Water quality by county
in New York
EPA sampled public water systems across New York for PFAS under its UCMR 5 programme. Of the 62 counties, 17 have a reading above a federal limit and 2 have not been sampled at all — which is not a clean result, only an absence of one. Each county below shows what was found, at what concentration, and at which utility.
| county | Population | Worst result | Compound |
|---|---|---|---|
| Westchester County | 1,006,447 | 28× | PFOA · 111.5 ng/L |
| Nassau County | 1,392,438 | 4.8× | PFOA · 19 ng/L |
| Suffolk County | 1,535,909 | 4.3× | PFOS · 17.4 ng/L |
| Rockland County | 348,144 | 3.5× | PFOA · 14 ng/L |
| Steuben County | 92,015 | 3.0× | PFOA · 12.2 ng/L |
| Orange County | 411,767 | 2.6× | PFOA · 10.5 ng/L |
| Delaware County | 44,191 | 2.6× | PFOA · 10.4 ng/L |
| Dutchess County | 299,963 | 2.1× | PFOA · 8.6 ng/L |
| Albany County | 319,964 | 2.1× | PFOA · 8.3 ng/L |
| Jefferson County | 113,140 | 1.8× | PFOA · 7.3 ng/L |
| Broome County | 196,397 | 1.6× | PFOA · 6.3 ng/L |
| Tioga County | 47,574 | 1.4× | PFOA · 5.4 ng/L |
| Schenectady County | 162,261 | 1.3× | PFOA · 5 ng/L |
| Sullivan County | 80,450 | 1.2× | PFNA · 12.3 ng/L |
| Greene County | 46,903 | 1.2× | PFOS · 4.9 ng/L |
| Warren County | 65,288 | 1.2× | PFOA · 4.7 ng/L |
| Ulster County | 182,977 | 1.1× | PFOA · 4.6 ng/L |
| Cortland County | 45,945 | under the limit | PFNA · 6.7 ng/L |
| Allegany County | 47,299 | under the limit | — |
| Bronx County | 1,384,724 | under the limit | — |
| Cattaraugus County | 75,475 | under the limit | — |
| Cayuga County | 74,567 | under the limit | — |
| Chautauqua County | 124,105 | under the limit | — |
| Chemung County | 81,115 | under the limit | — |
| Chenango County | 45,776 | under the limit | — |
| Clinton County | 77,871 | under the limit | — |
| Columbia County | 60,299 | under the limit | — |
| Erie County | 950,602 | under the limit | — |
| Essex County | 36,744 | under the limit | — |
| Franklin County | 47,086 | under the limit | — |
| Fulton County | 52,073 | under the limit | — |
| Genesee County | 57,604 | under the limit | — |
| Hamilton County | 5,082 | not sampled | — |
| Herkimer County | 59,585 | under the limit | — |
| Kings County | 2,617,631 | under the limit | — |
| Lewis County | 26,570 | under the limit | — |
| Livingston County | 61,561 | under the limit | — |
| Madison County | 67,072 | under the limit | — |
| Monroe County | 752,202 | under the limit | — |
| Montgomery County | 49,648 | under the limit | — |
| New York County | 1,660,664 | under the limit | — |
| Niagara County | 209,570 | under the limit | — |
| Oneida County | 228,347 | under the limit | — |
| Onondaga County | 469,812 | under the limit | — |
| Ontario County | 113,012 | under the limit | — |
| Orleans County | 39,686 | under the limit | — |
| Oswego County | 118,305 | under the limit | — |
| Otsego County | 60,524 | under the limit | — |
| Putnam County | 98,409 | under the limit | — |
| Queens County | 2,316,841 | under the limit | — |
| Rensselaer County | 160,749 | under the limit | — |
| Richmond County | 498,212 | under the limit | — |
| Saratoga County | 240,360 | under the limit | — |
| Schoharie County | 30,151 | under the limit | — |
| Schuyler County | 17,121 | not sampled | — |
| Seneca County | 32,650 | under the limit | — |
| St. Lawrence County | 106,198 | under the limit | — |
| Tompkins County | 105,602 | under the limit | — |
| Washington County | 59,839 | under the limit | — |
| Wayne County | 90,757 | under the limit | — |
| Wyoming County | 39,588 | under the limit | — |
| Yates County | 24,387 | under the limit | — |