ZIP 01803 recorded 36 fire and hazmat incidents in 2025, 830 across 2021–2025. Primary county: Middlesex County, MA. FEMA NRI rates wildfire risk here as High.
830 incidents from 2021 through 2025 inside this ZIP.
| Year | Incidents | |
|---|---|---|
| 2021 | 176 | |
| 2022 | 209 | |
| 2023 | 197 | |
| 2024 | 212 | |
| 2025 | 36 |
May peaks. Sep dips. Aggregated across all 5 years inside this ZIP.
Top 5 NFIRS incident types for ZIP 01803 across 2021–2025.
| # | Incident type | Count | Share | |
|---|---|---|---|---|
| 1 | Natural vegetation fire, other | 150 | 18.1% | |
| 2 | Gas leak (natural gas or LPG) | 144 | 17.3% | |
| 3 | Electrical wiring/equipment problem, other | 128 | 15.4% | |
| 4 | Unauthorized burning | 44 | 5.3% | |
| 5 | Brush, or brush and grass mixture fire | 38 | 4.6% |
For the 3 building fires reported here in 2025, here's how investigators classified ignition cause.
NFIRS Area of Origin for ZIP 01803 fires across 2021–2025.
| # | Area of origin | Count | Share | |
|---|---|---|---|---|
| 1 | Outside area, other | 125 | 41.9% | |
| 2 | Vehicle area, other | 34 | 11.4% | |
| 3 | Undetermined | 23 | 7.7% | |
| 4 | Engine area, running gear, wheel area | 21 | 7.0% | |
| 5 | Cooking area, kitchen | 17 | 5.7% | |
| 6 | Wildland, woods | 15 | 5.0% | |
| 7 | Highway, parking lot, street: on or near | 11 | 3.7% | |
| 8 | Open area - outside; included are farmland, field | 8 | 2.7% | |
| 9 | All other areas | 44 | 14.8% |
NFIRS HEAT_SOURC code — the physical thing that started the fire.
| # | Heat source | Count | Share | |
|---|---|---|---|---|
| 1 | Undetermined | 138 | 46.3% | |
| 2 | Cigarette | 89 | 29.9% | |
| 3 | Heat from powered equipment, other | 17 | 5.7% | |
| 4 | Heat source: other | 13 | 4.4% | |
| 5 | Hot or smoldering object, other | 8 | 2.7% | |
| 6 | Arcing | 7 | 2.3% | |
| 7 | Hot ember or ash | 5 | 1.7% | |
| 8 | Spark, ember or flame from operating equipment | 4 | 1.3% | |
| 9 | All other sources | 17 | 5.7% |
Largest single-incident losses in ZIP 01803 across 2021–2025. These 8 fires alone account for 0% of the ZIP's 2025 reported total.
| # | Property loss | Type | Year | Severity |
|---|---|---|---|---|
| 1 | $525,000 | Building fires | 2023 | Major |
| 2 | $500,000 | Building fires | 2023 | Major |
| 3 | $100,000 | Building fires | 2022 | Significant |
| 4 | $75,000 | Building fires | 2023 | Significant |
| 5 | $30,000 | Passenger vehicle fire | 2022 | Significant |
| 6 | $25,000 | Building fires | 2021 | Significant |
| 7 | $20,000 | Building fires | 2021 | Significant |
| 8 | $12,000 | Passenger vehicle fire | 2022 | Significant |
Some ZIPs span multiple cities. Ranked by 5-yr NFIRS incidents inside ZIP 01803.
| # | City | 5-yr incidents | |
|---|---|---|---|
| 1 | Burlington | 827 | |
| 2 | Bedford | 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 — 830 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.