In 2025, fire departments serving St. Charles County responded to 1,919 fire and hazmat incidents — including a single $1.5M property loss. FEMA NRI rates wildfire risk here as Moderate.
Gas leak (natural gas or LPG) lead by count. Top five categories make up about 47% of all calls.
Mar peaks. Dec dips.
10,297 incidents from 2021 through 2025.
| Year | Incidents | |
|---|---|---|
| 2021 | 2,340 | |
| 2022 | 2,132 | |
| 2023 | 2,005 | |
| 2024 | 1,901 | |
| 2025 | 1,919 |
For the 193 building fires departments responded to in 2025, here's how investigators classified them.
Largest single-incident property losses in St. Charles County during 2025. These 10 fires alone account for 60% of the county's total.
| # | Property loss | City | Type | Severity |
|---|---|---|---|---|
| 1 | $1,500,000 | Ofallon | Building fires | Major |
| 2 | $750,000 | St Charles | Building fires | Major |
| 3 | $650,000 | Wentzville | Building fires | Major |
| 4 | $600,000 | Augusta | Building fires | Major |
| 5 | $500,000 | Wentzville | Building fires | Major |
| 6 | $417,773 | Ofallon | Building fires | Major |
| 7 | $400,000 | Ofallon | Building fires | Major |
| 8 | $363,841 | Augusta | Building fires | Major |
| 9 | $350,000 | OFallon | Building fires | Major |
| 10 | $300,000 | Wentzville | Building fires | Major |
Per-capita rates let us compare apples to apples.
12 cities mapped to FIPS 29183.
| City | Population | |
|---|---|---|
| O'Fallon | 91,825 | View › |
| St. Charles | 70,687 | View › |
| St. Peters | 57,692 | View › |
| Wentzville | 44,584 | View › |
| Lake St. Louis | 17,088 | View › |
| Dardenne Prairie | 12,903 | View › |
| Cottleville | 5,584 | View › |
| Weldon Spring | 5,320 | View › |
| St. Paul | 3,149 | View › |
| Flint Hill | 1,041 | View › |
| Foristell | 750 | View › |
| Josephville | 728 | View › |
7 departments report from this county.
Top 10 fire perimeters by acres burned (state-scoped fallback while we build out per-county polygons).
| # | Name | Year | Agency | Acres |
|---|---|---|---|---|
| 1 | Minninghaw | 2011 | USFS | 4,762 |
| 2 | Mud Pond | 2011 | USFS | 3,520 |
| 3 | Willie | 2020 | USFS | 2,472 |
| 4 | 23 Thorny Creek BIL RX | 2023 | NPS | 2,223 |
| 5 | Carty | 2015 | USFS | 2,145 |
| 6 | Swan Creek | 2019 | USFS | 2,119 |
| 7 | Rozell | 2018 | USFS | 2,102 |
| 8 | Devreaux | 2023 | USFS | 2,028 |
| 9 | Liberty | 2012 | USFS | 1,623 |
| 10 | Sugar | 2024 | USFS | 1,611 |
County-level NFIRS aggregates for 2025, plus 5-year totals across 2021–2025. NFIRS is voluntary — about 23,000 of roughly 30,000 US fire departments report — so totals are a strong indicator, not a complete census. Wildfire risk score (0–100) and Expected Annual Loss come from FEMA's National Risk Index. Drought class is the most recent USDM classification (D0 = abnormally dry through D4 = exceptional drought). Historical fire perimeters are sourced from the NIFC InterAgency Fire Perimeter History.