ZIP 53146 recorded 83 fire and hazmat incidents in 2025, 333 across 2021–2025. Primary county: Waukesha County, WI. FEMA NRI rates wildfire risk here as Moderate.
333 incidents from 2021 through 2025 inside this ZIP.
| Year | Incidents | |
|---|---|---|
| 2021 | 61 | |
| 2022 | 64 | |
| 2023 | 43 | |
| 2024 | 82 | |
| 2025 | 83 |
Aug peaks. Mar dips. Aggregated across all 5 years inside this ZIP.
Top 5 NFIRS incident types for ZIP 53146 across 2021–2025.
| # | Incident type | Count | Share | |
|---|---|---|---|---|
| 1 | Building fires | 60 | 18.0% | |
| 2 | Power line down | 42 | 12.6% | |
| 3 | Arcing, shorted electrical equipment | 38 | 11.4% | |
| 4 | Gas leak (natural gas or LPG) | 35 | 10.5% | |
| 5 | Carbon monoxide incident | 15 | 4.5% |
For the 24 building fires reported here in 2025, here's how investigators classified ignition cause.
NFIRS Area of Origin for ZIP 53146 fires across 2021–2025.
| # | Area of origin | Count | Share | |
|---|---|---|---|---|
| 1 | Engine area, running gear, wheel area | 8 | 21.6% | |
| 2 | Cooking area, kitchen | 5 | 13.5% | |
| 3 | Other | 3 | 8.1% | |
| 4 | Undetermined | 3 | 8.1% | |
| 5 | Vehicle area, other | 2 | 5.4% | |
| 6 | Outside area, other | 2 | 5.4% | |
| 7 | Courtyard, patio, porch, terrace | 2 | 5.4% | |
| 8 | Egress/exit, other | 1 | 2.7% | |
| 9 | All other areas | 11 | 29.7% |
NFIRS HEAT_SOURC code — the physical thing that started the fire.
| # | Heat source | Count | Share | |
|---|---|---|---|---|
| 1 | Undetermined | 13 | 35.1% | |
| 2 | Heat from powered equipment, other | 10 | 27.0% | |
| 3 | Radiated, conducted heat from operating equipment | 4 | 10.8% | |
| 4 | Heat source: other | 2 | 5.4% | |
| 5 | Spark, ember or flame from operating equipment | 1 | 2.7% | |
| 6 | Arcing | 1 | 2.7% | |
| 7 | Hot or smoldering object, other | 1 | 2.7% | |
| 8 | Hot ember or ash | 1 | 2.7% | |
| 9 | All other sources | 4 | 10.8% |
Largest single-incident losses in ZIP 53146 across 2021–2025. These 8 fires alone account for 146% of the ZIP's 2025 reported total.
| # | Property loss | Type | Year | Severity |
|---|---|---|---|---|
| 1 | $800,000 | Building fires | 2025 | Major |
| 2 | $300,000 | Building fires | 2023 | Major |
| 3 | $100,000 | Building fires | 2021 | Significant |
| 4 | $100,000 | Building fires | 2025 | Significant |
| 5 | $60,000 | Building fires | 2025 | Significant |
| 6 | $50,000 | Building fires | 2024 | Significant |
| 7 | $10,000 | Building fires | 2021 | Significant |
| 8 | $7,600 | Off-road vehicle or heavy equipment fire | 2022 | Significant |
Some ZIPs span multiple cities. Ranked by 5-yr NFIRS incidents inside ZIP 53146.
| # | City | 5-yr incidents | |
|---|---|---|---|
| 1 | New Berlin | 328 | |
| 2 | Brookfield | 2 | |
| 3 | Muskego | 2 | |
| 4 | Waukesha | 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 — 333 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.