City vs city
Ashland vs Castro Valley, CA
Ashland currently scores 3 points higher overall than Castro Valley, 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
Ashland: 27/100 · Castro Valley: 24/100
Ashland is 3 points higher.
Flood
Ashland: 56/100 · Castro Valley: 26/100
Ashland is 30 points higher.
Ashland: FEMA NFHL flood zones: 22 features intersect this tile.
Castro Valley: FEMA NFHL flood zones: 4 features intersect this tile.
Wind
Ashland: 2/100 · Castro Valley: 2/100
No gap.
Ashland: Wind exposure derived from ingested design wind / climatology tiles.
Castro Valley: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Ashland: 0/100 · Castro Valley: 0/100
No gap.
Ashland: Lightning exposure derived from ingested climatology tiles.
Castro Valley: Lightning exposure derived from ingested climatology tiles.
Tornado
Ashland: 0/100 · Castro Valley: 0/100
No gap.
Ashland: Tornado risk derived from NOAA SPC historical reports.
Castro Valley: Tornado risk derived from NOAA SPC historical reports.
Hail
Ashland: 2/100 · Castro Valley: 1/100
Ashland is 1 points higher.
Ashland: Hail risk derived from NOAA SPC historical reports.
Castro Valley: Hail risk derived from NOAA SPC historical reports.
Storm surge
Ashland: Unavailable · Castro Valley: Unavailable
A score difference cannot be calculated without both sources.
Ashland: Storm surge model is not available for this location yet.
Castro Valley: Storm surge model is not available for this location yet.
Wildfire
Ashland: 52/100 · Castro Valley: 67/100
Castro Valley is 15 points higher.
Ashland: Wildfire exposure derived from ingested fire potential tiles.
Castro Valley: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Ashland: 24/100 · Castro Valley: 24/100
No gap.
Ashland: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Castro 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.