Sea Ranch, CA— fire, flood & earthquake hazard information
Sea Ranch is a unincorporated community in Sonoma County in the San Francisco Bay Area, covering about 16.1 square miles. This page summarizes what official government maps show for Sea Ranch: 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 Sea Ranch’s area that falls inside each mapped zone.
View Sea Ranch on the interactive map → to check any specific address, free.
Wildfire hazard severity zones
Per CAL FIRE's Fire Hazard Severity Zone maps, 68% is in a High zone. The remainder of its area is outside currently designated zones.
| High severity zone | 68% |
FEMA flood zones
FEMA's National Flood Hazard Layer does not map any Special Flood Hazard Areas within Sea Ranch. Unmapped does not mean flooding cannot occur — it means no zone is currently designated.
Earthquake faults & seismic zones
The nearest mapped fault, the Unnamed fault in California, is about 23.9 mi (38.5 km) from the center of Sea Ranch.
| Nearest mapped fault | Unnamed fault in California — 23.9 mi (38.5 km) |
Dam inundation, aircraft noise & air quality
annual average fine-particle (PM2.5) concentration across its census tracts is 5.8 μg/m³, and its composite pollution burden ranks around the 6th percentile statewide.
| Annual PM2.5 (tract average) | 5.8 μg/m³ |
| Pollution burden percentile (statewide) | ~6 |
Frequently asked questions
- Is Sea Ranch in a wildfire hazard severity zone?
- Per CAL FIRE's Fire Hazard Severity Zone maps, 68% is in a High zone. The remainder of its area is outside currently designated zones.
- Is Sea Ranch in a FEMA flood zone?
- FEMA's National Flood Hazard Layer does not map any Special Flood Hazard Areas within Sea Ranch. Unmapped does not mean flooding cannot occur — it means no zone is currently designated.
- What earthquake faults and seismic zones affect Sea Ranch?
- The nearest mapped fault, the Unnamed fault in California, is about 23.9 mi (38.5 km) from the center of Sea Ranch.
- How do I check a specific address in Sea Ranch?
- Use the free sitelume interactive map at https://sitelume.com — search any Sea Ranch 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.