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