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Health problems are rare in tested Iredell County wells.

All 7 health checks came back rare here.

From 26 wells tested in Iredell County since 2002; your own well needs its own test. How to read this

Tested wells over the limit IredellNorth Carolina
Manganese4%1 of 23Radon0%0 of 24Nitrate0%0 of 26Lead0%0 of 23Arsenic0%0 of 23Uranium0%0 of 26Fluoride0%0 of 23
GermsTest every year, whatever the chart says
Coliform bacteria0%0 of 1E. coli0%0 of 1
StainsNot a health risk
Iron stains0%0 of 23

Rare: under 5%Worth checking: 5 to 15%Widespread: 15%+

Lab results: Water Quality Portal (USGS and EPA)

Who drinks from a well here

1 in 4 people 51,328 people

Nobody else tests these wells. Only you do.

People on wells: EPA researchers' 2020 estimate

Radon risk (a gas from rock)

Possible here. A home air test is inexpensive.

Radon zones: EPA map

Here's how Iredell County compares with North Carolina and the counties around it.

Each result puts Iredell County next to the 9 counties that border it, on the chart's 0 to 50% scale.

All 7 health checks are rare in Iredell County.

Manganese1 of 23 wells over

1 of 23 wells tested here from 2002 to 2014 was over the EPA health advisory of 0.3 mg/L, against about 1 in 15 across North Carolina. Half the results were under 0.006 mg/L, and the top 1 in 10 were 0.088 mg/L or more. That's a bigger share than in 7 of the 9 other North Carolina counties with 10 or more tested wells, leaving out 2 counties whose results are likely overstated.

Manganese guide

Radon in water0 of 24 wells over

None of the 24 wells tested here from 2002 to 2014 were over 4,000 pCi/L, a level the EPA proposed, against about 1 in 7 across North Carolina. Half the results were under 270 pCi/L, and the top 1 in 10 were 1,430 pCi/L or more.

Radon guide

Nitrate0 of 26 wells over

None of the 26 wells tested here from 2002 to 2014 were over the EPA limit of 10 mg/L, against about 1 in 10 across North Carolina. Half the results were under 0.22 mg/L, and the top 1 in 10 were 1.5 mg/L or more. Iredell County had none, while 2 of the 10 other North Carolina counties with 10 or more tested wells had at least one, leaving out 2 counties whose results are likely overstated.

Nitrate guide

Lead0 of 23 wells over

None of the 23 wells tested here from 2003 to 2014 were over the EPA action level of 15 µg/L, against under 1 in 50 across North Carolina. At least half the results were too low for the lab to measure, and the top 1 in 10 were 0.31 µg/L or more. Iredell County had none, and neither did any of the 6 other North Carolina counties with 10 or more tested wells.

Lead guide

Arsenic0 of 23 wells over

None of the 23 wells tested here from 2002 to 2014 were over the EPA limit of 10 µg/L, against under 1 in 50 across North Carolina. Iredell County had none, and neither did any of the 5 other North Carolina counties with 10 or more tested wells, leaving out 1 county whose results are likely overstated.

Arsenic guide

Uranium0 of 26 wells over

None of the 26 wells tested here from 2003 to 2014 were over the EPA limit of 30 µg/L, against under 1 in 100 across North Carolina. At least half the results were too low for the lab to measure, and the top 1 in 10 were 1.8 µg/L or more. Iredell County had none, and neither did any of the 6 other North Carolina counties with 10 or more tested wells, leaving out 1 county whose results are likely overstated.

Uranium guide

Fluoride0 of 23 wells over

None of the 23 wells tested here from 2002 to 2014 were over the EPA limit of 4 mg/L, against none across North Carolina. Iredell County had none, and neither did any of the 11 other North Carolina counties with 10 or more tested wells.

None of the 1 Iredell County wells tested for bacteria had it, but every well needs a yearly test.

Coliform bacteria0 of 1 wells had it

None of the 1 wells tested here in 2014 had coliform bacteria, against about 4 in 10 across North Carolina.

Bacteria guide

E. coli0 of 1 wells had it

None of the 1 wells tested here in 2014 had E. coli, against about 1 in 16 across North Carolina.

E. coli means human or animal waste is getting in, so if a test of your Iredell County well finds it, boil drinking water until the well is fixed.

Bacteria guide

Iron reached staining levels in 0 of 23 tested wells, and it isn't a health risk.

Iron stains0 of 23 wells had it

None of the 23 wells tested here from 2002 to 2014 had enough iron to stain, against about 4 in 10 across North Carolina.

Iron guide

Most of the 26 wells tested in Iredell County were last tested before 2010.

25 wells had a test in the 2000s and 1 in the 2010s.

An old result shows the water as it was then, so treat these 26 wells as a starting point and test your own.

Most Iredell County wells in these records were tested for research or because someone suspected a problem, which can push the shares above what a typical home well would show (how we read the numbers).

One mail-in lab test covers the 3 things to check in Iredell County.

  • Bacteria
  • Nitrate
  • Arsenic

What North Carolina offers well owners

Here's what we know about radon and PFAS in Iredell County.

Iredell County is in the EPA's middle radon zone. An indoor air test is cheap and tells you whether to look at your water. Radon guide

Between 2023 and 2025 the EPA had 7 town water systems in Iredell County test for PFAS. 2 of them had at least one test above 4 ng/L, the new EPA limit for PFOA and PFOS. The highest single result was 19 ng/L of PFOA. No well in Iredell County has public PFAS results, so the town systems are the best clue to what's in the groundwater nearby. PFAS guide

Radon zones: EPA Map of Radon Zones. PFAS: EPA tests of town water systems, 2023 to 2025

Other counties in North Carolina
WakeRandolphBuncombeRockingham

All of North Carolina

Get a yearly reminder to test your Iredell County well

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Questions people ask about well water in Iredell County

Is well water in Iredell County safe to drink?

Most tested wells in Iredell County came in under the limits. Of 7 health checks with enough tests, manganese came closest, at 1 of 23 wells over. Every well is different, so test yours for bacteria, nitrate and arsenic.

Where can I get my well tested in Iredell County?

Use a lab North Carolina has certified for drinking water. North Carolina's list is linked above, in the box about testing. Ask for bacteria, nitrate and arsenic, the tests that matter most in Iredell County.

How often should I test my well in Iredell County?

None of the 1 wells tested for bacteria in Iredell County had it, but the CDC still says to test for bacteria and nitrate every year, and right away after a flood, a repair, or any change in taste or smell.

By the Tested Water teamData from the USGS, EPA and Department of Health and Human ServicesUpdated November 8, 2026

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Where the Iredell County numbers come from

  • People on wells: 51,328 in Iredell County, from EPA estimates built on the 2020 Census (Murray et al.).
  • Lab tests: 344 well water samples from 26 wells in the Water Quality Portal, run by the USGS and EPA, 2002 to 2014.
  • Neighboring counties: the 9 counties that share a border with Iredell County, from the Census Bureau's county adjacency file.
  • PFAS: EPA tests of 7 town water systems in Iredell County under the Fifth Unregulated Contaminant Monitoring Rule, 2023 to 2025.
  • Radon: Iredell County is zone 2 on the EPA Map of Radon Zones.
  • State programs and links: Department of Health and Human Services, checked November 1, 2026.
Download this county's data (CSV)How we read these numbersReport an error
Test for bacteria and nitrate every yearSee lab tests