 0 | NWS zone PAZ007 (MERCER), zone-level | B1-c worst recorded: Ice Storm | ||
| 2004-12-20 | Heavy Snow | $650,000 property; crops not reported (zone total, 2004 dollars) | 0, 100 | NWS zone PAZ007 (MERCER), zone-level | deaths or injuries recorded | ||
| 2002-11-10 | Tornado | F2, 7 mi within this county, 500 yd wide | $1,000,000 property; crops not reported (2002 dollars) | 1, 19 | SHARPSVILLE | deaths or injuries recorded | |
| 2002-08-16 | Flash Flood | $250,000 property; crops not reported (2002 dollars) | 0, 0 | SHARON | B1-c worst recorded: Flash Flood, Flood, Lakeshore Flood | ||
| 2000-12-12 | High Wind | 61 kt (70 mph) estimated | $50,000 property; crops not reported (zone total, 2000 dollars) | 0, 0 | NWS zone PAZ007 (MERCER), zone-level | B1-c worst recorded: High Wind and Strong Wind | |
| 1999-08-01 | Drought | damage not reported | 0, 0 | NWS zone PAZ007 (MERCER), zone-level | B1-c worst recorded: Drought | ||
| 1995-05-24 | Thunderstorm Wind | 130 kt (150 mph), measurement type not recorded | $375,000 property; crops not recorded (1995 dollars) | 0, 0 | Mercer | B1-c worst recorded: Thunderstorm Wind | |
| 1985-05-31 | Tornado | F5, 12 mi path length (whole path, pre-1996), 450 yd wide | $250,000 property; crops not recorded (1985 dollars) | 8, 60 | location not recorded | deaths or injuries recorded | |
| 1985-05-31 | Tornado | F4, 7 mi path length (whole path, pre-1996), 350 yd wide | $25,000,000 property; crops not recorded (1985 dollars) | 0, 5 | location not recorded | B1-c most damaging: Tornado |
The full list is in the Excel file, sheet "B1-d Storm Events history" (951 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).
FEMA's declaration data list no tribal or special-area declarations for this state.
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 |
|---|---|---|---|---|---|---|---|---|---|
| Cold Wave | 3.63 | event-days per year | about 3.63 days per year | Likely | Storm Events event-days in 6 of 30 years, 1996 to 2025 (20%) | 69 | 2005-11-12 to 2024-11-12 (19 years) | countywide | |
| Drought | 0 | event-days per year | none modeled | Possible | Storm Events event-days in 1 of 30 years, 1996 to 2025 (3.33%) | 0 | 2000 to 2025 (25.25 years; D3 and D4 only) | countywide | NRI models no drought event-days here (2000 to 2025, 25.25 years; D3 and D4 only); Storm Events has a record in 1 of 30 years. The descriptor comes from Storm Events, which counts D2 drought that NRI leaves out. |
| Earthquake | 0.000598 | annual probability at a location | chance a given location in the county has at least minor-damage shaking in a year: 0.0598% | not shown | modeled | see B1-f | No descriptor (Storm Events does not record earthquakes). | ||
| Hail | 3.79 | events per year | about 3.79 per year | Highly likely | FEMA annualized frequency (modeled) | 144.0 (modeled) | 1986 to 2023 (38 years) | countywide | |
| Heat Wave | 1.05 | event-days per year | about 1.05 days per year | Storm Events event-days in 0 of 30 years, 1996 to 2025 (0%) | 22 | 2005-11-12 to 2024-11-12 (19 years) | countywide | No Storm Events heat wave record, 1996 to 2025 | |
| Hurricane | 0.0237 | events per year | about 1 in 42 years | Possible | FEMA annualized frequency (modeled) | 8 | 1851 to 2024 (Atlantic) | see B1-f | NRI counts hurricane and tropical storm tracks passing within storm-force wind range; federal declarations are in B1-d. |
