countyscore

Water Quality · Delaware

Best Water Quality Counties in Delaware 2026

Ranked by EPA drinking water health violations.

Top 10 — Water Quality in Delaware

Score reflects water quality only — not overall county quality.

1New Castle County, DE
86
2Kent County, DE
56.8
3Sussex County, DE
55.6

All Delaware Counties — Water Quality Rankings

3 counties ranked by water quality score. Overall Score shown for context.

#CountyWater Quality ScoreOverall Score
1New Castle County, DE
86
44.3
2Kent County, DE
56.8
44.2
3Sussex County, DE
55.6
50.4

Explore More

Best overall counties in DelawareFull Water Quality data on WaterByCounty