New York water quality by county
62 counties with public water systems. Pick a county to see every system that serves it.
| County | Active systems | People served | Share with violations, 3 yr | Serious violators | Health flags |
|---|---|---|---|---|---|
| Albany County | 70 | 305,597 | 1 | 5 | |
| Allegany County | 79 | 34,199 | 0 | 0 | |
| Bronx County | 1 | 8,271,000 | 0 | 1 | |
| Broome County | 169 | 176,964 | 4 | 5 | |
| Cattaraugus County | 148 | 66,122 | 0 | 1 | |
| Cayuga County | 88 | 61,743 | 0 | 0 | |
| Chautauqua County | 194 | 126,511 | 0 | 3 | |
| Chemung County | 77 | 120,180 | 0 | 0 | |
| Chenango County | 99 | 27,940 | 0 | 0 | |
| Clinton County | 165 | 107,915 | 0 | 2 | |
| Columbia County | 207 | 108,302 | 1 | 2 | |
| Cortland County | 76 | 49,794 | 0 | 0 | |
| Delaware County | 135 | 31,018 | 3 | 6 | |
| Dutchess County | 546 | 257,834 | 4 | 5 | |
| Erie County | 107 | 955,538 | 1 | 1 | |
| Essex County | 138 | 44,452 | 0 | 1 | |
| Franklin County | 88 | 39,077 | 0 | 0 | |
| Fulton County | 114 | 46,471 | 0 | 1 | |
| Genesee County | 29 | 47,122 | 0 | 0 | |
| Greene County | 193 | 47,019 | 5 | 10 | |
| Hamilton County | 82 | 14,184 | 0 | 0 | |
| Herkimer County | 123 | 48,130 | 2 | 2 | |
| Jefferson County | 156 | 130,530 | 0 | 2 | |
| Kings County | 1 | 8,271,000 | 0 | 1 | |
| Lewis County | 67 | 16,454 | 0 | 0 | |
| Livingston County | 50 | 54,699 | 0 | 0 | |
| Madison County | 94 | 31,704 | 0 | 0 | |
| Monroe County | 18 | 776,771 | 0 | 2 | |
| Montgomery County | 54 | 38,902 | 0 | 0 | |
| Nassau County | 44 | 1,387,479 | 0 | 0 | |
| New York County | 1 | 8,271,000 | 0 | 1 | |
| Niagara County | 21 | 223,670 | 0 | 0 | |
| Oneida County | 124 | 203,234 | 0 | 0 | |
| Onondaga County | 89 | 615,939 | 1 | 1 | |
| Ontario County | 53 | 93,056 | 0 | 0 | |
| Orange County | 454 | 415,907 | 15 | 3 | |
| Orleans County | 23 | 564,323 | 0 | 1 | |
| Oswego County | 163 | 99,946 | 0 | 2 | |
| Otsego County | 190 | 45,410 | 6 | 6 | |
| Putnam County | 382 | 56,607 | 0 | 4 | |
| Queens County | 1 | 8,271,000 | 0 | 1 | |
| Rensselaer County | 148 | 135,273 | 0 | 0 | |
| Richmond County | 1 | 8,271,000 | 0 | 1 | |
| Rockland County | 53 | 330,406 | 0 | 0 | |
| Saratoga County | 215 | 197,745 | 0 | 2 | |
| Schenectady County | 36 | 146,563 | 0 | 1 | |
| Schoharie County | 66 | 20,190 | 0 | 0 | |
| Schuyler County | 64 | 10,010 | 1 | 1 | |
| Seneca County | 87 | 27,760 | 0 | 1 | |
| St. Lawrence County | 227 | 80,865 | 0 | 0 | |
| Steuben County | 152 | 57,937 | 0 | 0 | |
| Suffolk County | 146 | 1,387,702 | 0 | 0 | |
| Sullivan County | 498 | 131,627 | 0 | 1 | |
| Tioga County | 94 | 38,613 | 0 | 0 | |
| Tompkins County | 111 | 102,827 | 0 | 3 | |
| Ulster County | 447 | 133,145 | 1 | 3 | |
| Warren County | 231 | 84,499 | 0 | 1 | |
| Washington County | 116 | 44,000 | 0 | 0 | |
| Wayne County | 33 | 86,592 | 0 | 0 | |
| Westchester County | 273 | 996,244 | 1 | 3 | |
| Wyoming County | 92 | 31,141 | 0 | 3 | |
| Yates County | 67 | 19,634 | 0 | 0 |
under 30% 30 to 59% 60% and over
About this data
Share with violations counts any violation in the past three years, including monitoring and reporting lapses. Counts cover active systems; systems serving more than one county are counted in each.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The New York records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.