ZIP 94503 recorded 85 fire and hazmat incidents in 2025, 471 across 2021–2025. Primary county: Napa County, CA. FEMA NRI rates wildfire risk here as Very High.
471 incidents from 2021 through 2025 inside this ZIP.
| Year | Incidents | |
|---|---|---|
| 2021 | 75 | |
| 2022 | 109 | |
| 2023 | 108 | |
| 2024 | 94 | |
| 2025 | 85 |
Aug peaks. Mar dips. Aggregated across all 5 years inside this ZIP.
Top 5 NFIRS incident types for ZIP 94503 across 2021–2025.
| # | Incident type | Count | Share | |
|---|---|---|---|---|
| 1 | Gas leak (natural gas or LPG) | 45 | 9.6% | |
| 2 | Building fires | 43 | 9.1% | |
| 3 | Outside rubbish, trash or waste fire | 42 | 8.9% | |
| 4 | Passenger vehicle fire | 37 | 7.9% | |
| 5 | Power line down | 32 | 6.8% |
For the 5 building fires reported here in 2025, here's how investigators classified ignition cause.
NFIRS Area of Origin for ZIP 94503 fires across 2021–2025.
| # | Area of origin | Count | Share | |
|---|---|---|---|---|
| 1 | Engine area, running gear, wheel area | 26 | 21.3% | |
| 2 | Undetermined | 20 | 16.4% | |
| 3 | Cooking area, kitchen | 10 | 8.2% | |
| 4 | Open area - outside; included are farmland, field | 10 | 8.2% | |
| 5 | Outside area, other | 9 | 7.4% | |
| 6 | Bedroom - < 5 persons; included are jail or prison | 6 | 4.9% | |
| 7 | Vehicle storage area; garage, carport | 4 | 3.3% | |
| 8 | Vehicle area, other | 4 | 3.3% | |
| 9 | All other areas | 33 | 27.0% |
NFIRS HEAT_SOURC code — the physical thing that started the fire.
| # | Heat source | Count | Share | |
|---|---|---|---|---|
| 1 | Undetermined | 70 | 57.4% | |
| 2 | Arcing | 8 | 6.6% | |
| 3 | Radiated, conducted heat from operating equipment | 7 | 5.7% | |
| 4 | Heat from powered equipment, other | 6 | 4.9% | |
| 5 | Spark, ember or flame from operating equipment | 6 | 4.9% | |
| 6 | Hot or smoldering object, other | 4 | 3.3% | |
| 7 | Hot ember or ash | 4 | 3.3% | |
| 8 | Heat source: other | 3 | 2.5% | |
| 9 | All other sources | 14 | 11.5% |
Largest single-incident losses in ZIP 94503 across 2021–2025. These 8 fires alone account for 225% of the ZIP's 2025 reported total.
| # | Property loss | Type | Year | Severity |
|---|---|---|---|---|
| 1 | $500,000 | Building fires | 2025 | Major |
| 2 | $325,000 | Building fires | 2024 | Major |
| 3 | $300,000 | Building fires | 2024 | Major |
| 4 | $250,000 | Off-road vehicle or heavy equipment fire | 2022 | Major |
| 5 | $235,400 | Building fires | 2022 | Significant |
| 6 | $150,000 | Off-road vehicle or heavy equipment fire | 2023 | Significant |
| 7 | $150,000 | Building fires | 2025 | Significant |
| 8 | $100,000 | Garbage dump or sanitary landfill fire | 2024 | Significant |
Some ZIPs span multiple cities. Ranked by 5-yr NFIRS incidents inside ZIP 94503.
| # | City | 5-yr incidents | |
|---|---|---|---|
| 1 | American Canyon | 155 | |
| 2 | Vallejo | 36 | |
| 3 | Fairfield | 1 | |
| 4 | Oakland | 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 — 471 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.