City vs city
Half Moon Bay vs San Mateo, CA
San Mateo currently scores 10 points higher overall than Half Moon Bay, 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
Half Moon Bay: 16/100 · San Mateo: 26/100
San Mateo is 10 points higher.
Flood
Half Moon Bay: 47/100 · San Mateo: 40/100
Half Moon Bay is 7 points higher.
Half Moon Bay: FEMA NFHL flood zones: 8 features intersect this tile.
San Mateo: FEMA NFHL flood zones: 13 features intersect this tile.
Wind
Half Moon Bay: 1/100 · San Mateo: 2/100
San Mateo is 1 points higher.
Half Moon Bay: Wind exposure derived from ingested design wind / climatology tiles.
San Mateo: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Half Moon Bay: 0/100 · San Mateo: 0/100
No gap.
Half Moon Bay: Lightning exposure derived from ingested climatology tiles.
San Mateo: Lightning exposure derived from ingested climatology tiles.
Tornado
Half Moon Bay: 4/100 · San Mateo: 0/100
Half Moon Bay is 4 points higher.
Half Moon Bay: Tornado risk derived from NOAA SPC historical reports.
San Mateo: Tornado risk derived from NOAA SPC historical reports.
Hail
Half Moon Bay: 8/100 · San Mateo: 6/100
Half Moon Bay is 2 points higher.
Half Moon Bay: Hail risk derived from NOAA SPC historical reports.
San Mateo: Hail risk derived from NOAA SPC historical reports.
Storm surge
Half Moon Bay: Unavailable · San Mateo: Unavailable
A score difference cannot be calculated without both sources.
Half Moon Bay: Storm surge model is not available for this location yet.
San Mateo: Storm surge model is not available for this location yet.
Wildfire
Half Moon Bay: 13/100 · San Mateo: 59/100
San Mateo is 46 points higher.
Half Moon Bay: Wildfire exposure derived from ingested fire potential tiles.
San Mateo: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Half Moon Bay: 23/100 · San Mateo: 23/100
No gap.
Half Moon Bay: 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 Mateo: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.