| Ice Storm | 0.447 | event-days per year | about 0.447 days per year | Likely | Storm Events event-days in 6 of 30 years, 1996 to 2025 (20%) | 30 | 1946-12-31 to 2014-02-12 (67 years) | countywide | |
| Inland Flooding | 2.5 | event-days per year | about 2.5 days per year | Likely | Storm Events event-days in 24 of 30 years, 1996 to 2025 (80%) | 70 | 1996 to 2023 (28 years) | see B1-f | |
| Landslide | 0.201 | events per year (modeled) | about 1 in 5 years | Likely | FEMA annualized frequency (modeled) | not shown | modeled | see B1-f | |
| Lightning | 39.6 | days per year with a strike | about 39.6 days per year | Highly likely | FEMA annualized frequency (modeled) | not shown | 1995 to 2023 (29 years; CONUS) | countywide | |
| Strong Wind | 2.28 | events per year | about 2.28 per year | Highly likely | FEMA annualized frequency (modeled) | 87 | 1986 to 2023 (38 years) | countywide | |
| Tornado | 0.281 | events per year | about 1 in 4 years | Likely | FEMA annualized frequency (modeled) | not shown | 1950 to 2023 (EF2+); 1986 to 2023 (EF0-1) | see B1-f | |
| Wildfire | 0.0000548 | annual probability at a location | chance a given location in the county burns in a year: 0.00548% | 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 | |
| Winter Weather | 16.8 | event-days per year | about 16.8 days per year | Likely | Storm Events event-days in 25 of 30 years, 1996 to 2025 (83.3%) | 320 | 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 | 73 | 30 | 2.43 |
| Hail | 2.00 in+ | 1996 to 2025 | 4 | 30 | 0.133 |
| Thunderstorm Wind (counted as NRI Strong Wind) | 50-64 kt | 1996 to 2025 | 389 | 30 | 13 |
| Thunderstorm Wind (counted as NRI Strong Wind) | 65 kt+ | 1996 to 2025 | 3 | 30 | 0.1 |
| Thunderstorm Wind (counted as NRI Strong Wind) | unmeasured or below 50 kt | 1996 to 2025 | 57 | 30 | 1.9 |
| Tornado | EF0-1 | 1996 to 2025 | 10 | 30 | 0.333 |
| Tornado | EF2-3 | 1996 to 2025 | 1 | 30 | 0.0333 |
| Tornado | EF4-5 | 1996 to 2025 | 0 | 30 | 0 |
| Tornado | unrated (EFU) | 1996 to 2025 | 1 | 30 | 0.0333 |
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 | |||
| Cold Wave | 35 of 35 | 19.4 | 22.2 | 29.6 | Relatively Low 35 |
| Drought | 0 of 35 | No Rating 35 | |||
| Earthquake | 35 of 35 | 9.9 | 20.5 | 41.7 | Relatively Low 1, Very Low 34 |
| Hail | 35 of 35 | 47.9 | 68.2 | 82.7 | Relatively Moderate 14, Relatively Low 21 |
| Heat Wave | 35 of 35 | 2.7 | 4.0 | 8.5 | Very Low 35 |
| Hurricane | 35 of 35 | 42.6 | 51.3 | 60.4 | Relatively Low 17, Very Low 18 |
| Ice Storm | 35 of 35 | 6.7 | 18.0 | 64.8 | Relatively Low 5, Very Low 30 |
| Inland Flooding | 35 of 35 | 5.5 | 65.7 | 95.4 | Relatively High 11, Relatively Moderate 12, Relatively Low 8, Very Low 4 |
| Landslide | 35 of 35 | 15.5 | 48.5 | 84.5 | Relatively Low 4, Very Low 31 |
| Lightning | 35 of 35 | 49.0 | 74.7 | 93.5 | Relatively High 15, Relatively Moderate 19, Relatively Low 1 |
| Strong Wind | 35 of 35 | 41.5 | 65.0 | 84.0 | Relatively High 2, Relatively Moderate 24, Relatively Low 9 |
| Tornado | 35 of 35 | 28.8 | 40.7 | 57.2 | Relatively Moderate 4, Relatively Low 29, Very Low 2 |
| Wildfire | 35 of 35 | 25.9 | 58.5 | 75.0 | Relatively Low 6, Very Low 29 |
| Winter Weather | 35 of 35 | 44.0 | 64.5 | 84.7 | Relatively High 4, Relatively Moderate 26, Relatively Low 5 |
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 cold wave, 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.
