ZIP 77521 recorded 384 fire and hazmat incidents in 2025, 2,113 across 2021–2025. Primary county: Harris County, TX. FEMA NRI rates wildfire risk here as Very High.
2,113 incidents from 2021 through 2025 inside this ZIP.
| Year | Incidents | |
|---|---|---|
| 2021 | 401 | |
| 2022 | 268 | |
| 2023 | 500 | |
| 2024 | 560 | |
| 2025 | 384 |
Jul peaks. Dec dips. Aggregated across all 5 years inside this ZIP.
Top 5 NFIRS incident types for ZIP 77521 across 2021–2025.
| # | Incident type | Count | Share | |
|---|---|---|---|---|
| 1 | Gas leak (natural gas or LPG) | 336 | 15.9% | |
| 2 | Outside rubbish, trash or waste fire | 257 | 12.2% | |
| 3 | Power line down | 239 | 11.3% | |
| 4 | Building fires | 204 | 9.7% | |
| 5 | Passenger vehicle fire | 167 | 7.9% |
For the 35 building fires reported here in 2025, here's how investigators classified ignition cause.
NFIRS Area of Origin for ZIP 77521 fires across 2021–2025.
| # | Area of origin | Count | Share | |
|---|---|---|---|---|
| 1 | Engine area, running gear, wheel area | 130 | 17.2% | |
| 2 | Open area - outside; included are farmland, field | 121 | 16.0% | |
| 3 | Undetermined | 108 | 14.3% | |
| 4 | Outside area, other | 46 | 6.1% | |
| 5 | Cooking area, kitchen | 43 | 5.7% | |
| 6 | Highway, parking lot, street: on or near | 32 | 4.2% | |
| 7 | Bedroom - < 5 persons; included are jail or prison | 25 | 3.3% | |
| 8 | Chute/container - trash, rubbish, waste | 24 | 3.2% | |
| 9 | All other areas | 226 | 29.9% |
NFIRS HEAT_SOURC code — the physical thing that started the fire.
| # | Heat source | Count | Share | |
|---|---|---|---|---|
| 1 | Undetermined | 335 | 44.4% | |
| 2 | Arcing | 95 | 12.6% | |
| 3 | Radiated, conducted heat from operating equipment | 60 | 7.9% | |
| 4 | Cigarette lighter | 36 | 4.8% | |
| 5 | Hot ember or ash | 34 | 4.5% | |
| 6 | Spark, ember or flame from operating equipment | 32 | 4.2% | |
| 7 | Heat from powered equipment, other | 24 | 3.2% | |
| 8 | Cigarette | 18 | 2.4% | |
| 9 | All other sources | 121 | 16.0% |
Largest single-incident losses in ZIP 77521 across 2021–2025. These 8 fires alone account for 220% of the ZIP's 2025 reported total.
| # | Property loss | Type | Year | Severity |
|---|---|---|---|---|
| 1 | $1,000,000 | Building fires | 2022 | Major |
| 2 | $500,000 | Building fires | 2021 | Major |
| 3 | $250,000 | Building fires | 2021 | Major |
| 4 | $170,000 | Road freight or transport vehicle fire | 2024 | Significant |
| 5 | $161,174 | Building fires | 2024 | Significant |
| 6 | $150,000 | Road freight or transport vehicle fire | 2022 | Significant |
| 7 | $150,000 | Building fires | 2025 | Significant |
| 8 | $147,083 | Building fires | 2024 | Significant |
Some ZIPs span multiple cities. Ranked by 5-yr NFIRS incidents inside ZIP 77521.
| # | City | 5-yr incidents | |
|---|---|---|---|
| 1 | Baytown | 2,095 | |
| 2 | Mont Belvieu | 7 | |
| 3 | Highlands | 3 | |
| 4 | Crosby | 1 | |
| 5 | La Feria | 1 |
Some ZIPs span multiple counties. The primary above is the largest by population weight; secondary counties are below.
| County | State | Weight | |
|---|---|---|---|
| Chambers County | TX | 0.50 | FIPS 48071 |
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 — 2,113 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.