Hercules, CA— fire, flood & earthquake hazard information
Hercules is a city in Contra Costa County in the San Francisco Bay Area, covering about 6.4 square miles. This page summarizes what official government maps show for Hercules: 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 Hercules’s area that falls inside each mapped zone.
View Hercules 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 Hercules. Individual properties near the boundary can still fall inside a neighboring zone — check the exact address on the map.
FEMA flood zones
2% of Hercules lies within a FEMA Special Flood Hazard Area (1% annual chance, zones A/AE/AH/AO); 2% is in a coastal high hazard zone (V/VE); 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% |
| Coastal high hazard (V/VE) | 2% |
| 0.2% annual chance (500-yr) | less than 1% |
Earthquake faults & seismic zones
The nearest mapped fault, the Pinole fault, is about 0.8 mi (1.4 km) from the center of Hercules. 1 named fault trace in the USGS Quaternary fault database cross its boundary. 6% of its area is in a state-designated liquefaction zone of required investigation. 7% is in an earthquake-induced landslide zone.
| Nearest mapped fault | Pinole fault — 0.8 mi (1.4 km) |
| Named fault traces crossing boundary | 1 |
| Liquefaction zone | 6% |
| Earthquake-induced landslide zone | 7% |
Dam inundation, aircraft noise & air quality
annual average fine-particle (PM2.5) concentration across its census tracts is 8.8 μg/m³, and its composite pollution burden ranks around the 19th percentile statewide.
| Annual PM2.5 (tract average) | 8.8 μg/m³ |
| Pollution burden percentile (statewide) | ~19 |
Frequently asked questions
- Is Hercules in a wildfire hazard severity zone?
- CAL FIRE's current Fire Hazard Severity Zone maps do not designate any zones within Hercules. Individual properties near the boundary can still fall inside a neighboring zone — check the exact address on the map.
- Is Hercules in a FEMA flood zone?
- 2% of Hercules lies within a FEMA Special Flood Hazard Area (1% annual chance, zones A/AE/AH/AO); 2% is in a coastal high hazard zone (V/VE); 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 Hercules?
- The nearest mapped fault, the Pinole fault, is about 0.8 mi (1.4 km) from the center of Hercules. 1 named fault trace in the USGS Quaternary fault database cross its boundary. 6% of its area is in a state-designated liquefaction zone of required investigation. 7% is in an earthquake-induced landslide zone.
- How do I check a specific address in Hercules?
- Use the free sitelume interactive map at https://sitelume.com — search any Hercules 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.