countyscore

Best Water Quality Counties in New York

EPA drinking water health violations and safety grades Compare rankings across all 62 counties.

Average Water Quality Score
40/100
Top County
Orleans County
Counties Ranked
57

Top 10

#1
Orleans County
NY
86/100
#2
Niagara County
NY
71/100
#3
Suffolk County
NY
71/100
#4
Chemung County
NY
70/100
#5
Nassau County
NY
69/100
#6
Monroe County
NY
69/100
#7
St. Lawrence County
NY
69/100
#8
Erie County
NY
64/100
#9
Chenango County
NY
63/100
#10
Tompkins County
NY
58/100

All New York Counties Ranked

#CountyWater Quality ScoreOverall Score
1Orleans County, NY
86
51.8
2Niagara County, NY
71.3
42.6
3Suffolk County, NY
71.3
42.9
4Chemung County, NY
69.5
39.4
5Nassau County, NY
68.8
46.3
6Monroe County, NY
68.6
37.5
7St. Lawrence County, NY
68.6
51.3
8Erie County, NY
63.5
36.7
9Chenango County, NY
63
46.5
10Tompkins County, NY
57.8
38.4
11Broome County, NY
57.5
37.3
12Chautauqua County, NY
56.4
41.2
13Onondaga County, NY
54
36.8
14Warren County, NY
52
46
15Cortland County, NY
51.4
38.9
16Oneida County, NY
51
39
17Tioga County, NY
50.3
53.8
18Rockland County, NY
49.1
42.6
19Clinton County, NY
48.1
51.9
20Schenectady County, NY
47.4
34.1
21Ulster County, NY
47
45.5
22Oswego County, NY
45.2
42.8
23Rensselaer County, NY
43.5
39.9
24Allegany County, NY
43.1
59.1
25Otsego County, NY
41.2
53.8
26Genesee County, NY
40.6
46.7
27Wayne County, NY
40.5
49.6
28Dutchess County, NY
39.8
43.9
29Fulton County, NY
39.3
43.2
30Livingston County, NY
38.5
51.4
31Madison County, NY
38.3
47.9
32Albany County, NY
37.4
35.4
33Cattaraugus County, NY
37.2
46.4
34Wyoming County, NY
36.8
58.6
35Essex County, NY
34.9
59.1
36Yates County, NY
34.1
51.3
37Saratoga County, NY
33.2
50.6
38Westchester County, NY
32.4
45.6
39Delaware County, NY
30.9
50.2
40Ontario County, NY
29
47.6
41Seneca County, NY
28.8
45.3
42Steuben County, NY
28
51.3
43Cayuga County, NY
25.6
43.8
44Schuyler County, NY
24.6
58.2
45Sullivan County, NY
24.5
44.6
46Columbia County, NY
24
49
47Herkimer County, NY
21.1
47.1
48Orange County, NY
19.7
42.1
49Greene County, NY
19.1
51.9
50Jefferson County, NY
17.3
41.1
51Washington County, NY
17.2
50.2
52Montgomery County, NY
16.2
40.1
53Lewis County, NY
14.4
59.5
54Franklin County, NY
14.3
53.1
55Schoharie County, NY
8.8
53.8
56Hamilton County, NY
6.7
63
57Putnam County, NY
4.3
55.2

Data Source

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