ZIP 91748 recorded 107 fire and hazmat incidents in 2025, 558 across 2021–2025. Primary county: Los Angeles County, CA. FEMA NRI rates wildfire risk here as Very High.
558 incidents from 2021 through 2025 inside this ZIP.
| Year | Incidents | |
|---|---|---|
| 2021 | 107 | |
| 2022 | 102 | |
| 2023 | 123 | |
| 2024 | 119 | |
| 2025 | 107 |
Aug peaks. Jan dips. Aggregated across all 5 years inside this ZIP.
Top 5 NFIRS incident types for ZIP 91748 across 2021–2025.
| # | Incident type | Count | Share | |
|---|---|---|---|---|
| 1 | Outside rubbish fire, other | 75 | 13.4% | |
| 2 | Outside rubbish, trash or waste fire | 66 | 11.8% | |
| 3 | Trash or rubbish fire, contained | 64 | 11.5% | |
| 4 | Passenger vehicle fire | 39 | 7.0% | |
| 5 | Dumpster or other outside trash receptacle fire | 36 | 6.5% |
For the 4 building fires reported here in 2025, here's how investigators classified ignition cause.
NFIRS Area of Origin for ZIP 91748 fires across 2021–2025.
| # | Area of origin | Count | Share | |
|---|---|---|---|---|
| 1 | Engine area, running gear, wheel area | 35 | 25.0% | |
| 2 | Other | 17 | 12.1% | |
| 3 | Vehicle area, other | 15 | 10.7% | |
| 4 | Undetermined | 10 | 7.1% | |
| 5 | Outside area, other | 7 | 5.0% | |
| 6 | Cargo/trunk area - all vehicles | 6 | 4.3% | |
| 7 | Cooking area, kitchen | 5 | 3.6% | |
| 8 | Operator/passenger area of transportation equip. | 5 | 3.6% | |
| 9 | All other areas | 40 | 28.6% |
NFIRS HEAT_SOURC code — the physical thing that started the fire.
| # | Heat source | Count | Share | |
|---|---|---|---|---|
| 1 | Heat source: other | 38 | 27.1% | |
| 2 | Heat from powered equipment, other | 25 | 17.9% | |
| 3 | Undetermined | 18 | 12.9% | |
| 4 | Radiated, conducted heat from operating equipment | 13 | 9.3% | |
| 5 | Arcing | 11 | 7.9% | |
| 6 | Hot or smoldering object, other | 11 | 7.9% | |
| 7 | Spark, ember or flame from operating equipment | 4 | 2.9% | |
| 8 | Hot ember or ash | 4 | 2.9% | |
| 9 | All other sources | 16 | 11.4% |
Largest single-incident losses in ZIP 91748 across 2021–2025. These 8 fires alone account for 823% of the ZIP's 2025 reported total.
| # | Property loss | Type | Year | Severity |
|---|---|---|---|---|
| 1 | $1,132,000 | Rail vehicle fire | 2024 | Major |
| 2 | $1,000,000 | Building fires | 2021 | Major |
| 3 | $460,000 | Fire in motor home, camper, recreational vehicle | 2024 | Major |
| 4 | $300,000 | Building fires | 2021 | Major |
| 5 | $300,000 | Building fires | 2023 | Major |
| 6 | $250,000 | Building fires | 2024 | Major |
| 7 | $200,000 | Outside storage fire | 2025 | Significant |
| 8 | $116,000 | Road freight or transport vehicle fire | 2021 | Significant |
Some ZIPs span multiple cities. Ranked by 5-yr NFIRS incidents inside ZIP 91748.
| # | City | 5-yr incidents | |
|---|---|---|---|
| 1 | Rowland Heights | 327 | |
| 2 | Hacienda Heights | 25 | |
| 3 | Diamond Bar | 3 |
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 — 558 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.