Certified well water labs in Tennessee (2026)

WellTestList · Friday, September 18, 2026 · state page

Tennessee does not require private-well sampling the way it regulates a utility. TDEC still tells owners to test for bacteria every year, about two-thirds of the state sits on limestone that can turn into karst conduits, and lenders write their own analyte lists at closing. Here is the county fee path, the certified commercial-lab PDF revised March 17, 2026, Tennessee Tech’s homeowner packages with a six-hour bacteria clock, and mail-in kits that email a PDF.

The short version

Call your county environmental health / groundwater desk first. Knox County still publishes a $50 well bacteria sample. Sevier’s 2024 fee schedule lists a water sample at $100. Blount offers bacteriological analysis on request. Ask which days they collect and whether an environmentalist comes to the house.
Use TDEC’s Laboratory Certification Program commercial-lab PDF when you need a named certified lab. Prefer commercial names, then call about residential / private-well samples, hold times, and PDF delivery. Many entries on the microbiology list are utility plant labs.
If you want a broader PDF this month without the bacteria clock, an independent mail-in kit works from Tennessee. Confirm the analyzing lab meets what a lender named before you sample for a closing.

How Tennessee’s system actually works

Private wells are the homeowner’s job. The Safe Drinking Water Act does not cover those taps. TDEC’s Well Water page says it is strongly recommended that private water supplies be tested annually for bacteria, and that coliforms are indicator organisms for disease-causing bacteria. If the well tests positive, disinfect and retest; persistent bacteria may need permanent disinfection (chlorinator or UV). The same page is blunt about real estate: the State of Tennessee does not have requirements for sampling and analysis of private water supplies. Ask the lender what parameters and which lab they named, then use that path.

CDC and EPA both frame the annual minimum as total coliform bacteria, nitrates, total dissolved solids, and pH, plus whatever is a local problem. TDEC’s Division of Water Resources Laboratory Certification Program certifies labs for chemistry, microbiology, radiochemistry, and Cryptosporidium so public-water compliance data is usable. The live hub is the Laboratory Certification Program page (questions: 615-532-0191). Two buttons at the bottom open the current certified commercial and microbiological lists. EPA’s national page still points at a PDF of state certification programs.

Karst is not a slogan here. TDEC’s groundwater 305(b) framing states that roughly two-thirds of Tennessee is limestone country that can develop sinkholes, springs, disappearing streams, and caves, with rapid conduit flow after storms. USGS sampling in Middle Tennessee’s Mississippian carbonate aquifer found nitrate frequently (median about 1.5 mg/L as nitrogen in one study network, with some sites above the 10 mg/L MCL) and fecal-indicator bacteria at a large share of sites. That is why the annual bacteria bottle matters even when the water looks fine. The same TDEC framing says western-style naturally occurring arsenic is not a statewide Tennessee geology problem — still test a specific well if a prior report, a local notice, or a lender panel asks for it.

Options we verified

Fees live on county pages, fee-schedule PDFs, and the university lab page. What we could verify with a public URL tonight:

The table scrolls sideways on a phone.

Verified September 18, 2026. Prices are what the pages listed that day. Call before you book.
Option	What they offer	Listed cost	Catch
Knox County Health — Groundwater Services	Well water sample for bacteria (E. coli and total coliform). Environmentalist samples private residences (and some public springs such as Loves Creek Spring). Advises if the sample is positive. Does not test for heavy metals.	$50.00 per sample.	Call 865-215-5200 (ext. 1) or 865-215-5555 / health@knoxcounty.org. Ask which days they collect before you flush the line. Metals, nitrate panels, and lender chemistry still need a certified commercial lab.
Sevier County Health — Environmental Health fee schedule (2024)	Fee schedule line for a water sample under Division of Environmental Health. Office listed at 227 Cedar Street, Sevierville.	$100.00 water sample.	Phone on the schedule: 865-429-1766. Confirm what analytes the $100 covers and which days they accept bottles — a fee line is not a full sampling SOP.
Blount County Environmental Health	Upon request, bacteriological analysis on private water supplies for total coliform and fecal coliform. Operates under TDEC subsurface-sewage rules for septic work; water sampling is a separate request service.	Development Service Fee Schedule lists Water Sample at $100 (document year 2020 — confirm current fee).	Phone 865-681-9301, 1221 McArthur Road, Maryville. Hours Mon–Fri 8 a.m.–4:30 p.m. Call before you treat the 2020 fee sheet as today’s price.
Tennessee Tech University Water Center Lab (Cookeville)	State-certified environmental quality lab with published homeowner packages. Bacterial analysis: total coliform and E. coli. Basic water chemistry: pH, conductivity, turbidity, coliform + E. coli, minerals (calcium, copper, iron, magnesium, manganese, potassium, sodium, zinc), hardness, and IC scan (nitrate, nitrite, chloride, fluoride, sulfate). Separate lead option. Appears on TDEC’s commercial certified list as Lab ID 02029.	Bacterial analysis $40. Basic water chemistry $125. Lead $35 plus $10 digestion fee per batch.	Drop-off Prescott Hall Room 426, Monday–Thursday 8 a.m.–3 p.m. Bacterial samples must be analyzed within six hours of collection. No Friday acceptance. Transport on ice; bacteria bottles cannot be mailed. Contact Phillip Burr, 931-372-3538.
TDEC certified commercial labs PDF (footer dated March 17, 2026)	Official Division of Water Resources list of laboratories certified for drinking-water analyses. Program hub: Laboratory Certification Program. Companion microbiological labs PDF is mostly utility / plant labs. In-state commercial-looking examples with phones printed on the March 17, 2026 commercial list: AIRL–Cleveland (423-476-7766), Assured Bio Labs–Oak Ridge (865-813-1700), Eurofins Knoxville (865-291-3000), Microbac–Maryville / Knoxville Division (865-977-1200), Microbac Nashville line (615-242-1480), Pace Analytical National–Mount Juliet (615-758-5858), Tennessee Tech Water Center (931-372-3538), Waypoint Analytical–Jackson (731-423-5330), Waypoint Analytical–Memphis (901-213-2400).	Ask for a quote. We are not inventing a statewide price book.	Certification expiration dates are printed per lab — expired certifications are not accepted for compliance work. “Certified” is not a promise of walk-up hours or private-well acceptance. Call about residential samples, bacteria hold time, Friday rules, price, and PDF delivery. LCP questions: 615-532-0191.

