Water quality by county
in Oregon
EPA sampled public water systems across Oregon for PFAS under its UCMR 5 programme. Of the 36 counties, 7 have a reading above a federal limit and 5 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 |
|---|---|---|---|
| Jackson County | 221,331 | 3.3× | PFHxS · 33.4 ng/L |
| Umatilla County | 80,491 | 3.0× | PFOS · 12 ng/L |
| Klamath County | 70,438 | 2.4× | PFOS · 9.5 ng/L |
| Lane County | 382,396 | 2.4× | PFOS · 9.4 ng/L |
| Deschutes County | 211,535 | 2.0× | PFOA · 7.9 ng/L |
| Clackamas County | 425,857 | 1.8× | PFOS · 7 ng/L |
| Yamhill County | 110,886 | 1.4× | PFOS · 5.4 ng/L |
| Marion County | 352,867 | under the limit | PFHxS · 3.9 ng/L |
| Baker County | 16,750 | under the limit | — |
| Benton County | 98,899 | under the limit | — |
| Clatsop County | 41,043 | under the limit | — |
| Columbia County | 54,063 | under the limit | — |
| Coos County | 64,326 | under the limit | — |
| Crook County | 27,336 | under the limit | — |
| Curry County | 22,774 | under the limit | — |
| Douglas County | 112,255 | under the limit | — |
| Gilliam County | 1,971 | under the limit | — |
| Grant County | 7,093 | not sampled | — |
| Harney County | 7,402 | not sampled | — |
| Hood River County | 23,764 | under the limit | — |
| Jefferson County | 25,536 | under the limit | — |
| Josephine County | 88,276 | under the limit | — |
| Lake County | 8,194 | under the limit | — |
| Lincoln County | 51,212 | under the limit | — |
| Linn County | 132,474 | under the limit | — |
| Malheur County | 32,315 | under the limit | — |
| Morrow County | 12,360 | under the limit | — |
| Multnomah County | 795,897 | under the limit | — |
| Polk County | 90,549 | under the limit | — |
| Sherman County | 2,002 | not sampled | — |
| Tillamook County | 27,264 | under the limit | — |
| Union County | 26,058 | under the limit | — |
| Wallowa County | 7,522 | not sampled | — |
| Wasco County | 26,507 | under the limit | — |
| Washington County | 611,272 | under the limit | — |
| Wheeler County | 1,456 | not sampled | — |