City vs city
Atherton vs Riverside, CA
Riverside currently scores 9 points higher overall than Atherton, with the largest gap in wildfire.
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
Atherton: 23/100 · Riverside: 32/100
Riverside is 9 points higher.
Flood
Atherton: 34/100 · Riverside: 43/100
Riverside is 9 points higher.
Atherton: FEMA NFHL flood zones: 10 features intersect this tile.
Riverside: FEMA NFHL flood zones: 23 features intersect this tile.
Wind
Atherton: 2/100 · Riverside: 5/100
Riverside is 3 points higher.
Atherton: Wind exposure derived from ingested design wind / climatology tiles.
Riverside: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Atherton: 0/100 · Riverside: 2/100
Riverside is 2 points higher.
Atherton: Lightning exposure derived from ingested climatology tiles.
Riverside: Lightning exposure derived from ingested climatology tiles.
Tornado
Atherton: 0/100 · Riverside: 0/100
No gap.
Atherton: Tornado risk derived from NOAA SPC historical reports.
Riverside: Tornado risk derived from NOAA SPC historical reports.
Hail
Atherton: 3/100 · Riverside: 0/100
Atherton is 3 points higher.
Atherton: Hail risk derived from NOAA SPC historical reports.
Riverside: Hail risk derived from NOAA SPC historical reports.
Storm surge
Atherton: Unavailable · Riverside: Unavailable
A score difference cannot be calculated without both sources.
Atherton: Storm surge model is not available for this location yet.
Riverside: Storm surge model is not available for this location yet.
Wildfire
Atherton: 56/100 · Riverside: 76/100
Riverside is 20 points higher.
Atherton: Wildfire exposure derived from ingested fire potential tiles.
Riverside: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Atherton: 22/100 · Riverside: 32/100
Riverside is 10 points higher.
Atherton: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Riverside: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.