City vs city
San Mateo vs South San Francisco, CA
San Mateo currently scores 5 points higher overall than South 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
San Mateo: 26/100 · South San Francisco: 21/100
San Mateo is 5 points higher.
Flood
San Mateo: 40/100 · South San Francisco: 31/100
San Mateo is 9 points higher.
San Mateo: FEMA NFHL flood zones: 13 features intersect this tile.
South San Francisco: FEMA NFHL flood zones: 9 features intersect this tile.
Wind
San Mateo: 2/100 · South San Francisco: 2/100
No gap.
San Mateo: Wind exposure derived from ingested design wind / climatology tiles.
South San Francisco: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
San Mateo: 0/100 · South San Francisco: 0/100
No gap.
San Mateo: Lightning exposure derived from ingested climatology tiles.
South San Francisco: Lightning exposure derived from ingested climatology tiles.
Tornado
San Mateo: 0/100 · South San Francisco: 8/100
South San Francisco is 8 points higher.
San Mateo: Tornado risk derived from NOAA SPC historical reports.
South San Francisco: Tornado risk derived from NOAA SPC historical reports.
Hail
San Mateo: 6/100 · South San Francisco: 5/100
San Mateo is 1 points higher.
San Mateo: Hail risk derived from NOAA SPC historical reports.
South San Francisco: Hail risk derived from NOAA SPC historical reports.
Storm surge
San Mateo: Unavailable · South San Francisco: Unavailable
A score difference cannot be calculated without both sources.
San Mateo: Storm surge model is not available for this location yet.
South San Francisco: Storm surge model is not available for this location yet.
Wildfire
San Mateo: 59/100 · South San Francisco: 54/100
San Mateo is 5 points higher.
San Mateo: Wildfire exposure derived from ingested fire potential tiles.
South San Francisco: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
San Mateo: 23/100 · South San Francisco: 25/100
South San Francisco is 2 points higher.
San Mateo: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
South 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.