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privatewelldata / Counties

Well water by county: North Carolina

Across 57 counties in North Carolina, 13 of 340 sampled wells (4%) were above the arsenic limit and 95 of 1964 (5%) above the nitrate limit. Updated 2026-10-18. 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).

Share of sampled wells above the limit, by county (% of wells). Source: USGS/EPA Water Quality Portal · privatewelldata.com
CountyArsenic > 10 µg/LNitrate > 10 mg/L
Anson County–19% of 21
Beaufort County0% of 142% of 46
Bertie County–0% of 14
Bladen County–4% of 24
Brunswick County–0% of 93
Buncombe County0% of 170% of 17
Camden County–0% of 12
Carteret County–0% of 17
Chatham County–0% of 10
Chowan County–4% of 49
Columbus County–10% of 20
Craven County14% of 490% of 109
Cumberland County–0% of 10
Currituck County–0% of 15
Dare County–3% of 37
Duplin County–19% of 32
Durham County–0% of 16
Edgecombe County–17% of 29
Franklin County–0% of 14
Granville County–7% of 14
Greene County–23% of 87
Guilford County0% of 330% of 72
Halifax County–0% of 17
Harnett County–0% of 16
Hertford County–4% of 27
Hoke County–0% of 10
Hyde County–0% of 17
Iredell County0% of 230% of 26
Johnston County–7% of 74
Lee County–3% of 38
Lenoir County–0% of 26
Lincoln County–0% of 18
Martin County–0% of 27
Mecklenburg County4% of 960% of 92
Montgomery County–0% of 16
Moore County–7% of 14
Nash County–0% of 13
New Hanover County–0% of 123
Northampton County–7% of 14
Onslow County0% of 109% of 46
Orange County0% of 334% of 70
Pamlico County–0% of 22
Pasquotank County–0% of 35
Pender County0% of 100% of 23
Perquimans County–0% of 24
Person County–0% of 12
Pitt County–3% of 74
Randolph County7% of 140% of 14
Robeson County–0% of 20
Rockingham County5% of 190% of 21
Sampson County–26% of 69
Tyrrell County–0% of 12
Wake County0% of 2229% of 49
Warren County–6% of 18
Washington County–0% of 24
Wayne County–1% of 87
Wilson County–0% of 18