countyscore

Water Quality · South Carolina

Best Water Quality Counties in South Carolina 2026

Ranked by EPA drinking water health violations.

Top 10 — Water Quality in South Carolina

Score reflects water quality only — not overall county quality.

1Allendale County, SC
86
2Barnwell County, SC
86
3Calhoun County, SC
86
4Chester County, SC
86
5Clarendon County, SC
86
6Darlington County, SC
86
7Dillon County, SC
86
8Edgefield County, SC
86
9Florence County, SC
86
10Hampton County, SC
86

All South Carolina Counties — Water Quality Rankings

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

#CountyWater Quality ScoreOverall Score
1Allendale County, SC
86
43.9
2Barnwell County, SC
86
39.8
3Calhoun County, SC
86
47.8
4Chester County, SC
86
40.3
5Clarendon County, SC
86
42.7
6Darlington County, SC
86
44.9
7Dillon County, SC
86
40.3
8Edgefield County, SC
86
59
9Florence County, SC
86
39.5
10Hampton County, SC
86
39.2
11Jasper County, SC
86
34.6
12Kershaw County, SC
86
42.5
13Lancaster County, SC
86
44.8
14Lee County, SC
86
43.9
15Marion County, SC
86
46.2
16Marlboro County, SC
86
39.8
17Orangeburg County, SC
86
36.4
18Greenville County, SC
71.8
40.8
19Spartanburg County, SC
71.5
40.3
20Anderson County, SC
71.1
40.9
21Horry County, SC
68.4
39.4
22Laurens County, SC
68.4
43.8
23Greenwood County, SC
68.2
39
24Oconee County, SC
67.8
48
25Richland County, SC
64.8
36.7
26Sumter County, SC
64.8
35.2
27Newberry County, SC
63.8
43.4
28Charleston County, SC
63.2
43.4
29Pickens County, SC
63
50.4
30Dorchester County, SC
62.3
48.5
31York County, SC
61.3
44.5
32Beaufort County, SC
59.3
45.4
33Aiken County, SC
59.2
44.5
34Fairfield County, SC
56
45.3
35Lexington County, SC
53.8
38.3
36Georgetown County, SC
52.7
41.8
37Berkeley County, SC
51.4
35
38Colleton County, SC
50.1
31.7
39Cherokee County, SC
43.7
44.8
40Bamberg County, SC
38
39.5
41Chesterfield County, SC
28.8
43.2
42Abbeville County, SC
26.8
51
43Williamsburg County, SC
25.4
39.3
44Saluda County, SC
24.2
50.1
45McCormick County, SC
12.8
59.4
46Union County, SC
12.3
38.6

Explore More

Best overall counties in South CarolinaFull Water Quality data on WaterByCounty