privatewelldata / Counties / North Carolina
Granville County, North Carolina
Nitrate: 1 of 14 sampled wells (7%) above the EPA limit of 10 mg/L as N. Samples 1961-12-14 to 2014-07-24; 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.
Nitrate
1 of 14 sampled wells (7%) had a latest result above the EPA limit of 10 mg/L as N.
- Median (latest per well)
- 0.963 mg/L as N
- 90th percentile
- 7.91 mg/L as N
- Highest
- 16.716 mg/L as N
- Samples
- 14, 1961-12-14 to 2014-07-24
- 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.