How do I check a specific address in Larkspur?

Use the free sitelume interactive map at https://sitelume.com — search any Larkspur address to see which mapped zones it falls in, layer by layer.

Larkspur, CA— fire, flood & earthquake hazard information

Larkspur is a city in Marin County in the San Francisco Bay Area, covering about 3.0 square miles. This page summarizes what official government maps show for Larkspur: 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 Larkspur’s area that falls inside each mapped zone.

View Larkspur on the interactive map → to check any specific address, free.

Wildfire hazard severity zones

Per CAL FIRE's Fire Hazard Severity Zone maps, 13% of Larkspur is in a Very High fire hazard severity zone, less than 1% is in a High zone. The remainder of its area is outside currently designated zones.

Very High severity zone	13%
High severity zone	less than 1%

FEMA flood zones

21% of Larkspur lies within a FEMA Special Flood Hazard Area (1% annual chance, zones A/AE/AH/AO); 26% 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)	21%
0.2% annual chance (500-yr)	26%

Earthquake faults & seismic zones

The nearest mapped fault, the San Andreas fault zone, is about 8.2 mi (13.2 km) from the center of Larkspur.

Nearest mapped fault

San Andreas fault zone — 8.2 mi (13.2 km)

Dam inundation, aircraft noise & air quality

8% of Larkspur lies within a state-reviewed dam-failure inundation area; annual average fine-particle (PM2.5) concentration across its census tracts is 8.5 μg/m³, and its composite pollution burden ranks around the 37th percentile statewide.

Dam-failure inundation area	8%
Annual PM2.5 (tract average)	8.5 μg/m³
Pollution burden percentile (statewide)	~37

Frequently asked questions

Is Larkspur in a wildfire hazard severity zone?: Per CAL FIRE's Fire Hazard Severity Zone maps, 13% of Larkspur is in a Very High fire hazard severity zone, less than 1% is in a High zone. The remainder of its area is outside currently designated zones.
Is Larkspur in a FEMA flood zone?: 21% of Larkspur lies within a FEMA Special Flood Hazard Area (1% annual chance, zones A/AE/AH/AO); 26% 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 Larkspur?: The nearest mapped fault, the San Andreas fault zone, is about 8.2 mi (13.2 km) from the center of Larkspur.
How do I check a specific address in Larkspur?: Use the free sitelume interactive map at https://sitelume.com — search any Larkspur address to see which mapped zones it falls in, layer by layer.

Nearby in Marin 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.