City vs city
Grass Valley vs San Francisco, CA
Grass Valley currently scores 11 points higher overall than San Francisco, with the largest gap in ingested air quality.
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
Grass Valley: 36/100 · San Francisco: 25/100
Grass Valley is 11 points higher.
Flood
Grass Valley: 26/100 · San Francisco: 26/100
No gap.
Grass Valley: FEMA NFHL flood zones: 2 features intersect this tile.
San Francisco: FEMA NFHL flood zones: 4 features intersect this tile.
Wind
Grass Valley: 4/100 · San Francisco: 2/100
Grass Valley is 2 points higher.
Grass Valley: Wind exposure derived from ingested design wind / climatology tiles.
San Francisco: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Grass Valley: 1/100 · San Francisco: 0/100
Grass Valley is 1 points higher.
Grass Valley: Lightning exposure derived from ingested climatology tiles.
San Francisco: Lightning exposure derived from ingested climatology tiles.
Tornado
Grass Valley: 0/100 · San Francisco: 0/100
No gap.
Grass Valley: Tornado risk derived from NOAA SPC historical reports.
San Francisco: Tornado risk derived from NOAA SPC historical reports.
Hail
Grass Valley: 3/100 · San Francisco: 18/100
San Francisco is 15 points higher.
Grass Valley: Hail risk derived from NOAA SPC historical reports.
San Francisco: Hail risk derived from NOAA SPC historical reports.
Storm surge
Grass Valley: Unavailable · San Francisco: Unavailable
A score difference cannot be calculated without both sources.
Grass Valley: Storm surge model is not available for this location yet.
San Francisco: Storm surge model is not available for this location yet.
Wildfire
Grass Valley: 84/100 · San Francisco: 52/100
Grass Valley is 32 points higher.
Grass Valley: Wildfire exposure derived from ingested fire potential tiles.
San Francisco: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Grass Valley: 100/100 · San Francisco: 25/100
Grass Valley is 75 points higher.
Grass Valley: 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.