countyscore

Best Water Quality Counties in Oklahoma

EPA drinking water health violations and safety grades Compare rankings across all 77 counties.

Average Water Quality Score
16/100
Top County
Harper County
Counties Ranked
77

Top 10

#1
Harper County
OK
86/100
#2
Love County
OK
86/100
#3
Tulsa County
OK
70/100
#4
Oklahoma County
OK
64/100
#5
Pontotoc County
OK
46/100
#6
Beckham County
OK
42/100
#7
Woodward County
OK
40/100
#8
Mayes County
OK
39/100
#9
Texas County
OK
36/100
#10
Woods County
OK
33/100

All Oklahoma Counties Ranked

#CountyWater Quality ScoreOverall Score
1Harper County, OK
86
58.8
2Love County, OK
86
44.1
3Tulsa County, OK
70.4
38.4
4Oklahoma County, OK
63.8
34.4
5Pontotoc County, OK
46.4
42.9
6Beckham County, OK
41.6
42.9
7Woodward County, OK
40.4
38.1
8Mayes County, OK
39.2
37.8
9Texas County, OK
35.9
36.9
10Woods County, OK
33
56.8
11Harmon County, OK
32.5
54.5
12Cimarron County, OK
32.4
54.4
13Custer County, OK
31.6
41.4
14McClain County, OK
30.3
39.8
15Cleveland County, OK
29.8
31.5
16Comanche County, OK
29.2
26.7
17Garfield County, OK
29.2
29.1
18Ottawa County, OK
29.2
35.2
19Logan County, OK
28.9
40.8
20Ellis County, OK
26.9
54.6
21Creek County, OK
24.8
36.4
22Beaver County, OK
21.9
53.2
23Payne County, OK
19.9
30.1
24Sequoyah County, OK
18.3
36.8
25Adair County, OK
17.4
45.6
26Rogers County, OK
15.9
32.5
27Canadian County, OK
13.2
29.3
28Kay County, OK
12.7
34.7
29Grady County, OK
12.2
39.7
30Stephens County, OK
11.6
39.1
31Washington County, OK
11.5
42.2
32Washita County, OK
11.2
53.8
33Murray County, OK
11
44.5
34Carter County, OK
10.8
31.3
35Dewey County, OK
10.8
49.1
36Delaware County, OK
10.4
39
37Blaine County, OK
9.3
44
38Craig County, OK
8.5
39.4
39Alfalfa County, OK
8.4
57.7
40Bryan County, OK
7.5
35
41Johnston County, OK
7.2
49.7
42Roger Mills County, OK
6.9
58.7
43Cherokee County, OK
6.4
42.6
44Okfuskee County, OK
6.3
42.2
45Pottawatomie County, OK
5.4
33.1
46Marshall County, OK
5.3
39.3
47Kiowa County, OK
4.5
55.5
48Wagoner County, OK
4.5
41.5
49Greer County, OK
4.2
53.5
50Muskogee County, OK
4.1
31
51Jackson County, OK
4
36.9
52Grant County, OK
3.9
52.8
53Noble County, OK
3.9
43.8
54Caddo County, OK
3.8
41.3
55Coal County, OK
3.5
59.8
56Lincoln County, OK
3.3
46.6
57Le Flore County, OK
3.2
37.7
58Kingfisher County, OK
3
52.3
59Garvin County, OK
2.8
41.3
60Okmulgee County, OK
2.8
43.5
61Hughes County, OK
2.6
45.4
62McCurtain County, OK
2.3
41.7
63McIntosh County, OK
2.3
41.7
64Pittsburg County, OK
2.1
36.3
65Cotton County, OK
1.5
42
66Tillman County, OK
1.4
43.6
67Major County, OK
1.3
58.7
68Seminole County, OK
1.3
40.4
69Latimer County, OK
1.1
44.5
70Jefferson County, OK
1
49.2
71Pawnee County, OK
0.9
43.5
72Nowata County, OK
0.7
39.5
73Atoka County, OK
0.6
47
74Osage County, OK
0.6
34.6
75Haskell County, OK
0.5
50.7
76Pushmataha County, OK
0.4
51.6
77Choctaw County, OK
0.3
46.2

Data Source

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