countyscore

Best Water Quality Counties in Pennsylvania

EPA drinking water health violations and safety grades Compare rankings across all 67 counties.

Average Water Quality Score
39/100
Top County
Cameron County
Counties Ranked
67

Top 10

#1
Cameron County
PA
86/100
#2
Forest County
PA
86/100
#3
Fulton County
PA
86/100
#4
Philadelphia County
PA
86/100
#5
Montgomery County
PA
68/100
#6
Cumberland County
PA
66/100
#7
Westmoreland County
PA
65/100
#8
Lehigh County
PA
64/100
#9
Northumberland County
PA
63/100
#10
Allegheny County
PA
62/100

All Pennsylvania Counties Ranked

#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
50.6
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
39.4
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
48.3
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

Data Source

Water Quality data from WaterByCounty. See full details at WaterByCounty. Data updated February 2026.