In 2025, fire departments serving Bolton responded to 70 fire and hazmat incidents — from cooking fires to gas leaks to a single $200K building blaze. Here's the full picture.
Building fires lead by count. Building fires lead by dollars. Together the top five categories make up about 47% of all calls.
Mar peaks. Jun dips. Watch for the typical fall climb starting in October.
315 incidents 2021–2025. Peak year was 2023. $1.0M cumulative property loss.
| Year | Incidents | YoY | |
|---|---|---|---|
| 2021 | 78 | — | |
| 2022* | 37 | — | |
| 2023 | 89 | — | |
| 2024 | 41 | -53.9% | |
| 2025 | 70 | +70.7% |
* Well below Bolton's usual volume. That almost always means one or more departments didn't submit a full year to NFIRS, not that fires dropped, so no year-over-year change is shown for it.
For the 10 building fires Bolton departments responded to in 2025, here's how they were classified once investigators were finished.
NFIRS Area of Origin (AREA_ORIG) for the 80 building fires investigators classified across 2021–2025. The room or location where ignition occurred — kitchens, bedrooms, exterior, vehicle areas — tells you where to focus prevention.
| # | Area of origin | Count | Share | |
|---|---|---|---|---|
| 1 | Engine area, running gear, wheel area | 18 | 22.5% | |
| 2 | Undetermined | 10 | 12.5% | |
| 3 | Outside area, other | 9 | 11.2% | |
| 4 | Other | 8 | 10.0% | |
| 5 | Vehicle area, other | 7 | 8.8% | |
| 6 | Cooking area, kitchen | 6 | 7.5% | |
| 7 | Chute/container - trash, rubbish, waste | 3 | 3.8% | |
| 8 | Open area - outside; included are farmland, field | 3 | 3.8% | |
| 9 | Corridor, mall | 2 | 2.5% | |
| 10 | Bathroom, checkroom, lavatory, locker room | 2 | 2.5% | |
| 11 | All other areas | 12 | 15.0% |
NFIRS Heat Source (HEAT_SOURC) — the physical thing that started it. Spark or ember from operating equipment, an open flame, smoking materials, or hot embers from a fireplace are the leading culprits nationwide. Here's the Bolton mix.
| # | Heat source | Count | Share | |
|---|---|---|---|---|
| 1 | Undetermined | 21 | 26.2% | |
| 2 | Heat source: other | 15 | 18.8% | |
| 3 | Heat from powered equipment, other | 14 | 17.5% | |
| 4 | Radiated, conducted heat from operating equipment | 8 | 10.0% | |
| 5 | Hot ember or ash | 7 | 8.8% | |
| 6 | Arcing | 4 | 5.0% | |
| 7 | Hot or smoldering object, other | 3 | 3.8% | |
| 8 | Heat, spark from friction | 2 | 2.5% | |
| 9 | Heat from other open flame or smoking materials | 2 | 2.5% | |
| 10 | Spark, ember or flame from operating equipment | 1 | 1.2% | |
| 11 | All other sources | 3 | 3.8% |
Largest single-incident property losses reported by Bolton departments in 2025. These 8 fires alone account for 97% of the city's annual total.
| # | Property loss | Type | Severity | Status |
|---|---|---|---|---|
| 1 | $200,000 | Building fires | Significant | Investigated |
| 2 | $100,000 | Building fires | Significant | Investigated |
| 3 | $50,000 | Passenger vehicle fire | Significant | Investigated |
| 4 | $12,000 | Brush, or brush and grass mixture fire | Significant | Investigated |
| 5 | $10,000 | Mobile property (vehicle) fire, other | Significant | Investigated |
| 6 | $10,000 | Building fires | Significant | Investigated |
| 7 | $10,000 | Passenger vehicle fire | Significant | Investigated |
| 8 | $5,000 | Road freight or transport vehicle fire | Significant | Investigated |
Per-capita rates let us compare apples to apples. Bolton sits above the national average for incidents per resident.
Top 25 wildfires (1992+) in the FPA-FOD ignitions database, scaled by acres. 4,214 acres burned in this 50-mile radius. Each dot is a fire — bigger dots burned more land.
| Year | Cause | Acres | Distance | |
|---|---|---|---|---|
| 2005 | Missing data/not specified/undetermined | 800 | 4.5 mi | |
| 2008 | Missing data/not specified/undetermined | 700 | 4.5 mi | |
| 2003 | Missing data/not specified/undetermined | 300 | 24.3 mi | |
| 2002 | Missing data/not specified/undetermined | 300 | 4.5 mi | |
| 2014 | Missing data/not specified/undetermined | 256 | 4.4 mi | |
| 2001 | Missing data/not specified/undetermined | 250 | 49.0 mi | |
| 2015 | Missing data/not specified/undetermined | 250 | 5.1 mi | |
| 2016 | Arson/incendiarism | 190 | 49.2 mi | |
| 2007 | Missing data/not specified/undetermined | 186 | 32.5 mi | |
| 2016 | Missing data/not specified/undetermined | 172 | 4.6 mi | |
| 2004 | Missing data/not specified/undetermined | 120 | 32.8 mi | |
| 2014 | Missing data/not specified/undetermined | 90 | 34.0 mi |
Top 2 ZIP codes by NFIRS incident count across 2021–2025. Each ZIP has its own fire profile — dive in for neighborhood-level context.
Six Massachusetts cities with population within ±25% of Bolton. Useful comparison targets — same state, similar size, different fire profile.
A 30-minute weekend can cut your home's exposure substantially. These four checklists are a good starting point.
Numbers reflect incidents reported by participating fire departments to the National Fire Incident Reporting System (NFIRS) Public Data Release for calendar year 2025. NFIRS is voluntary — about 23,000 of roughly 30,000 US fire departments report — so totals are a strong indicator, not a complete census. Per-capita comparisons use 2023 ACS population estimates. Wildland fire data complements NFIRS with NIFC and USFS perimeters. Active-fire counts come from a dated NIFC snapshot, not a live feed.