countyscore

Water Quality · New York

Best Water Quality Counties in New York 2026

Ranked by EPA drinking water health violations.

Top 10 — Water Quality in New York

Score reflects water quality only — not overall county quality.

1Orleans County, NY
86
2Niagara County, NY
71.3
3Suffolk County, NY
71.3
4Chemung County, NY
69.5
5Nassau County, NY
68.8
6Monroe County, NY
68.6
7St. Lawrence County, NY
68.6
8Erie County, NY
63.5
9Chenango County, NY
63
10Tompkins County, NY
57.8

All New York Counties — Water Quality Rankings

57 counties ranked by water quality score. Overall Score shown for context.

#CountyWater Quality ScoreOverall Score
1Orleans County, NY
86
51.8
2Niagara County, NY
71.3
42.5
3Suffolk County, NY
71.3
42.9
4Chemung County, NY
69.5
39.3
5Nassau County, NY
68.8
46.3
6Monroe County, NY
68.6
37.4
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
45.4
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
43.8
29Fulton County, NY
39.3
43.2
30Livingston County, NY
38.5
51.4
31Madison County, NY
38.3
47.8
32Albany County, NY
37.4
35.4
33Cattaraugus County, NY
37.2
46.3
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
59.4
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

Explore More

Best overall counties in New YorkFull Water Quality data on WaterByCounty