How much is flood insurance in San Francisco?

Flood insurance in San Francisco ranges from $400/year in Zone X to $20,000+/year in VE coastal zones along Ocean Beach. AE zones in SOMA and Mission Creek average $1,500–$5,000/year. Risk Rating 2.0 increased premiums for many bayfront properties.

What is combined sewer overflow flooding in SF?

San Francisco has a combined sewer system that carries both sewage and stormwater. During heavy rain, the system can be overwhelmed, causing backup into basements and street flooding in low-lying areas like the Mission, SOMA, and Sunset. SFPUC is investing in green infrastructure to reduce overflow frequency.

How does sea level rise affect San Francisco?

Sea level rise projections show 1-3.5 feet of rise by 2100, which would expand flood zones in Mission Bay, SOMA, Treasure Island, and waterfront areas. King tides already cause periodic flooding along the Embarcadero. The city requires new waterfront development to plan for future sea level rise.

Can I build in a San Francisco flood zone?

Yes, with significant requirements. AE zones require elevation to BFE plus freeboard. VE zones require pile or column foundations. All new construction in combined sewer areas must include backflow prevention. Waterfront projects must incorporate sea level rise adaptation measures.

Is Mission Bay at flood risk?

Mission Bay is built on filled tidal marshland at low elevation, placing portions in FEMA AE and AO zones. The neighborhood faces risk from bay storm surge, king tides, and sea level rise. New development in Mission Bay incorporates elevated ground floors and flood-resistant design as required by the area plan.

San Francisco, California · FEMA Region 9

Is San Francisco in a Flood Zone?

Q: Is San Francisco in a flood zone?

Parts of San Francisco are in FEMA flood zones, particularly along Mission Creek, the Embarcadero, Islais Creek, and Ocean Beach. The SOMA and Mission Bay neighborhoods are in AE and AO zones. Much of the city is in Zone X (minimal risk), but combined sewer overflow creates localized flood risk not captured on FEMA maps. Enter your address at ReadyPermit for property-specific data.

Moderate Flood Risk

San Francisco has moderate flood risk concentrated along the Mission Creek corridor, the Embarcadero waterfront, and areas with combined sewer overflow issues. Coastal flooding from king tides and sea level rise threatens the SOMA, Mission Bay, and Islais Creek areas. The city's combined sewer system can back up during heavy rainfall, causing localized urban flooding.

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FEMA Flood Zones in San Francisco

100-Year Floodplain (Detailed)

Found along Mission Creek, Islais Creek, and portions of the Embarcadero waterfront. BFE established. Flood insurance required for federally backed mortgages.

Shallow Flooding

Sheet flow areas in low-lying SOMA and South Beach neighborhoods. 1-3 feet of ponding during heavy rain events.

Coastal High Hazard

Wave action zones along Ocean Beach and exposed waterfront areas. Strictest construction requirements.

X (shaded)

500-Year Floodplain

Moderate risk. Found in parts of the Mission District and along historical creek alignments. Insurance not required but recommended.

Flood Insurance Costs in San Francisco

Zone AE (Mission Creek/SOMA): $1,500–$5,000/year
Zone VE (Ocean Beach): $6,000–$20,000/year
Zone AO: $1,000–$3,000/year
Zone X (shaded): $400–$900/year if purchased voluntarily
Risk Rating 2.0 has increased premiums for bayfront properties
Private flood insurance available for elevated structures

Building Requirements in Flood Zones

AE zones: lowest floor at or above BFE; SF adds additional freeboard for sea level rise
VE zones: elevated on pilings/columns, breakaway walls below BFE
Combined sewer areas: backflow prevention devices required for new construction
Mission Bay and Hunters Point: site-specific flood mitigation per area plans
Sea level rise adaptation: new waterfront development must plan for 3.5 ft rise by 2100
Substantial improvement threshold (>50% of value) triggers full flood compliance

How to Check Flood Risk in San Francisco

1
Check your flood zone
Enter your San Francisco address into ReadyPermit or FEMA's Flood Map Service Center. SF Public Works also provides flood information through their stormwater management program.
2
Assess combined sewer risk
San Francisco uses a combined sewer system. Properties in low-lying areas may experience sewer backup during heavy rain. Check SFPUC's flood risk maps for combined sewer overflow areas.
3
Get an Elevation Certificate
Required for flood insurance rating in A and V zones. Hire a California-licensed surveyor ($500–$900 in San Francisco).
4
Obtain flood insurance
Required for A/AE/V/VE zones with federally backed mortgages. SOMA and Mission Bay properties should consider coverage even in Zone X due to sea level rise trends.
5
Review building requirements
Check SF Department of Building Inspection requirements for flood compliance, sea level rise adaptation, and combined sewer backflow prevention.
6
Plan for sea level rise
San Francisco is projected to see 1-3.5 feet of sea level rise by 2100. Factor this into waterfront property decisions, especially in Mission Bay, SOMA, and Treasure Island.
7
Monitor king tide events
King tides preview future sea level rise impacts. Monitor SF Bay Conservation and Development Commission king tide tracking for your area.

Frequently Asked Questions — San Francisco Flood Zones

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