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 |
|---|---|---|---|---|---|---|
| Clark borough | Organized Borough | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $6,121.76 | 8 total; 1 since its plan | |
| Farrell city | City | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $3,863.69 | 34 total; 6 since its plan | |
| Fredonia borough | Organized Borough | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $833.62 | 19 total; 2 since its plan | |
| Greenville borough | Organized Borough | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $27,227.97 | 61 total; 1 since its plan | |
| Grove City borough | Organized Borough | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $30,756.57 | 58 total; 13 since its plan | |
| Hermitage city | City | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 1 | $128,282.49 | 30 total; 7 since its plan | Includes $3,862.41 for declarations not counted as hazard incidents (DR-4506-PA). |
| Jackson Center borough | Organized Borough | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | no Public Assistance recorded | 16 total; 7 since its plan | |
| Jamestown borough | Organized Borough | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $35,238.68 | 35 total; 5 since its plan | |
| Mercer borough | Organized Borough | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 1 | no Public Assistance recorded | 74 total; 10 since its plan | |
| New Lebanon borough | Organized Borough | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $4,368.76 | 11 total; 0 since its plan | |
| Sandy Lake borough | Organized Borough | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | no Public Assistance recorded | 36 total; 4 since its plan | |
| Sharon city | City | Approved, expires 2028-03-19 | FMA RL 0, SRL 2; any 2 | $148,651.91 | 51 total; 4 since its plan | Includes $94,655.64 for declarations not counted as hazard incidents (DR-4506-PA). |
| Sharpsville borough | Organized Borough | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $23,341.78 | 27 total; 11 since its plan | |
| Sheakleyville borough | Organized Borough | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | no Public Assistance recorded | 7 total; 1 since its plan | |
| Stoneboro borough | Organized Borough | Approved, expires 2028-03-19 | FMA RL 0, SRL 1; any 1 | no Public Assistance recorded | 21 total; 3 since its plan | |
| West Middlesex borough | Organized Borough | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $57,131.84 | 19 total; 4 since its plan | |
| Wheatland borough | Organized Borough | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $2,362.64 | 6 total; 1 since its plan | |
| Coolspring township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 1 | $4,127.62 | 0 total; 0 since its plan | |
| Deer Creek township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $17,476.61 | 0 total; 0 since its plan | |
| Delaware township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $31,699.02 | 0 total; 0 since its plan | |
| East Lackawannock township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | no Public Assistance recorded | 0 total; 0 since its plan | |
| Fairview township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $10,598.31 | 4 total; 2 since its plan | |
| Findley township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $5,381.60 | 0 total; 0 since its plan | |
| French Creek township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 1 | $50,932.51 | 0 total; 0 since its plan | |
| Greene township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $30,643.67 | 0 total; 0 since its plan | |
| Hempfield township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 1 | $15,566.66 | 0 total; 0 since its plan | |
| Jackson township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | no Public Assistance recorded | 0 total; 0 since its plan | |
| Jefferson township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $32,687.91 | 0 total; 0 since its plan | |
| Lackawannock township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $3,895.16 | 0 total; 0 since its plan | |
| Lake township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | no Public Assistance recorded | 0 total; 0 since its plan | |
| Liberty township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $36,622.46 | 0 total; 0 since its plan | |
| Mill Creek township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | no Public Assistance recorded | 0 total; 0 since its plan | |
| New Vernon township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $24,930.14 | 5 total; 2 since its plan | |
| Otter Creek township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $21,636.21 | 0 total; 0 since its plan | |
| Perry township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $58,044.84 | 0 total; 0 since its plan | |
| Pine township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $14,225.50 | 0 total; 0 since its plan | |
| Pymatuning township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 2 | $7,708.16 | 0 total; 0 since its plan | |
| Salem township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $15,956.34 | 5 total; 1 since its plan | |
| Sandy Creek township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $60,837.60 | 0 total; 0 since its plan | |
| Sandy Lake township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | no Public Assistance recorded | 36 total; 4 since its plan | |
| Shenango township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $48,946.72 | 8 total; 4 since its plan | |
| South Pymatuning township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $37,227.22 | 0 total; 0 since its plan | |
| Springfield township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $21,248.82 | 0 total; 0 since its plan | |
| Sugar Grove township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $5,175.39 | 0 total; 0 since its plan | |
| West Salem township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 1 | $15,873.56 | 0 total; 0 since its plan | |
| Wilmington township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $8,297.12 | 0 total; 0 since its plan | |
| Wolf Creek township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | $6,242.54 | 0 total; 0 since its plan | |
| Worth township | Township | Approved, expires 2028-03-19 | FMA RL 0, SRL 0; any 0 | no Public Assistance recorded | 0 total; 0 since its plan |
Repetitive-loss counts are for whole NFIP communities, which can extend beyond this county (see the note in B2-c).
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.
No county-level plan row in FEMA data, so there is no approval date to count from.
- 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 plancounty-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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Cold Wave | $31,203,587,586 | $84,633,276 | 110,623 | $1,219 | $18,244 | $235,637 | under 0.0001% | ||||
| Drought | n/a | $0 | n/a | n/a | $0 | n/a | agriculture exposure is 0 in NRI | ||||
| Earthquake | $52,387,568,599 | n/a | 110,652 | $210,210 | n/a | $58,336 | 0.000401% | ||||
| Hail | $31,203,587,586 | $84,633,276 | 110,623 | $573,680 | $45,249 | $28,322 | 0.00184% | ||||
| Heat Wave | $31,203,587,586 | $84,633,276 | 110,623 | $6 | $2,044 | $108,353 | under 0.0001% | ||||
| Hurricane | $31,189,160,766 | $84,025,530 | 110,567 | $271,438 | $25,714 | $9,317 | 0.00087% | ||||
| Ice Storm | $31,130,235,737 | n/a | 110,127 | $23,751 | n/a | $29,558 | under 0.0001% | ||||
| Inland Flooding | $31,177,952,273 | $1,136,630 | 1,362 | $29,006,613 | $24,355 | $28,640 | n/a (see note) | 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 | $395,953,065 | n/a | 1,461 | $241 | n/a | $496 | under 0.0001% | ||||
| Lightning | $31,203,587,586 | n/a | 110,623 | $9,514 | n/a | $916,982 | under 0.0001% | ||||
| Strong Wind | $31,203,587,586 | $84,633,276 | 110,623 | $522,702 | $2,699 | $455,104 | 0.00168% | ||||
| Tornado | $31,203,587,586 | $84,633,276 | 110,623 | $980,065 | $2,310 | $356,343 | 0.00314% | ||||
| Wildfire | $8,072,437,439 | $23,252,277 | 29,458 | $16,481 | $11 | $2,197 | 0.000204% | ||||
| Winter Weather | $31,203,587,586 | $84,633,276 | 110,623 | $136,943 | $43 | $31,086 | 0.000439% |
Totals since the plan: not available. No county-level plan row in FEMA data, so there is no approval date to count from.
