countyscore

Best Water Quality Counties in Indiana

EPA drinking water health violations and safety grades Compare rankings across all 92 counties.

Average Water Quality Score
52/100
Top County
Blackford County
Counties Ranked
92

Top 10

#1
Blackford County
IN
86/100
#2
Brown County
IN
86/100
#3
Fayette County
IN
86/100
#4
Floyd County
IN
86/100
#5
Hancock County
IN
86/100
#6
Henry County
IN
86/100
#7
Jay County
IN
86/100
#8
Jefferson County
IN
86/100
#9
Johnson County
IN
86/100
#10
Martin County
IN
86/100

All Indiana Counties Ranked

#CountyWater Quality ScoreOverall Score
1Blackford County, IN
86
61.4
2Brown County, IN
86
68.2
3Fayette County, IN
86
59.8
4Floyd County, IN
86
44
5Hancock County, IN
86
52.8
6Henry County, IN
86
61.3
7Jay County, IN
86
61.3
8Jefferson County, IN
86
59.2
9Johnson County, IN
86
47.3
10Martin County, IN
86
70.3
11Morgan County, IN
86
62.9
12Orange County, IN
86
66.3
13Owen County, IN
86
61.3
14Scott County, IN
86
57.3
15Switzerland County, IN
86
67.8
16Union County, IN
86
67.1
17Vanderburgh County, IN
86
33.2
18Marion County, IN
71.3
26
19St. Joseph County, IN
68.6
41.4
20Lake County, IN
68.4
34.4
21Harrison County, IN
67.1
60.1
22Jackson County, IN
66.8
51.5
23Greene County, IN
66.2
55.2
24Howard County, IN
65.8
45.3
25Vigo County, IN
65
32.2
26Allen County, IN
64.8
41.3
27Daviess County, IN
64.4
58.1
28Bartholomew County, IN
64.2
53.6
29Porter County, IN
63.8
49.4
30Tippecanoe County, IN
63.8
42.9
31Shelby County, IN
63.2
48.5
32Sullivan County, IN
62.6
57.4
33Hendricks County, IN
62.2
47.5
34Delaware County, IN
61.2
39.9
35Whitley County, IN
59.1
63.4
36Putnam County, IN
58.3
65.3
37Dearborn County, IN
57.5
62.9
38Marshall County, IN
57.1
56.9
39Grant County, IN
56.8
47.6
40Elkhart County, IN
56.4
36.6
41Noble County, IN
56.1
55.4
42Dubois County, IN
55.8
62.2
43Spencer County, IN
54.3
68.6
44Perry County, IN
53.9
59.4
45Hamilton County, IN
53.6
52.1
46Clark County, IN
53.5
40.2
47Fulton County, IN
53.2
64.4
48Madison County, IN
53
41.9
49Wayne County, IN
52
55.2
50Randolph County, IN
51.5
56.1
51Wells County, IN
51.4
64.9
52Tipton County, IN
50.5
65.2
53Knox County, IN
50.4
52.4
54Starke County, IN
50.4
59.7
55Clay County, IN
49.1
58
56Cass County, IN
48.8
51.3
57Newton County, IN
48.8
52.4
58Warrick County, IN
47.8
51.4
59Boone County, IN
47.7
55.4
60DeKalb County, IN
47.5
62.1
61Pike County, IN
46.2
64.3
62LaPorte County, IN
43.1
43.2
63Ripley County, IN
41.5
66
64Montgomery County, IN
40
52.2
65Monroe County, IN
39.8
43.3
66Vermillion County, IN
38
60.4
67Crawford County, IN
36.5
62.4
68Adams County, IN
34.7
58.3
69Clinton County, IN
34.6
56.5
70Gibson County, IN
34.1
55.9
71Pulaski County, IN
33.9
66.6
72Jennings County, IN
32.8
52.1
73Ohio County, IN
32.4
68.2
74Jasper County, IN
31.8
65.8
75White County, IN
31.4
60.6
76LaGrange County, IN
31.2
58
77Huntington County, IN
29.9
53.8
78Carroll County, IN
26.4
61.6
79Kosciusko County, IN
24.4
50.1
80Miami County, IN
23.5
62.9
81Lawrence County, IN
22.2
57.6
82Wabash County, IN
20.7
61.2
83Franklin County, IN
20.4
61.1
84Rush County, IN
20.3
64.3
85Benton County, IN
20.1
61
86Steuben County, IN
18.3
51
87Washington County, IN
15.1
57
88Fountain County, IN
13.8
62
89Warren County, IN
13
70.7
90Decatur County, IN
11.8
65.7
91Posey County, IN
11.7
60.5
92Parke County, IN
7.4
64

Data Source

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