Glen Ellen, CA— fire, flood & earthquake hazard information
Glen Ellen is a unincorporated community in Sonoma County in the San Francisco Bay Area, covering about 2.1 square miles. This page summarizes what official government maps show for Glen Ellen: 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 Glen Ellen’s area that falls inside each mapped zone.
View Glen Ellen on the interactive map → to check any specific address, free.
Wildfire hazard severity zones
Per CAL FIRE's Fire Hazard Severity Zone maps, 48% is in a High zone, 52% is in a Moderate zone. The remainder of its area is outside currently designated zones.
| High severity zone | 48% |
| Moderate severity zone | 52% |
FEMA flood zones
2% of Glen Ellen lies within a FEMA Special Flood Hazard Area (1% annual chance, zones A/AE/AH/AO); less than 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) | 2% |
| 0.2% annual chance (500-yr) | less than 1% |
Earthquake faults & seismic zones
The nearest mapped fault, the Unnamed fault in California, is about 0.3 mi (0.4 km) from the center of Glen Ellen. 2 named fault traces in the USGS Quaternary fault database cross its boundary.
| Nearest mapped fault | Unnamed fault in California — 0.3 mi (0.4 km) |
| Named fault traces crossing boundary | 2 |
Dam inundation, aircraft noise & air quality
less than 1% of Glen Ellen lies within a state-reviewed dam-failure inundation area; annual average fine-particle (PM2.5) concentration across its census tracts is 7.4 μg/m³, and its composite pollution burden ranks around the 21th percentile statewide.
| Dam-failure inundation area | less than 1% |
| Annual PM2.5 (tract average) | 7.4 μg/m³ |
| Pollution burden percentile (statewide) | ~21 |
Frequently asked questions
- Is Glen Ellen in a wildfire hazard severity zone?
- Per CAL FIRE's Fire Hazard Severity Zone maps, 48% is in a High zone, 52% is in a Moderate zone. The remainder of its area is outside currently designated zones.
- Is Glen Ellen in a FEMA flood zone?
- 2% of Glen Ellen lies within a FEMA Special Flood Hazard Area (1% annual chance, zones A/AE/AH/AO); less than 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 Glen Ellen?
- The nearest mapped fault, the Unnamed fault in California, is about 0.3 mi (0.4 km) from the center of Glen Ellen. 2 named fault traces in the USGS Quaternary fault database cross its boundary.
- How do I check a specific address in Glen Ellen?
- Use the free sitelume interactive map at https://sitelume.com — search any Glen Ellen 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.