Well water by county: Virginia
Across 36 counties in Virginia, 4 of 298 sampled wells (1%) were above the arsenic limit and 48 of 1394 (3%) above the nitrate limit. Updated 2026-10-17. Source: Water Quality Portal (USGS, EPA, NWQMC), siteType=Well.
Share of sampled wells whose latest result is above the EPA limit (arsenic 10 µg/L, nitrate 10 mg/L as N).
| County | Arsenic > 10 µg/L | Nitrate > 10 mg/L |
|---|---|---|
| Accomack County | 5% of 41 | 5% of 97 |
| Augusta County | 0% of 10 | 0% of 10 |
| Buchanan County | – | 0% of 61 |
| Caroline County | – | 10% of 58 |
| Carroll County | 0% of 10 | 0% of 12 |
| Charles City County | – | 0% of 25 |
| Chesapeake City | – | 0% of 37 |
| Clarke County | – | 3% of 37 |
| Culpeper County | – | 7% of 29 |
| Fairfax County | 0% of 12 | 3% of 32 |
| Fauquier County | 9% of 11 | 0% of 17 |
| Floyd County | 0% of 11 | 0% of 13 |
| Gloucester County | – | 0% of 17 |
| Hanover County | – | 0% of 20 |
| Henrico County | – | 0% of 14 |
| Isle of Wight County | 0% of 17 | 0% of 37 |
| James City County | – | 0% of 92 |
| King William County | 0% of 14 | 0% of 52 |
| King and Queen County | – | 0% of 13 |
| Lancaster County | – | 0% of 15 |
| Loudoun County | – | 0% of 26 |
| Middlesex County | – | 0% of 14 |
| New Kent County | – | 0% of 28 |
| Newport News City | – | 0% of 14 |
| Northampton County | 0% of 46 | 21% of 112 |
| Northumberland County | 0% of 10 | 0% of 29 |
| Prince William County | 0% of 54 | 1% of 128 |
| Richmond County | – | 0% of 11 |
| Rockingham County | 0% of 23 | 12% of 50 |
| Southampton County | 0% of 10 | 5% of 22 |
| Suffolk City | 7% of 14 | 0% of 70 |
| Surry County | – | 0% of 35 |
| Sussex County | 0% of 15 | 0% of 30 |
| Virginia Beach City | – | 3% of 39 |
| Westmoreland County | – | 0% of 25 |
| York County | – | 1% of 73 |