Sonoma, CA— fire, flood & earthquake hazard information
Sonoma is a city in Sonoma County in the San Francisco Bay Area, covering about 2.7 square miles. This page summarizes what official government maps show for Sonoma: CAL FIRE fire hazard severity zones, FEMA flood zones, state seismic hazard zones, dam inundation areas, airport noise contours, and air-quality indicators. Figures are the share of Sonoma’s area that falls inside each mapped zone.
View Sonoma on the interactive map → to check any specific address, free.
Wildfire hazard severity zones
Per CAL FIRE's Fire Hazard Severity Zone maps, less than 1% is in a High zone. The remainder of its area is outside currently designated zones.
| High severity zone | less than 1% |
FEMA flood zones
3% of Sonoma lies within a FEMA Special Flood Hazard Area (1% annual chance, zones A/AE/AH/AO); 16% is in the 0.2% annual chance (500-year) area. Federally backed mortgages in a Special Flood Hazard Area generally require flood insurance.
| Special Flood Hazard Area (100-yr) | 3% |
| 0.2% annual chance (500-yr) | 16% |
Earthquake faults & seismic zones
The nearest mapped fault, the unnamed fault west of Carneros Creek, is about 2.5 mi (4.0 km) from the center of Sonoma.
| Nearest mapped fault | unnamed fault west of Carneros Creek — 2.5 mi (4.0 km) |
Dam inundation, aircraft noise & air quality
annual average fine-particle (PM2.5) concentration across its census tracts is 8.1 μg/m³, and its composite pollution burden ranks around the 15th percentile statewide.
| Annual PM2.5 (tract average) | 8.1 μg/m³ |
| Pollution burden percentile (statewide) | ~15 |
Frequently asked questions
- Is Sonoma in a wildfire hazard severity zone?
- Per CAL FIRE's Fire Hazard Severity Zone maps, less than 1% is in a High zone. The remainder of its area is outside currently designated zones.
- Is Sonoma in a FEMA flood zone?
- 3% of Sonoma lies within a FEMA Special Flood Hazard Area (1% annual chance, zones A/AE/AH/AO); 16% is in the 0.2% annual chance (500-year) area. Federally backed mortgages in a Special Flood Hazard Area generally require flood insurance.
- What earthquake faults and seismic zones affect Sonoma?
- The nearest mapped fault, the unnamed fault west of Carneros Creek, is about 2.5 mi (4.0 km) from the center of Sonoma.
- How do I check a specific address in Sonoma?
- Use the free sitelume interactive map at https://sitelume.com — search any Sonoma address to see which mapped zones it falls in, layer by layer.
Nearby in Sonoma County
Sources: CAL FIRE Fire Hazard Severity Zones; FEMA National Flood Hazard Layer; USGS Quaternary Faults; CGS Seismic Hazard Zones & Alquist-Priolo zones; Cal OES dam inundation maps; county ALUC noise contours; CalEnviroScreen 4.0. Area shares are computed against each place’s Census TIGER boundary (last computed 2026-07-24). Boundaries and zone designations change; always verify with the issuing agency.