City vs city
Alto vs San Francisco, CA
Alto 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
Alto: 29/100 · San Francisco: 25/100
Alto is 4 points higher.
Flood
Alto: 41/100 · San Francisco: 26/100
Alto is 15 points higher.
Alto: FEMA NFHL flood zones: 11 features intersect this tile.
San Francisco: FEMA NFHL flood zones: 4 features intersect this tile.
Wind
Alto: 2/100 · San Francisco: 2/100
No gap.
Alto: Wind exposure derived from ingested design wind / climatology tiles.
San Francisco: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Alto: 0/100 · San Francisco: 0/100
No gap.
Alto: Lightning exposure derived from ingested climatology tiles.
San Francisco: Lightning exposure derived from ingested climatology tiles.
Tornado
Alto: 0/100 · San Francisco: 0/100
No gap.
Alto: Tornado risk derived from NOAA SPC historical reports.
San Francisco: Tornado risk derived from NOAA SPC historical reports.
Hail
Alto: 18/100 · San Francisco: 18/100
No gap.
Alto: Hail risk derived from NOAA SPC historical reports.
San Francisco: Hail risk derived from NOAA SPC historical reports.
Storm surge
Alto: Unavailable · San Francisco: Unavailable
A score difference cannot be calculated without both sources.
Alto: Storm surge model is not available for this location yet.
San Francisco: Storm surge model is not available for this location yet.
Wildfire
Alto: 57/100 · San Francisco: 52/100
Alto is 5 points higher.
Alto: Wildfire exposure derived from ingested fire potential tiles.
San Francisco: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Alto: 26/100 · San Francisco: 25/100
Alto is 1 points higher.
Alto: 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.