City vs city
Brea vs Diamond Bar, CA
Brea and Diamond Bar are tied on overall score, with the biggest factor difference 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
Brea: 20/100 · Diamond Bar: 20/100
No gap.
Flood
Brea: 30/100 · Diamond Bar: 30/100
No gap.
Brea: FEMA NFHL flood zones: 4 features intersect this tile.
Diamond Bar: FEMA NFHL flood zones: 4 features intersect this tile.
Wind
Brea: 5/100 · Diamond Bar: 5/100
No gap.
Brea: Wind exposure derived from ingested design wind / climatology tiles.
Diamond Bar: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Brea: 1/100 · Diamond Bar: 1/100
No gap.
Brea: Lightning exposure derived from ingested climatology tiles.
Diamond Bar: Lightning exposure derived from ingested climatology tiles.
Tornado
Brea: 4/100 · Diamond Bar: 4/100
No gap.
Brea: Tornado risk derived from NOAA SPC historical reports.
Diamond Bar: Tornado risk derived from NOAA SPC historical reports.
Hail
Brea: 1/100 · Diamond Bar: 1/100
No gap.
Brea: Hail risk derived from NOAA SPC historical reports.
Diamond Bar: Hail risk derived from NOAA SPC historical reports.
Storm surge
Brea: Unavailable · Diamond Bar: Unavailable
A score difference cannot be calculated without both sources.
Brea: Storm surge model is not available for this location yet.
Diamond Bar: Storm surge model is not available for this location yet.
Wildfire
Brea: 73/100 · Diamond Bar: 73/100
No gap.
Brea: Wildfire exposure derived from ingested fire potential tiles.
Diamond Bar: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Brea: 28/100 · Diamond Bar: 28/100
No gap.
Brea: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Diamond Bar: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.