City vs city
Los Altos vs San Francisco, CA
Los Altos currently scores 4 points higher overall than San Francisco, with the largest gap in flood.
Use this comparison for relocation decisions, insurance shopping, and hazard-prioritized mitigation planning.
Hazard breakdown
Scores describe each city’s reference grid tile, not every property. A missing model is unavailable, not zero risk. Air quality uses an ingested EPA AirNow snapshot and may not reflect current conditions; other factors describe baseline exposure. The overall score blends different hazards and is not a probability of damage. Read the scoring methodology and sources.
Overall
Los Altos: 29/100 · San Francisco: 25/100
Los Altos is 4 points higher.
Flood
Los Altos: 52/100 · San Francisco: 26/100
Los Altos is 26 points higher.
Los Altos: FEMA NFHL flood zones: 16 features intersect this tile.
San Francisco: FEMA NFHL flood zones: 4 features intersect this tile.
Wind
Los Altos: 2/100 · San Francisco: 2/100
No gap.
Los Altos: Wind exposure derived from ingested design wind / climatology tiles.
San Francisco: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Los Altos: 0/100 · San Francisco: 0/100
No gap.
Los Altos: Lightning exposure derived from ingested climatology tiles.
San Francisco: Lightning exposure derived from ingested climatology tiles.
Tornado
Los Altos: 19/100 · San Francisco: 0/100
Los Altos is 19 points higher.
Los Altos: Tornado risk derived from NOAA SPC historical reports.
San Francisco: Tornado risk derived from NOAA SPC historical reports.
Hail
Los Altos: 11/100 · San Francisco: 18/100
San Francisco is 7 points higher.
Los Altos: Hail risk derived from NOAA SPC historical reports.
San Francisco: Hail risk derived from NOAA SPC historical reports.
Storm surge
Los Altos: Unavailable · San Francisco: Unavailable
A score difference cannot be calculated without both sources.
Los Altos: Storm surge model is not available for this location yet.
San Francisco: Storm surge model is not available for this location yet.
Wildfire
Los Altos: 63/100 · San Francisco: 52/100
Los Altos is 11 points higher.
Los Altos: Wildfire exposure derived from ingested fire potential tiles.
San Francisco: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Los Altos: 26/100 · San Francisco: 25/100
Los Altos is 1 points higher.
Los Altos: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
San Francisco: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.