Well water in Polk County, North Carolina
In Polk County, 4% of 401 private wells tested between 1998 and 2019 had lead above the North Carolina groundwater standard (15 ug/L), according to the NC State Laboratory of Public Health (NCWELL).
401 private wells tested 1998 to 2019 in state summaries; 2 individual samples from 1 wells, 2014. Data refreshed September 9, 2026.
What homeowner tests found
NCWELL private well summaries: private wells tested and reported to the state, 1998 to 2019. Shares are against the level the state applies to each contaminant, named in the last column; several are stricter than EPA.
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What this means
Among homeowners in Polk County who sent a sample to the state lab, the health-based limits most often exceeded were lead (4% of 401 wells) and copper (2% of 285 wells). These are ordinary wells tested by their owners, so the shares are the best available picture of a typical well here, with one caveat: people test more often when they suspect a problem.
Iron and manganese exceed the state's advisory level in a sizable share of wells; these are mostly a taste, staining or diet issue rather than a toxicity one.
What to test for in Polk County
- Volatile organic compounds (VOCs)67 leaking underground storage tank sites on record locally.
- Iron19% of 279 local wells tested were above the North Carolina groundwater standard.
- Manganese14% of 395 local wells tested were above the North Carolina groundwater standard.
- Lead4% of 401 local wells tested were above the North Carolina groundwater standard.
- Copper2% of 285 local wells tested were above the North Carolina groundwater standard.
- RadonMedian local reading is 2,940 pCi/L.
- E. coliAbove the limit in 1 of 1 local samples; too few to quote a rate.
- NitrateRecommended for every private well, especially near farms or septic systems.
Contamination sources on record in Polk County
NC DEQ records 67 leaking underground storage tank sites in Polk County, among 67 regulated sites in total. Groundwater does not follow property lines, so a well within a few hundred feet of one of these is worth testing for what that site could release.
- 67
- leaking underground storage tank sitesGasoline and heating oil that leaked from tanks move through groundwater as benzene, MTBE and other volatile organic compounds.
Treatment that fits the local profile
- Iron
- Oxidizing filter whole-house; Water softener (low levels); Aeration plus filtration
- Manganese
- Oxidizing filter (greensand, birm) whole-house; Water softener (low levels); Point-of-use reverse osmosis
- Radon
- Aeration (bubble-up or diffused) whole-house; Granular activated carbon whole-house (lower levels only)
Get your Polk County water tested at home
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Common questions
How high is radon in well water in Polk County?
The median radon level across 1 public samples in Polk County was 2,940 pCi/L, with a high of 2,940 pCi/L. New Hampshire recommends treatment above 2,000 pCi/L.
How often should I test a private well in Polk County?
Test for bacteria and nitrate every year. Test once for arsenic, uranium, radon, fluoride, manganese and PFAS, then again every three to five years or after any change in taste, color, or plumbing.
Sources
- USGS Water Quality Portal: 5 samples in Polk County. Data from the Water Quality Portal, a service of USGS, EPA and USDA; groundwater samples collected by USGS and cooperators. Retrieved September 3, 2026.
- NCWELL private well summaries: summaries for 7 contaminants in Polk County, up to 401 wells each. County summaries of private well tests run by the NC State Laboratory of Public Health, 1998 to 2019, compiled by the UNC Superfund Research Program (NCWELL database). Counts are tests, not distinct wells; since 2008 every new well is tested once, so most tests are unique wells. Shares are against the NC 2L groundwater standard where one exists (manganese 50 ug/L, lead 15, iron 300) and otherwise the EPA limit. Medians are not used because more than half of results sit at the reporting limit for most analytes. Retrieved September 9, 2026.
- NC DEQ regulated sites: 67 regulated sites located in Polk County. Underground storage tank incidents from the North Carolina Department of Environmental Quality UST Section. Retrieved September 9, 2026.
Non-detects count as samples and are treated as zero when computing medians. Exactly at the limit counts as not above it. A sample belongs to the town containing the well's reported coordinates.