countyscore

Water Quality · Pennsylvania

Best Water Quality Counties in Pennsylvania 2026

Ranked by EPA drinking water health violations.

Top 10 — Water Quality in Pennsylvania

Score reflects water quality only — not overall county quality.

1Cameron County, PA
86
2Forest County, PA
86
3Fulton County, PA
86
4Philadelphia County, PA
86
5Montgomery County, PA
68.4
6Cumberland County, PA
66
7Westmoreland County, PA
65
8Lehigh County, PA
63.8
9Northumberland County, PA
63.2
10Allegheny County, PA
62

All Pennsylvania Counties — Water Quality Rankings

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

#CountyWater Quality ScoreOverall Score
1Cameron County, PA
86
61.1
2Forest County, PA
86
54.7
3Fulton County, PA
86
56
4Philadelphia County, PA
86
28.8
5Montgomery County, PA
68.4
44
6Cumberland County, PA
66
53
7Westmoreland County, PA
65
57
8Lehigh County, PA
63.8
40.7
9Northumberland County, PA
63.2
51.7
10Allegheny County, PA
62
43.6
11Bucks County, PA
58.7
53.1
12Lebanon County, PA
54.8
50.5
13Delaware County, PA
53.3
44.5
14Lawrence County, PA
52.5
52.2
15Berks County, PA
52
44
16Northampton County, PA
51.8
48.1
17Mifflin County, PA
51.5
46.2
18Butler County, PA
51.2
59.7
19Dauphin County, PA
50.2
40.7
20Union County, PA
49.3
55
21Blair County, PA
48.8
52.1
22Luzerne County, PA
48.6
39.3
23Columbia County, PA
48.1
55.4
24York County, PA
47.6
44.6
25Somerset County, PA
47.5
58.6
26Clearfield County, PA
46.5
57.9
27Fayette County, PA
44.3
45.7
28Huntingdon County, PA
44
59.2
29Erie County, PA
43.7
39
30Centre County, PA
43.3
57.8
31Lackawanna County, PA
43.1
43.8
32Lancaster County, PA
42.8
47.8
33Schuylkill County, PA
41.9
48.5
34Adams County, PA
41.8
53.4
35Franklin County, PA
40.2
46.9
36Chester County, PA
38.4
51.1
37Beaver County, PA
34.4
50.3
38Bradford County, PA
33.8
53.8
39Montour County, PA
32.1
60.1
40Mercer County, PA
30.9
51.1
41Elk County, PA
29.8
60.8
42Jefferson County, PA
29.7
60.8
43Susquehanna County, PA
29.1
57.1
44Clinton County, PA
28.9
56.1
45Lycoming County, PA
26.8
46.9
46Venango County, PA
26.6
56.8
47Washington County, PA
24.8
55.1
48Potter County, PA
24.1
58.9
49Snyder County, PA
23.4
51.7
50Tioga County, PA
22.4
53
51Clarion County, PA
22.2
58.4
52Crawford County, PA
21.2
52.4
53Cambria County, PA
20.8
57
54Carbon County, PA
19.3
50.2
55Greene County, PA
19.2
55.9
56Pike County, PA
18.4
51.1
57Monroe County, PA
15.5
42.5
58Juniata County, PA
15
56.7
59Perry County, PA
13
53.2
60Wayne County, PA
10.9
52.6
61Indiana County, PA
10.4
53
62Armstrong County, PA
10.3
56
63McKean County, PA
9.9
48.2
64Warren County, PA
9.4
52.3
65Bedford County, PA
9.2
58.4
66Wyoming County, PA
9
56.2
67Sullivan County, PA
8.5
60.4

Explore More

Best overall counties in PennsylvaniaFull Water Quality data on WaterByCounty