Suisun City, CA— fire, flood & earthquake hazard information
Suisun City is a city in Solano County in the San Francisco Bay Area, covering about 4.0 square miles. This page summarizes what official government maps show for Suisun City: 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 Suisun City’s area that falls inside each mapped zone.
View Suisun City 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 Suisun City. Individual properties near the boundary can still fall inside a neighboring zone — check the exact address on the map.
FEMA flood zones
19% of Suisun City 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) | 19% |
| 0.2% annual chance (500-yr) | 2% |
Earthquake faults & seismic zones
The nearest mapped fault, the Rio Vista fault, is about 1.7 mi (2.8 km) from the center of Suisun City.
| Nearest mapped fault | Rio Vista fault — 1.7 mi (2.8 km) |
Dam inundation, aircraft noise & air quality
9% of Suisun City lies within a state-reviewed dam-failure inundation area; annual average fine-particle (PM2.5) concentration across its census tracts is 8.3 μg/m³, and its composite pollution burden ranks around the 34th percentile statewide.
| Dam-failure inundation area | 9% |
| Annual PM2.5 (tract average) | 8.3 μg/m³ |
| Pollution burden percentile (statewide) | ~34 |
Frequently asked questions
- Is Suisun City in a wildfire hazard severity zone?
- CAL FIRE's current Fire Hazard Severity Zone maps do not designate any zones within Suisun City. Individual properties near the boundary can still fall inside a neighboring zone — check the exact address on the map.
- Is Suisun City in a FEMA flood zone?
- 19% of Suisun City 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 Suisun City?
- The nearest mapped fault, the Rio Vista fault, is about 1.7 mi (2.8 km) from the center of Suisun City.
- How do I check a specific address in Suisun City?
- Use the free sitelume interactive map at https://sitelume.com — search any Suisun City address to see which mapped zones it falls in, layer by layer.
Nearby in Solano 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.