ZIP 37421 recorded 360 fire and hazmat incidents in 2025, 1,598 across 2021–2025. Primary county: Hamilton County, TN. FEMA NRI rates wildfire risk here as High.
1,598 incidents from 2021 through 2025 inside this ZIP.
| Year | Incidents | |
|---|---|---|
| 2021 | 312 | |
| 2022 | 314 | |
| 2023 | 297 | |
| 2024 | 315 | |
| 2025 | 360 |
Jul peaks. Feb dips. Aggregated across all 5 years inside this ZIP.
Top 5 NFIRS incident types for ZIP 37421 across 2021–2025.
| # | Incident type | Count | Share | |
|---|---|---|---|---|
| 1 | Power line down | 216 | 13.5% | |
| 2 | Gas leak (natural gas or LPG) | 167 | 10.5% | |
| 3 | Brush, or brush and grass mixture fire | 143 | 8.9% | |
| 4 | Building fires | 134 | 8.4% | |
| 5 | Passenger vehicle fire | 121 | 7.6% |
For the 33 building fires reported here in 2025, here's how investigators classified ignition cause.
NFIRS Area of Origin for ZIP 37421 fires across 2021–2025.
| # | Area of origin | Count | Share | |
|---|---|---|---|---|
| 1 | Engine area, running gear, wheel area | 97 | 14.6% | |
| 2 | Outside area, other | 92 | 13.8% | |
| 3 | Open area - outside; included are farmland, field | 72 | 10.8% | |
| 4 | Undetermined | 71 | 10.7% | |
| 5 | Wildland, woods | 51 | 7.7% | |
| 6 | Cooking area, kitchen | 46 | 6.9% | |
| 7 | Highway, parking lot, street: on or near | 39 | 5.9% | |
| 8 | Courtyard, patio, porch, terrace | 16 | 2.4% | |
| 9 | All other areas | 182 | 27.3% |
NFIRS HEAT_SOURC code — the physical thing that started the fire.
| # | Heat source | Count | Share | |
|---|---|---|---|---|
| 1 | Undetermined | 263 | 39.5% | |
| 2 | Hot or smoldering object, other | 85 | 12.8% | |
| 3 | Hot ember or ash | 56 | 8.4% | |
| 4 | Radiated, conducted heat from operating equipment | 39 | 5.9% | |
| 5 | Arcing | 37 | 5.6% | |
| 6 | Heat from powered equipment, other | 35 | 5.3% | |
| 7 | Cigarette lighter | 19 | 2.9% | |
| 8 | Heat from other open flame or smoking materials | 17 | 2.6% | |
| 9 | All other sources | 115 | 17.3% |
Largest single-incident losses in ZIP 37421 across 2021–2025. These 8 fires alone account for 304% of the ZIP's 2025 reported total.
| # | Property loss | Type | Year | Severity |
|---|---|---|---|---|
| 1 | $1,500,000 | Building fires | 2023 | Major |
| 2 | $500,000 | Building fires | 2022 | Major |
| 3 | $450,000 | Building fires | 2024 | Major |
| 4 | $400,000 | Building fires | 2024 | Major |
| 5 | $360,000 | Building fires | 2021 | Major |
| 6 | $349,100 | Building fires | 2025 | Major |
| 7 | $346,650 | Building fires | 2022 | Major |
| 8 | $279,000 | Building fires | 2024 | Major |
Some ZIPs span multiple cities. Ranked by 5-yr NFIRS incidents inside ZIP 37421.
| # | City | 5-yr incidents | |
|---|---|---|---|
| 1 | Chattanooga | 1,522 | |
| 2 | East Ridge | 7 | |
| 3 | Rossville | 1 |
The figures above are historical. For today's air quality, fire-weather warnings, and active fires, go to the official sources.
NFIRS reports each fire incident with a 5-digit address ZIP. We aggregate those rows directly to produce ZIP-level totals — 1,598 incidents in this ZIP across 2021–2025. Building-fire breakdowns (Area of Origin, Heat Source, ignition cause) only count fires investigators classified beyond the basic incident report. Because NFIRS reporting is voluntary, totals are a strong indicator rather than a complete census.