Brentwood, CA— fire, flood & earthquake hazard information
Brentwood is a city in Contra Costa County in the San Francisco Bay Area, covering about 14.9 square miles. This page summarizes what official government maps show for Brentwood: 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 Brentwood’s area that falls inside each mapped zone.
View Brentwood 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 Brentwood. Individual properties near the boundary can still fall inside a neighboring zone — check the exact address on the map.
FEMA flood zones
2% of Brentwood lies within a FEMA Special Flood Hazard Area (1% annual chance, zones A/AE/AH/AO); 2% 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) | 2% |
Earthquake faults & seismic zones
The nearest mapped fault, the Davis fault, is about 2.5 mi (4.0 km) from the center of Brentwood. 1 named fault trace in the USGS Quaternary fault database cross its boundary. 53% of its area is in a state-designated liquefaction zone of required investigation. less than 1% is in an earthquake-induced landslide zone.
| Nearest mapped fault | Davis fault — 2.5 mi (4.0 km) |
| Named fault traces crossing boundary | 1 |
| Liquefaction zone | 53% |
| Earthquake-induced landslide zone | less than 1% |
Dam inundation, aircraft noise & air quality
25% of Brentwood lies within a state-reviewed dam-failure inundation area; annual average fine-particle (PM2.5) concentration across its census tracts is 8.6 μg/m³, and its composite pollution burden ranks around the 54th percentile statewide.
| Dam-failure inundation area | 25% |
| Annual PM2.5 (tract average) | 8.6 μg/m³ |
| Pollution burden percentile (statewide) | ~54 |
Frequently asked questions
- Is Brentwood in a wildfire hazard severity zone?
- CAL FIRE's current Fire Hazard Severity Zone maps do not designate any zones within Brentwood. Individual properties near the boundary can still fall inside a neighboring zone — check the exact address on the map.
- Is Brentwood in a FEMA flood zone?
- 2% of Brentwood lies within a FEMA Special Flood Hazard Area (1% annual chance, zones A/AE/AH/AO); 2% 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 Brentwood?
- The nearest mapped fault, the Davis fault, is about 2.5 mi (4.0 km) from the center of Brentwood. 1 named fault trace in the USGS Quaternary fault database cross its boundary. 53% of its area is in a state-designated liquefaction zone of required investigation. less than 1% is in an earthquake-induced landslide zone.
- How do I check a specific address in Brentwood?
- Use the free sitelume interactive map at https://sitelume.com — search any Brentwood address to see which mapped zones it falls in, layer by layer.
Nearby in Contra Costa 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.