ZIP 02421 recorded 30 fire and hazmat incidents in 2025, 191 across 2021–2025. Primary county: Middlesex County, MA. FEMA NRI rates wildfire risk here as High.
191 incidents from 2021 through 2025 inside this ZIP.
| Year | Incidents | |
|---|---|---|
| 2021 | 38 | |
| 2022 | 42 | |
| 2023 | 38 | |
| 2024 | 43 | |
| 2025 | 30 |
Mar peaks. Feb dips. Aggregated across all 5 years inside this ZIP.
Top 5 NFIRS incident types for ZIP 02421 across 2021–2025.
| # | Incident type | Count | Share | |
|---|---|---|---|---|
| 1 | Passenger vehicle fire | 42 | 22.0% | |
| 2 | Building fires | 34 | 17.8% | |
| 3 | Brush, or brush and grass mixture fire | 25 | 13.1% | |
| 4 | Cooking fire, confined to container | 17 | 8.9% | |
| 5 | Carbon monoxide incident | 15 | 7.9% |
For the 2 building fires reported here in 2025, here's how investigators classified ignition cause.
NFIRS Area of Origin for ZIP 02421 fires across 2021–2025.
| # | Area of origin | Count | Share | |
|---|---|---|---|---|
| 1 | Engine area, running gear, wheel area | 34 | 28.6% | |
| 2 | Outside area, other | 17 | 14.3% | |
| 3 | Cooking area, kitchen | 9 | 7.6% | |
| 4 | Wildland, woods | 9 | 7.6% | |
| 5 | Highway, parking lot, street: on or near | 7 | 5.9% | |
| 6 | Open area - outside; included are farmland, field | 7 | 5.9% | |
| 7 | Bedroom - < 5 persons; included are jail or prison | 5 | 4.2% | |
| 8 | Vehicle area, other | 4 | 3.4% | |
| 9 | All other areas | 27 | 22.7% |
NFIRS HEAT_SOURC code — the physical thing that started the fire.
| # | Heat source | Count | Share | |
|---|---|---|---|---|
| 1 | Undetermined | 37 | 31.1% | |
| 2 | Heat from powered equipment, other | 26 | 21.8% | |
| 3 | Radiated, conducted heat from operating equipment | 14 | 11.8% | |
| 4 | Hot or smoldering object, other | 10 | 8.4% | |
| 5 | Arcing | 7 | 5.9% | |
| 6 | Cigarette lighter | 4 | 3.4% | |
| 7 | Spark, ember or flame from operating equipment | 3 | 2.5% | |
| 8 | Heat from other open flame or smoking materials | 3 | 2.5% | |
| 9 | All other sources | 15 | 12.6% |
Largest single-incident losses in ZIP 02421 across 2021–2025. These 8 fires alone account for 2759% of the ZIP's 2025 reported total.
| # | Property loss | Type | Year | Severity |
|---|---|---|---|---|
| 1 | $500,000 | Building fires | 2023 | Major |
| 2 | $250,000 | Building fires | 2024 | Major |
| 3 | $200,000 | Building fires | 2024 | Significant |
| 4 | $75,000 | Building fires | 2024 | Significant |
| 5 | $50,000 | Building fires | 2021 | Significant |
| 6 | $43,000 | Passenger vehicle fire | 2021 | Significant |
| 7 | $41,700 | Passenger vehicle fire | 2021 | Significant |
| 8 | $37,884 | Passenger vehicle fire | 2021 | Significant |
Some ZIPs span multiple cities. Ranked by 5-yr NFIRS incidents inside ZIP 02421.
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 — 191 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.