In 2025, fire departments serving Delafield responded to 45 fire and hazmat incidents — from cooking fires to gas leaks to a single $500K building blaze. Here's the full picture.
Incomplete 2025 data. Delafield's departments reported 45 incidents to NFIRS for 2025, against about 82 in a typical year, so 2025 figures on this page undercount. The 2021–2025 totals are the better guide.
Gas leak (natural gas or LPG) lead by count. Building fires lead by dollars. Together the top five categories make up about 53% of all calls.
Mar peaks. May dips. Watch for the typical fall climb starting in October.
411 incidents 2021–2025. Peak year was 2023. $1.8M cumulative property loss.
| Year | Incidents | YoY | |
|---|---|---|---|
| 2021 | 89 | — | |
| 2022 | 65 | -27.0% | |
| 2023 | 129 | +98.5% | |
| 2024 | 83 | -35.7% | |
| 2025* | 45 | — |
* Well below Delafield'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 2 building fires Delafield departments responded to in 2025, here's how they were classified once investigators were finished.
NFIRS Area of Origin (AREA_ORIG) for the 77 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 | 21 | 27.3% | |
| 2 | Outside area, other | 10 | 13.0% | |
| 3 | Open area - outside; included are farmland, field | 7 | 9.1% | |
| 4 | Undetermined | 6 | 7.8% | |
| 5 | Wildland, woods | 5 | 6.5% | |
| 6 | Cooking area, kitchen | 4 | 5.2% | |
| 7 | Cargo/trunk area - all vehicles | 4 | 5.2% | |
| 8 | Chute/container - trash, rubbish, waste | 3 | 3.9% | |
| 9 | Other | 2 | 2.6% | |
| 10 | Vehicle storage area; garage, carport | 2 | 2.6% | |
| 11 | All other areas | 13 | 16.9% |
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 Delafield mix.
| # | Heat source | Count | Share | |
|---|---|---|---|---|
| 1 | Undetermined | 29 | 37.7% | |
| 2 | Heat from powered equipment, other | 6 | 7.8% | |
| 3 | Spark, ember or flame from operating equipment | 5 | 6.5% | |
| 4 | Hot ember or ash | 5 | 6.5% | |
| 5 | Radiated, conducted heat from operating equipment | 4 | 5.2% | |
| 6 | Flame/torch used for lighting | 4 | 5.2% | |
| 7 | Chemical reaction | 4 | 5.2% | |
| 8 | Hot or smoldering object, other | 3 | 3.9% | |
| 9 | Match | 3 | 3.9% | |
| 10 | Arcing | 2 | 2.6% | |
| 11 | All other sources | 12 | 15.6% |
Largest single-incident property losses reported by Delafield departments in 2025. These 5 fires alone account for 100% of the city's annual total.
| # | Property loss | Type | Severity | Status |
|---|---|---|---|---|
| 1 | $500,000 | Off-road vehicle or heavy equipment fire | Major | Investigated |
| 2 | $15,000 | Building fires | Significant | Investigated |
| 3 | $15,000 | Building fires | Significant | Investigated |
| 4 | $12,000 | Passenger vehicle fire | Significant | Investigated |
| 5 | $11,000 | Passenger vehicle fire | Significant | Investigated |
Per-capita rates let us compare apples to apples. Delafield sits below the national average for incidents per resident.
Top 25 wildfires (1992+) in the FPA-FOD ignitions database, scaled by acres. 9,106 acres burned in this 50-mile radius. Each dot is a fire — bigger dots burned more land.
| Year | Cause | Acres | Distance | |
|---|---|---|---|---|
| 2003 | Arson/incendiarism | 1,100 | 25.7 mi | |
| 1994 | Arson/incendiarism | 1,015 | 37.9 mi | |
| 2014 | Debris and open burning | 829 | 47.9 mi | |
| 1998 | Equipment and vehicle use | 630 | 48.1 mi | |
| 2006 | Debris and open burning | 612 | 40.5 mi | |
| 2003 | Missing data/not specified/undetermined | 508 | 48.7 mi | |
| 2003 | Missing data/not specified/undetermined | 500 | 48.1 mi | |
| 2014 | Debris and open burning | 364 | 34.7 mi | |
| 2002 | Natural | 360 | 29.9 mi | |
| 2002 | Arson/incendiarism | 325 | 36.1 mi | |
| 2003 | Missing data/not specified/undetermined | 300 | 44.8 mi | |
| 2003 | Arson/incendiarism | 290 | 29.7 mi |
Top 8 ZIP codes by NFIRS incident count across 2021–2025. Each ZIP has its own fire profile — dive in for neighborhood-level context.
Six Wisconsin cities with population within ±25% of Delafield. Useful comparison targets — same state, similar size, different fire profile.
1 departments report to NFIRS for incidents in Delafield.
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.