City vs city
Rock Hill vs Watts Mills, SC
Rock Hill currently scores 6 points higher overall than Watts Mills, with the largest gap in hail.
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
Rock Hill: 42/100 · Watts Mills: 36/100
Rock Hill is 6 points higher.
Flood
Rock Hill: 33/100 · Watts Mills: 24/100
Rock Hill is 9 points higher.
Rock Hill: FEMA NFHL flood zones: 13 features intersect this tile.
Watts Mills: FEMA NFHL flood zones: 3 features intersect this tile.
Wind
Rock Hill: 19/100 · Watts Mills: 18/100
Rock Hill is 1 points higher.
Rock Hill: Wind exposure derived from ingested design wind / climatology tiles.
Watts Mills: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Rock Hill: 46/100 · Watts Mills: 49/100
Watts Mills is 3 points higher.
Rock Hill: Lightning exposure derived from ingested climatology tiles.
Watts Mills: Lightning exposure derived from ingested climatology tiles.
Tornado
Rock Hill: 19/100 · Watts Mills: 23/100
Watts Mills is 4 points higher.
Rock Hill: Tornado risk derived from NOAA SPC historical reports.
Watts Mills: Tornado risk derived from NOAA SPC historical reports.
Hail
Rock Hill: 100/100 · Watts Mills: 45/100
Rock Hill is 55 points higher.
Rock Hill: Hail risk derived from NOAA SPC historical reports.
Watts Mills: Hail risk derived from NOAA SPC historical reports.
Storm surge
Rock Hill: Unavailable · Watts Mills: Unavailable
A score difference cannot be calculated without both sources.
Rock Hill: Storm surge model is not available for this location yet.
Watts Mills: Storm surge model is not available for this location yet.
Wildfire
Rock Hill: 52/100 · Watts Mills: 60/100
Watts Mills is 8 points higher.
Rock Hill: Wildfire exposure derived from ingested fire potential tiles.
Watts Mills: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Rock Hill: 24/100 · Watts Mills: 34/100
Watts Mills is 10 points higher.
Rock Hill: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Watts Mills: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.