ZIP 91710 recorded 294 fire and hazmat incidents in 2025, 1,406 across 2021–2025. Primary county: San Bernardino County, CA. FEMA NRI rates wildfire risk here as Very High.
1,406 incidents from 2021 through 2025 inside this ZIP.
| Year | Incidents | |
|---|---|---|
| 2021 | 229 | |
| 2022 | 320 | |
| 2023 | 262 | |
| 2024 | 301 | |
| 2025 | 294 |
Jul peaks. Dec dips. Aggregated across all 5 years inside this ZIP.
Top 5 NFIRS incident types for ZIP 91710 across 2021–2025.
| # | Incident type | Count | Share | |
|---|---|---|---|---|
| 1 | Electrical wiring/equipment problem, other | 183 | 13.0% | |
| 2 | Outside rubbish fire, other | 124 | 8.8% | |
| 3 | Passenger vehicle fire | 109 | 7.8% | |
| 4 | Outside rubbish, trash or waste fire | 103 | 7.3% | |
| 5 | Gas leak (natural gas or LPG) | 81 | 5.8% |
For the 16 building fires reported here in 2025, here's how investigators classified ignition cause.
NFIRS Area of Origin for ZIP 91710 fires across 2021–2025.
| # | Area of origin | Count | Share | |
|---|---|---|---|---|
| 1 | Engine area, running gear, wheel area | 90 | 29.1% | |
| 2 | Undetermined | 90 | 29.1% | |
| 3 | Outside area, other | 14 | 4.5% | |
| 4 | Vehicle storage area; garage, carport | 13 | 4.2% | |
| 5 | Cooking area, kitchen | 11 | 3.6% | |
| 6 | Vehicle area, other | 10 | 3.2% | |
| 7 | Operator/passenger area of transportation equip. | 10 | 3.2% | |
| 8 | Other | 7 | 2.3% | |
| 9 | All other areas | 64 | 20.7% |
NFIRS HEAT_SOURC code — the physical thing that started the fire.
| # | Heat source | Count | Share | |
|---|---|---|---|---|
| 1 | Undetermined | 175 | 56.6% | |
| 2 | Heat from powered equipment, other | 35 | 11.3% | |
| 3 | Heat source: other | 21 | 6.8% | |
| 4 | Arcing | 20 | 6.5% | |
| 5 | Spark, ember or flame from operating equipment | 12 | 3.9% | |
| 6 | Radiated, conducted heat from operating equipment | 6 | 1.9% | |
| 7 | Hot or smoldering object, other | 6 | 1.9% | |
| 8 | Heat from other open flame or smoking materials | 5 | 1.6% | |
| 9 | All other sources | 29 | 9.4% |
Largest single-incident losses in ZIP 91710 across 2021–2025. These 8 fires alone account for 2551% of the ZIP's 2025 reported total.
| # | Property loss | Type | Year | Severity |
|---|---|---|---|---|
| 1 | $8,000,000 | Building fires | 2024 | Catastrophic |
| 2 | $2,000,000 | Building fires | 2022 | Major |
| 3 | $1,000,000 | Building fires | 2022 | Major |
| 4 | $1,000,000 | Building fires | 2023 | Major |
| 5 | $600,000 | Building fires | 2024 | Major |
| 6 | $300,000 | Building fires | 2023 | Major |
| 7 | $250,000 | Building fires | 2022 | Major |
| 8 | $250,000 | Building fires | 2024 | Major |
Some ZIPs span multiple cities. Ranked by 5-yr NFIRS incidents inside ZIP 91710.
| # | City | 5-yr incidents | |
|---|---|---|---|
| 1 | Chino | 1,256 | |
| 2 | Chino Hills | 16 | |
| 3 | Pomona | 5 | |
| 4 | Montclair | 4 | |
| 5 | Ontario | 2 |
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 — 1,406 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.