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 | 110,623 |
| Building value (total, not at risk) | $31,203,587,586 |
| Agriculture value (total, not at risk) | $84,633,276 |
| NRI risk rating (all hazards) | Relatively Low |
| Expected annual loss, buildings and agriculture, all hazards | $31,873,529 |
| 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) | $2,260,373 |
| Social vulnerability rating | Relatively Moderate |
| Community resilience rating | Relatively High |
| 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) | 0 | Severe repetitive loss, FMA definition (44 CFR 77.2) | 3 |
| Repetitive loss, NFIP insurance definition | 11 | 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 | 0 | 3 | 11 | 3 | 11 | 0 | 1 |
| of which: Mercer borough | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
| of which: Sharon city | 0 | 2 | 2 | 2 | 2 | 0 | 0 |
| of which: Stoneboro borough | 0 | 1 | 1 | 1 | 1 | 0 | 0 |
| of which: Hermitage city | 0 | 0 | 1 | 0 | 1 | 0 | 1 |
| of which: Coolspring township | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
| of which: French Creek township | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
| of which: Hempfield township | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
| of which: Pymatuning township | 0 | 0 | 2 | 0 | 2 | 0 | 0 |
| of which: West Salem township | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
| Statewide, no county in FEMA's file | 0 | 0 | 1 | 0 | 1 | 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 |
|---|---|---|---|---|---|---|---|---|
| Clark borough | 422475 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Farrell city | 420673 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Fredonia borough | 422477 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Greenville borough | 420674 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Grove City borough | 420675 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Hermitage city | 421862 | 0 | 0 | 1 | 0 | 1 | 0 | 1 |
| Jackson Center borough | 422479 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Jamestown borough | 422481 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Mercer borough | 420676 | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
| New Lebanon borough | 422484 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Sandy Lake borough | 420677 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Sharon city | 420678 | 0 | 2 | 2 | 2 | 2 | 0 | 0 |
| Sharpsville borough | 420682 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Sheakleyville borough | 422715 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Stoneboro borough | 420679 | 0 | 1 | 1 | 1 | 1 | 0 | 0 |
| West Middlesex borough | 420680 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Wheatland borough | 420681 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Coolspring township | 421863 | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
| Deer Creek township | 422476 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Delaware township | 422283 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| East Lackawannock township | 421864 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Fairview township | 421865 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Findley township | 421866 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| French Creek township | 421867 | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
| Greene township | 422478 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Hempfield township | 421868 | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
| Jackson township | 422480 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Jefferson township | 421869 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Lackawannock township | 422482 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Lake township | 422483 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Liberty township | 421870 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Mill Creek township | 421871 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| New Vernon township | 422485 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Otter Creek township | 422486 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Perry township | 422487 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Pine township | 422284 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Pymatuning township | 422285 | 0 | 0 | 2 | 0 | 2 | 0 | 0 |
| Salem township | 421872 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Sandy Creek township | 421873 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Sandy Lake township | 421874 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Shenango township | 421875 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| South Pymatuning township | 421876 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Springfield township | 421877 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Sugar Grove township | 422489 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| West Salem township | 422490 | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
| Wilmington township | 421878 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Wolf Creek township | 422491 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Worth township | 422492 | 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 | 0 | 1 | 7 | 1 | 7 | 0 | 0 |
| 2 to 4 unit residential | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| other residential | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| non-residential | 0 | 2 | 4 | 2 | 4 | 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 11 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 (the summary on page 1 says how it is organized); the plan and FEMA's review decide whether each 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). Mercer County, PA: risk-assessment baseline packet, release 2026-10 (data as of 2026-09-30; County FIPS 42085). Automated baseline. https://hazardplain.org/pa/42085/ 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: contact@hazardplain.org