About 49% of the county's 14,811 residents. Rank 29 of 95 in Tennessee.
95% range 16 to 57 private-well users (2010 base year). Rank 39 of 95 in Tennessee.
Low potential (average indoor radon may be less than 2 pCi/L). EPA says the map should not be used to decide whether an individual home needs testing.
Labs with an address in this county, from the official state lists on this site, matched by ZIP code.
What to test for in Sequatchie County
Private wells are not regulated like public water: EPA advises owners to test their well every year for total coliform bacteria, nitrates, total dissolved solids and pH. Your state's own schedule:
- TDEC's Division of Water Resources strongly recommends testing private water supplies for bacteria every year. If the well tests positive, disinfect it and retest. source
- The Tennessee Department of Health suggests bacteria every year (multiple samples), chemicals such as nitrate and metals every two years, VOCs every few years if you are near industry, and radon if your home has elevated indoor radon. source
Arsenic. USGS estimates that about 30 people using private wells in Sequatchie County had arsenic above 10 µg/L, EPA's limit for public water (2010 base year; 95% range 16 to 57). USGS describes this kind of estimate as useful "for broad screening of the population at risk", so it says nothing certain about any one well. Arsenic has no taste or smell: test for it by name.
Radon. EPA puts Sequatchie County in Zone 3: low potential (average indoor radon may be less than 2 pCi/L). That map is about radon in indoor air, and EPA says it should not be used to decide whether an individual home needs testing. If radon is found in your air and you have a well, EPA suggests testing the water too: see radon in well water.
For anything specific to your home (farms nearby, old plumbing, a new baby, a smell or stain), use the which-tests checklist. When the results arrive, check your numbers against EPA's limits.
Show the numbers
| Item | Value | Note |
|---|---|---|
| Hawkins County | 766 people (2010 base year) | |
| Sevier County | 401 people (2010 base year) | |
| Fayette County | 361 people (2010 base year) | |
| Grainger County | 312 people (2010 base year) | |
| Henry County | 225 people (2010 base year) | |
| Sequatchie County (this county) | 30 people (2010 base year) |
USGS model estimate for broad screening, not a measurement of any well. Only a test tells you about your own well. Source: USGS, Estimated county level domestic well population with arsenic greater than 10 micrograms per liter (Ayotte, Medalie and Qi, 2017), accessed 2026-11-01.
PFAS in public water near Sequatchie County (public supply, not your well)
This is public water data, not your well. A private well draws its own groundwater, which can have more or less PFAS than the public supply nearby. Only a test of your well tells you.
Under EPA’s fifth Unregulated Contaminant Monitoring Rule (UCMR 5), public water systems sampled their water for 29 PFAS between Jan 3, 2023 and Jun 17, 2026. 3 public systems that serve ZIP codes mainly in Sequatchie County reported results. 0 of them had at least one sample with PFOA or PFOS at or above 4.0 ng/L, and 0 had at least one of the 29 PFAS measured at or above its reporting level.
4.0 ng/L (parts per trillion) is both EPA’s UCMR 5 reporting level for PFOA and PFOS and the number in EPA’s 2024 limit for public water. That limit is judged on a running annual average, so one sample at that level is not a violation. EPA proposed changes to its PFAS rules in May 2026: see PFAS in well water for the current status and who should test a well. To test your own well, find a lab certified for PFAS.
Method: a system counts for this county when it reports serving a ZIP code whose largest land part is in this county, so a system serving several counties counts in each. Source: U.S. EPA, UCMR 5 occurrence data (by state), file dated Oct 15, 2026; downloaded Nov 1, 2026.
Testing programs and help in Tennessee
- For questions about total coliform sampling, TDEC directs you to the Environmental Field Office or contract county for your location. TDEC has no funding or financing program for private wells, but links to outside financing programs. source
- The Department of Health advises reviewing your results with TDEC's Division of Water Resources; a treatment system may be needed depending on the results. source
Buying a home with a well in Sequatchie County
Loan test (FHA, VA, USDA) in Sequatchie County, TN
- VA. Test results are valid for 90 days from the date the local health authority certifies them, unless the local authority says otherwise. VA’s chapter names no list of contaminants: the water must meet the local health authority’s requirements, or EPA guidelines where it has none. Your lender may ask for specific tests.
- FHA. A well test is required in the situations FHA’s handbook lists, among others, and the report may not be more than 180 days old at disbursement.
- USDA. Guaranteed loans need a water quality test for a private well, done by the local health authority or a state-certified lab, and no more than 180 days old at closing.
Lenders can ask for more (extra tests, a particular lab, who takes the sample): ask your lender before you book. Federal rules as read on Nov 3, 2026 source 1 source 2 source 3. Full comparison: VA, FHA and USDA well water test requirements. Loan test kits sold by mail, with price and days to results: kits compared.
State-certified labs in Sequatchie County
Labs on the Tennessee list whose own websites say they take homeowner samples: Tennessee Tech University Water Center (Cookeville). Use Check my ZIP to sort labs by distance.
See all Tennessee labs in the finder and filter by the test you need and by labs that take homeowner samples.
- USGS, Estimated use of water in the United States, county-level data for 2015 (Dieter et al., ver. 2.0, 2018)
- USGS, Estimated county level domestic well population with arsenic greater than 10 micrograms per liter (Ayotte, Medalie and Qi, 2017)
- U.S. EPA, Map of Radon Zones, county list (EPA 402/A-16/001)
- U.S. Census Bureau, 2020 ZCTA to county relationship file (lab ZIP codes to counties)
- TDEC Division of Water Resources - Commercial Laboratories Certified for Drinking Water Analysis + TDEC Division of Water Resources - Microbiological Laboratories Certified for Drinking Water Analyses (10/2/2026 (page footers 10/06/2026); As of October 2, 2026 (PDF title; page footers 10/06/2026))
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