privatewelldata / Counties / North Carolina
Wake County, North Carolina
Arsenic: 0 of 22 sampled wells (0%) above the EPA limit of 10 µg/L. Nitrate: 14 of 49 sampled wells (29%) above the EPA limit of 10 mg/L as N. Samples 1961-11-27 to 2007-12-17; updated 2026-10-18. Source: Water Quality Portal (USGS, EPA, NWQMC), siteType=Well.
What wells in this county have measured for arsenic and nitrate. A local picture only: test your own well to know your water.
Arsenic
0 of 22 sampled wells (0%) had a latest result above the EPA limit of 10 µg/L.
- Median (latest per well)
- 0 µg/L
- 90th percentile
- 0.36 µg/L
- Highest
- 1 µg/L
- Non-detects
- 13 wells' latest result was "not detected" with no detection limit reported; they are counted as below the limit.
- Samples
- 53, 2001-08-27 to 2007-12-17
- Source
- Water Quality Portal (USGS, EPA, NWQMC), siteType=Well, downloaded 2026-10-18
Nitrate
14 of 49 sampled wells (29%) had a latest result above the EPA limit of 10 mg/L as N.
- Median (latest per well)
- 1.28 mg/L as N
- 90th percentile
- 87.5 mg/L as N
- Highest
- Withheld for review: 4 wells' latest result was above 100 mg/L as N, far outside the usual range. They are still counted as above the limit.
- Non-detects
- 4 wells' latest result was "not detected" with no detection limit reported; they are counted as below the limit.
- Samples
- 93, 1961-11-27 to 2007-12-17
- Source
- Water Quality Portal (USGS, EPA, NWQMC), siteType=Well, downloaded 2026-10-18
Includes monitoring, research and private wells reported to the Water Quality Portal. Non-detects count only when the lab's detection limit is at or below the EPA limit. Method: data rules.
What to do next
- Test your own well. County numbers cannot tell you what is in your water. See which tests fit your well.
- Use a lab certified by North Carolina. Certified labs in North Carolina.
- Compare your results with the EPA limits (arsenic 10 µg/L, nitrate 10 mg/L as N). If a result is above a limit, contact your county or state health department.
- If a result is high: arsenic guide · nitrate guide · bacteria guide · salesperson checklist.
- Test again every year for bacteria and nitrate. Get a yearly reminder.