Boyes Hot Springs, CA— fire, flood & earthquake hazard information
Boyes Hot Springs is a unincorporated community in Sonoma County in the San Francisco Bay Area, covering about 1.1 square miles. This page summarizes what official government maps show for Boyes Hot Springs: 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 Boyes Hot Springs’s area that falls inside each mapped zone.
View Boyes Hot Springs on the interactive map → to check any specific address, free.
Wildfire hazard severity zones
CAL FIRE's current Fire Hazard Severity Zone maps do not designate any zones within Boyes Hot Springs. Individual properties near the boundary can still fall inside a neighboring zone — check the exact address on the map.
FEMA flood zones
5% of Boyes Hot Springs lies within a FEMA Special Flood Hazard Area (1% annual chance, zones A/AE/AH/AO); 1% 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) | 5% |
| 0.2% annual chance (500-yr) | 1% |
Earthquake faults & seismic zones
The nearest mapped fault, the Unnamed fault in California, is about 1.2 mi (1.9 km) from the center of Boyes Hot Springs.
| Nearest mapped fault | Unnamed fault in California — 1.2 mi (1.9 km) |
Dam inundation, aircraft noise & air quality
3% of Boyes Hot Springs lies within a state-reviewed dam-failure inundation area; annual average fine-particle (PM2.5) concentration across its census tracts is 7.9 μg/m³, and its composite pollution burden ranks around the 12th percentile statewide.
| Dam-failure inundation area | 3% |
| Annual PM2.5 (tract average) | 7.9 μg/m³ |
| Pollution burden percentile (statewide) | ~12 |
Frequently asked questions
- Is Boyes Hot Springs in a wildfire hazard severity zone?
- CAL FIRE's current Fire Hazard Severity Zone maps do not designate any zones within Boyes Hot Springs. Individual properties near the boundary can still fall inside a neighboring zone — check the exact address on the map.
- Is Boyes Hot Springs in a FEMA flood zone?
- 5% of Boyes Hot Springs lies within a FEMA Special Flood Hazard Area (1% annual chance, zones A/AE/AH/AO); 1% 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 Boyes Hot Springs?
- The nearest mapped fault, the Unnamed fault in California, is about 1.2 mi (1.9 km) from the center of Boyes Hot Springs.
- How do I check a specific address in Boyes Hot Springs?
- Use the free sitelume interactive map at https://sitelume.com — search any Boyes Hot Springs 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.