City vs city
Petaluma vs St. Helena, CA
Petaluma currently scores 5 points higher overall than St. Helena, 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 is a current EPA AirNow signal; 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
Petaluma: 28/100 · St. Helena: 23/100
Petaluma is 5 points higher.
Flood
Petaluma: 35/100 · St. Helena: 31/100
Petaluma is 4 points higher.
Petaluma: FEMA NFHL flood zones: 10 features intersect this tile.
St. Helena: FEMA NFHL flood zones: 4 features intersect this tile.
Wind
Petaluma: 2/100 · St. Helena: 2/100
No gap.
Petaluma: Wind exposure derived from ingested design wind / climatology tiles.
St. Helena: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Petaluma: 0/100 · St. Helena: 0/100
No gap.
Petaluma: Lightning exposure derived from ingested climatology tiles.
St. Helena: Lightning exposure derived from ingested climatology tiles.
Tornado
Petaluma: 0/100 · St. Helena: 0/100
No gap.
Petaluma: Tornado risk derived from NOAA SPC historical reports.
St. Helena: Tornado risk derived from NOAA SPC historical reports.
Hail
Petaluma: 12/100 · St. Helena: 1/100
Petaluma is 11 points higher.
Petaluma: Hail risk derived from NOAA SPC historical reports.
St. Helena: Hail risk derived from NOAA SPC historical reports.
Storm surge
Petaluma: Unavailable · St. Helena: Unavailable
A score difference cannot be calculated without both sources.
Petaluma: Storm surge model is not available for this location yet.
St. Helena: Storm surge model is not available for this location yet.
Wildfire
Petaluma: 69/100 · St. Helena: 56/100
Petaluma is 13 points higher.
Petaluma: Wildfire exposure derived from ingested fire potential tiles.
St. Helena: Wildfire exposure derived from ingested fire potential tiles.
Current air quality
Petaluma: 24/100 · St. Helena: 26/100
St. Helena is 2 points higher.
Petaluma: Air quality signal derived from the latest EPA AirNow combined AQI grid.
St. Helena: Air quality signal derived from the latest EPA AirNow combined AQI grid.