San Martin, CA— fire, flood & earthquake hazard information
San Martin is a unincorporated community in Santa Clara County in the San Francisco Bay Area, covering about 11.6 square miles. This page summarizes what official government maps show for San Martin: 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 San Martin’s area that falls inside each mapped zone.
View San Martin on the interactive map → to check any specific address, free.
Wildfire hazard severity zones
Per CAL FIRE's Fire Hazard Severity Zone maps, less than 1% is in a High zone, 9% is in a Moderate zone. The remainder of its area is outside currently designated zones.
| High severity zone | less than 1% |
| Moderate severity zone | 9% |
FEMA flood zones
21% of San Martin lies within a FEMA Special Flood Hazard Area (1% annual chance, zones A/AE/AH/AO). Federally backed mortgages in a Special Flood Hazard Area generally require flood insurance.
| Special Flood Hazard Area (100-yr) | 21% |
Earthquake faults & seismic zones
The nearest mapped fault, the Coyote Creek fault zone, is about 2.2 mi (3.5 km) from the center of San Martin.
| Nearest mapped fault | Coyote Creek fault zone — 2.2 mi (3.5 km) |
Dam inundation, aircraft noise & air quality
38% of San Martin lies within a state-reviewed dam-failure inundation area; 2% is inside an airport noise contour of 65 dB CNEL or louder; annual average fine-particle (PM2.5) concentration across its census tracts is 6.6 μg/m³, and its composite pollution burden ranks around the 57th percentile statewide.
| Dam-failure inundation area | 38% |
| Airport noise ≥65 dB CNEL | 2% |
| Annual PM2.5 (tract average) | 6.6 μg/m³ |
| Pollution burden percentile (statewide) | ~57 |
Frequently asked questions
- Is San Martin in a wildfire hazard severity zone?
- Per CAL FIRE's Fire Hazard Severity Zone maps, less than 1% is in a High zone, 9% is in a Moderate zone. The remainder of its area is outside currently designated zones.
- Is San Martin in a FEMA flood zone?
- 21% of San Martin lies within a FEMA Special Flood Hazard Area (1% annual chance, zones A/AE/AH/AO). Federally backed mortgages in a Special Flood Hazard Area generally require flood insurance.
- What earthquake faults and seismic zones affect San Martin?
- The nearest mapped fault, the Coyote Creek fault zone, is about 2.2 mi (3.5 km) from the center of San Martin.
- How do I check a specific address in San Martin?
- Use the free sitelume interactive map at https://sitelume.com — search any San Martin address to see which mapped zones it falls in, layer by layer.
Nearby in Santa Clara 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.