ZIP 20170 recorded 91 fire and hazmat incidents in 2025, 608 across 2021–2025. Primary county: Fairfax County, VA.
608 incidents from 2021 through 2025 inside this ZIP.
| Year | Incidents | |
|---|---|---|
| 2021 | 135 | |
| 2022 | 86 | |
| 2023 | 153 | |
| 2024 | 143 | |
| 2025 | 91 |
Mar peaks. Sep dips. Aggregated across all 5 years inside this ZIP.
Top 5 NFIRS incident types for ZIP 20170 across 2021–2025.
| # | Incident type | Count | Share | |
|---|---|---|---|---|
| 1 | Gas leak (natural gas or LPG) | 168 | 27.6% | |
| 2 | Special outside fire, other | 68 | 11.2% | |
| 3 | Building fires | 65 | 10.7% | |
| 4 | Passenger vehicle fire | 24 | 3.9% | |
| 5 | Carbon monoxide incident | 24 | 3.9% |
For the 10 building fires reported here in 2025, here's how investigators classified ignition cause.
NFIRS Area of Origin for ZIP 20170 fires across 2021–2025.
| # | Area of origin | Count | Share | |
|---|---|---|---|---|
| 1 | Undetermined | 51 | 28.8% | |
| 2 | Outside area, other | 38 | 21.5% | |
| 3 | Highway, parking lot, street: on or near | 16 | 9.0% | |
| 4 | Engine area, running gear, wheel area | 13 | 7.3% | |
| 5 | Cooking area, kitchen | 10 | 5.6% | |
| 6 | Vehicle area, other | 6 | 3.4% | |
| 7 | Vehicle storage area; garage, carport | 5 | 2.8% | |
| 8 | Open area - outside; included are farmland, field | 4 | 2.3% | |
| 9 | All other areas | 34 | 19.2% |
NFIRS HEAT_SOURC code — the physical thing that started the fire.
| # | Heat source | Count | Share | |
|---|---|---|---|---|
| 1 | Undetermined | 66 | 37.3% | |
| 2 | Cigarette | 17 | 9.6% | |
| 3 | Hot ember or ash | 13 | 7.3% | |
| 4 | Hot or smoldering object, other | 12 | 6.8% | |
| 5 | Heat source: other | 11 | 6.2% | |
| 6 | Heat from powered equipment, other | 10 | 5.6% | |
| 7 | Radiated, conducted heat from operating equipment | 8 | 4.5% | |
| 8 | Heat from other open flame or smoking materials | 8 | 4.5% | |
| 9 | All other sources | 32 | 18.1% |
Largest single-incident losses in ZIP 20170 across 2021–2025. These 8 fires alone account for 1018% of the ZIP's 2025 reported total.
| # | Property loss | Type | Year | Severity |
|---|---|---|---|---|
| 1 | $540,000 | Building fires | 2021 | Major |
| 2 | $321,290 | Building fires | 2023 | Major |
| 3 | $238,000 | Building fires | 2022 | Significant |
| 4 | $202,550 | Building fires | 2021 | Significant |
| 5 | $150,000 | Building fires | 2025 | Significant |
| 6 | $90,200 | Building fires | 2024 | Significant |
| 7 | $90,000 | Building fires | 2022 | Significant |
| 8 | $70,000 | Building fires | 2022 | Significant |
Some ZIPs span multiple cities. Ranked by 5-yr NFIRS incidents inside ZIP 20170.
| # | City | 5-yr incidents | |
|---|---|---|---|
| 1 | Herndon | 592 | |
| 2 | Silver Spring | 2 | |
| 3 | Reston | 1 |
Some ZIPs span multiple counties. The primary above is the largest by population weight; secondary counties are below.
| County | State | Weight | |
|---|---|---|---|
| Loudoun County | VA | 0.50 | FIPS 51107 |
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 — 608 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.