Water quality by county
in South Carolina
EPA sampled public water systems across South Carolina for PFAS under its UCMR 5 programme. Of the 46 counties, 27 have a reading above a federal limit and 3 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 |
|---|---|---|---|
| Abbeville County | 24,607 | 14× | HFPO-DA · 140 ng/L |
| Laurens County | 70,545 | 9.6× | HFPO-DA · 95.8 ng/L |
| Greenwood County | 70,041 | 9.1× | HFPO-DA · 91 ng/L |
| Anderson County | 217,183 | 8.3× | HFPO-DA · 82.9 ng/L |
| Fairfield County | 20,369 | 8.2× | PFOS · 32.8 ng/L |
| Cherokee County | 57,770 | 4.8× | PFOS · 19.4 ng/L |
| Saluda County | 19,452 | 3.9× | HFPO-DA · 39 ng/L |
| Lexington County | 313,774 | 3.8× | PFOS · 15 ng/L |
| Horry County | 413,391 | 2.9× | PFOS · 11.5 ng/L |
| Newberry County | 39,203 | 2.8× | PFOS · 11.3 ng/L |
| Georgetown County | 66,035 | 2.4× | PFOS · 9.7 ng/L |
| Kershaw County | 71,698 | 2.3× | PFOS · 9.3 ng/L |
| McCormick County | 9,983 | 2.2× | PFOS · 8.8 ng/L |
| Richland County | 430,651 | 2.1× | PFOS · 8.6 ng/L |
| Charleston County | 431,001 | 2.1× | PFOS · 8.5 ng/L |
| Dorchester County | 174,663 | 2.0× | PFOS · 8.1 ng/L |
| Berkeley County | 264,276 | 2.0× | PFOS · 8 ng/L |
| Sumter County | 104,776 | 1.9× | PFHxS · 19 ng/L |
| Florence County | 138,049 | 1.7× | PFOS · 6.7 ng/L |
| Union County | 26,678 | 1.5× | PFOS · 6.1 ng/L |
| Beaufort County | 201,775 | 1.4× | PFOA · 5.6 ng/L |
| Chesterfield County | 44,488 | 1.3× | PFOS · 5.3 ng/L |
| Aiken County | 179,245 | 1.2× | PFOA · 4.8 ng/L |
| Chester County | 32,323 | 1.2× | PFOS · 4.7 ng/L |
| Spartanburg County | 369,256 | 1.2× | PFOA · 4.7 ng/L |
| Orangeburg County | 83,129 | 1.1× | PFOS · 4.2 ng/L |
| Lancaster County | 111,652 | 1.0× | PFOA · 4 ng/L |
| Allendale County | 7,551 | under the limit | — |
| Bamberg County | 12,870 | under the limit | — |
| Barnwell County | 20,495 | under the limit | — |
| Calhoun County | 14,249 | not sampled | — |
| Clarendon County | 31,030 | under the limit | — |
| Colleton County | 39,259 | under the limit | — |
| Darlington County | 62,425 | under the limit | — |
| Dillon County | 27,577 | under the limit | — |
| Edgefield County | 29,455 | under the limit | — |
| Greenville County | 570,745 | under the limit | — |
| Hampton County | 18,172 | not sampled | — |
| Jasper County | 35,618 | not sampled | — |
| Lee County | 15,958 | under the limit | — |
| Marion County | 28,368 | under the limit | — |
| Marlboro County | 25,498 | under the limit | — |
| Oconee County | 82,475 | under the limit | — |
| Pickens County | 138,207 | under the limit | — |
| Williamsburg County | 29,865 | under the limit | — |
| York County | 303,001 | under the limit | — |