countyscore

Best Water Quality Counties in Kentucky

EPA drinking water health violations and safety grades Compare rankings across all 120 counties.

Average Water Quality Score
64/100
Top County
Allen County
Counties Ranked
118

Top 10

#1
Allen County
KY
86/100
#2
Ballard County
KY
86/100
#3
Barren County
KY
86/100
#4
Boone County
KY
86/100
#5
Boyle County
KY
86/100
#6
Bracken County
KY
86/100
#7
Breckinridge County
KY
86/100
#8
Bullitt County
KY
86/100
#9
Caldwell County
KY
86/100
#10
Calloway County
KY
86/100

All Kentucky Counties Ranked

#CountyWater Quality ScoreOverall Score
1Allen County, KY
86
64.3
2Ballard County, KY
86
56.1
3Barren County, KY
86
53.3
4Boone County, KY
86
47.3
5Boyle County, KY
86
55.2
6Bracken County, KY
86
61.3
7Breckinridge County, KY
86
65
8Bullitt County, KY
86
49.5
9Caldwell County, KY
86
63.9
10Calloway County, KY
86
55
11Carlisle County, KY
86
62.5
12Casey County, KY
86
67.4
13Christian County, KY
86
38.9
14Clark County, KY
86
47.5
15Daviess County, KY
86
41.9
16Elliott County, KY
86
72.6
17Fayette County, KY
86
37.5
18Fleming County, KY
86
65.1
19Franklin County, KY
86
46
20Gallatin County, KY
86
59.1
21Garrard County, KY
86
54.2
22Graves County, KY
86
56
23Grayson County, KY
86
62.1
24Green County, KY
86
68.3
25Hancock County, KY
86
68.7
26Hart County, KY
86
63.6
27Henderson County, KY
86
46.2
28Henry County, KY
86
51.7
29Hickman County, KY
86
67.9
30Jefferson County, KY
86
34.3
31Johnson County, KY
86
67.4
32Kenton County, KY
86
49.8
33Knott County, KY
86
67.8
34Larue County, KY
86
61.6
35Lawrence County, KY
86
61.4
36Lee County, KY
86
61.7
37Leslie County, KY
86
70.1
38Lewis County, KY
86
64.8
39Marshall County, KY
86
56.8
40Mason County, KY
86
51.8
41McCracken County, KY
86
46.1
42McCreary County, KY
86
69.1
43Meade County, KY
86
58.1
44Metcalfe County, KY
86
64
45Nicholas County, KY
86
65.3
46Oldham County, KY
86
57.2
47Pendleton County, KY
86
59.5
48Perry County, KY
86
60.6
49Powell County, KY
86
60.1
50Pulaski County, KY
86
57.1
51Robertson County, KY
86
67.1
52Rockcastle County, KY
86
72.7
53Scott County, KY
86
49.4
54Shelby County, KY
86
48.4
55Simpson County, KY
86
48.2
56Spencer County, KY
86
59.3
57Taylor County, KY
86
60
58Trigg County, KY
86
60
59Trimble County, KY
86
63.7
60Warren County, KY
86
41.8
61Washington County, KY
86
65.8
62Wayne County, KY
86
63
63Wolfe County, KY
86
71
64Hardin County, KY
70.6
48.1
65Madison County, KY
69.7
47.6
66Laurel County, KY
69
51.1
67Marion County, KY
64
62.5
68Adair County, KY
63.4
65.7
69Butler County, KY
60.8
67.9
70Todd County, KY
60.1
56.7
71Estill County, KY
59.6
58.7
72Bell County, KY
59.3
53
73Grant County, KY
55.8
59.4
74Morgan County, KY
55.4
62.4
75Mercer County, KY
53.9
60.1
76Knox County, KY
53.3
56.5
77Bourbon County, KY
52.7
51.3
78Lincoln County, KY
52
63.5
79Carter County, KY
51.8
66.3
80Rowan County, KY
51.1
58.7
81Clay County, KY
48.9
56.3
82Owsley County, KY
48.2
68.8
83Boyd County, KY
47.8
45.1
84Woodford County, KY
46
56.3
85Ohio County, KY
45.5
56.7
86Jessamine County, KY
43.3
47.5
87Nelson County, KY
41.8
54.6
88Russell County, KY
41.4
65.5
89Cumberland County, KY
40.8
70.5
90Greenup County, KY
40.1
58.8
91Harlan County, KY
39.5
58.1
92Harrison County, KY
39.4
60.5
93Anderson County, KY
39
59.6
94Hopkins County, KY
38.2
50.9
95Carroll County, KY
37.5
59.7
96Clinton County, KY
35.6
70
97Fulton County, KY
33.7
50.5
98Jackson County, KY
33
62.7
99Martin County, KY
32.5
67.3
100Pike County, KY
31
56.7
101Bath County, KY
29
56.2
102Logan County, KY
28.8
56.2
103Whitley County, KY
28.7
64.4
104Magoffin County, KY
28.1
64.8
105Floyd County, KY
27.2
61.3
106Muhlenberg County, KY
25.8
57.9
107Monroe County, KY
22.8
66.2
108Lyon County, KY
21.5
63.7
109Crittenden County, KY
20
63.7
110Menifee County, KY
18.4
68.8
111Montgomery County, KY
18.4
44.2
112Breathitt County, KY
18.2
59.8
113Letcher County, KY
14.8
62.3
114Edmonson County, KY
14.6
65.5
115Livingston County, KY
12.6
59
116McLean County, KY
12.4
69.7
117Union County, KY
7.3
60.1
118Webster County, KY
5.1
51.6

Data Source

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