City vs city
Columbia vs Mercersville, MD
Columbia currently scores 4 points higher overall than Mercersville, 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
Columbia: 35/100 · Mercersville: 31/100
Columbia is 4 points higher.
Flood
Columbia: 24/100 · Mercersville: 12/100
Columbia is 12 points higher.
Columbia: FEMA NFHL flood zones: 7 features intersect this tile.
Mercersville: FEMA NFHL flood zones: 1 features intersect this tile.
Wind
Columbia: 21/100 · Mercersville: 20/100
Columbia is 1 points higher.
Columbia: Wind exposure derived from ingested design wind / climatology tiles.
Mercersville: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Columbia: 39/100 · Mercersville: 23/100
Columbia is 16 points higher.
Columbia: Lightning exposure derived from ingested climatology tiles.
Mercersville: Lightning exposure derived from ingested climatology tiles.
Tornado
Columbia: 19/100 · Mercersville: 0/100
Columbia is 19 points higher.
Columbia: Tornado risk derived from NOAA SPC historical reports.
Mercersville: Tornado risk derived from NOAA SPC historical reports.
Hail
Columbia: 58/100 · Mercersville: 30/100
Columbia is 28 points higher.
Columbia: Hail risk derived from NOAA SPC historical reports.
Mercersville: Hail risk derived from NOAA SPC historical reports.
Storm surge
Columbia: Unavailable · Mercersville: Unavailable
A score difference cannot be calculated without both sources.
Columbia: Storm surge model is not available for this location yet.
Mercersville: Storm surge model is not available for this location yet.
Wildfire
Columbia: 40/100 · Mercersville: 57/100
Mercersville is 17 points higher.
Columbia: Wildfire exposure derived from ingested fire potential tiles.
Mercersville: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Columbia: 42/100 · Mercersville: 42/100
No gap.
Columbia: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Mercersville: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.