We looked for a single published statewide county-health fee book tonight and did not find one beyond the county pages and fee PDFs above. For Total Coliform sampling contacts by region, TDEC’s Well Water page points at the Subsurface Sewage Disposal Systems / Environmental Field Office contact list. Call your own county desk even if you are not in Knox, Sevier, or Blount — that is still the right first call after a flood, a new well, or a local contaminant notice.

What Tennessee guidance actually warrants

Match the panel to the land. TDEC’s well-water page, EPA private-well pages, and CDC testing guidance line up on the core schedule:

Every year: total coliform bacteria (TDEC’s explicit annual recommendation). Nitrate every year, and always before the water goes to an infant under six months. EPA’s nitrate MCL framing is 10 mg/L as nitrogen.
After a flood, well work, a dry-then-recovered well, or a change in taste / color / odor: bacteria first, on the hold-time clock. See our after-a-flood guide.
Karst / sinkhole / spring country: treat surface connections as real. Rapid conduit flow after storms is why bacteria after heavy rain is a reason to retest, not a surprise.
Farm / septic / livestock country (especially Middle Tennessee carbonate aquifers): keep nitrates on the annual list. USGS work in those aquifers found nitrate and fecal indicators often enough that “clear looking” is not a lab result.
Near tanks, industry, or known spills: ask about VOCs. Only a certified lab measures them.
Lead: plumbing is the usual source, not the aquifer. Flush cold water; never cook from the hot tap; only a certified lab measures it. Tennessee Tech lists a separate lead package if you already use that drop-off.
PFAS: ask whether Method 533 or 537.1 is on scope before you buy. Details: PFAS Method 533 / 537.1.

When the Certificate of Analysis arrives, more: how to read a well water report.

Hardware-store strips are screening-only. They are not an annual well test and they are not what a lender means by “tested.”

Hold times (the Friday trap)

Tennessee Tech is explicit: bacterial samples must be analyzed within six hours, accepted Monday through Thursday only, no Fridays, cooler required, no mailing the bacteria bottle. That is a tighter clock than many county 24–30 hour kits. County desks set their own collection days — ask before you sample on a Thursday afternoon. Plan around receiving hours, not around Saturday free time. More: what to test after a flood.

Mail-in kits that work from Tennessee

Independent mail-in labs ship to and from Tennessee as ordinary domestic US kits. They email a PDF. They are not selling you a softener in the same breath. For a lender or local compliance ask, confirm the analyzing lab meets what the underwriter named — TDEC’s own FAQ says the state has no private-supply sampling requirement, so the underwriter’s list wins. Listed prices we checked on September 18, 2026:

Tap Score / SimpleLab Essential Well: $209 listed (54 analytes; standard shipping and prepaid return on the product page).
National Testing Laboratories WaterCheck Basic: $220 listed plus free delivery on watercheck.com. Next-day return shipping is not included. Budget for overnight return on the bacteria bottle.

Those are listed prices, not coupons. Kits change. Read the current product page before you buy. If a county desk like Knox’s $50 bacteria path covers your question, check that path before you spend $200 on a national kit for the same core analytes.

Side by side for a Tennessee well

The table scrolls sideways on a phone.

Typical paths for a Tennessee private well in 2026. Not a bid.
	County environmental health	TDEC-listed commercial / Tech lab	Mail-in (Tap Score / NTL)
Best for	Cheap annual bacteria when your county still runs a published sample fee	Local drop-off, lender-named lab, metals / VOCs / broader chemistry when the county menu is bacteria-only; Tech’s $125 basic chemistry when Cookeville hours fit	Broader baseline panel and a PDF when county hours or the bacteria clock do not fit
PDF?	Ask the county desk how results arrive	Yes — ask for the emailed Certificate of Analysis	Yes. Email is the product
Sales visit?	No	No, if you stay with an independent lab	No
Lender / CoC?	Often not what an underwriter named. TDEC says there is no statewide private-supply sampling rule — ask the lender before you treat a county bacteria slip as the closing test	Often what the underwriter named. Confirm certification scope (microbiology vs chemistry) before you sample	Sometimes not. Ask before you sample. See home purchase / lender CoC

Real estate and lenders

TDEC’s Well Water FAQ answers the lender question twice: the state has no private-supply sampling requirement, so you ask the underwriter what parameters and which path they will accept, then use a certified lab from the Laboratory Certification Program lists for anything beyond a simple Total Coliform county path. Confirm the lab, the analyte list, certification scope, and the chain-of-custody form before you fill a bottle. A cheap county bacteria kit can be a perfectly good health file and still bounce at the bank. More: home purchase / lender chain of custody.

Remind me to test my well every year

CDC and EPA say to test a private well at least once a year. We’ll send one email a year, about when your test is due, with your state’s lab options.

Thanks, you’re on the list. We’ll email you once a year when it’s time to test your well. Nothing else.

What to do in Tennessee

Call your county environmental health / groundwater desk and ask whether they still collect private-well bacteria samples, what the fee is, and which days they accept bottles.
If you are in Knox County, plan on about $50 for bacteria (E. coli + total coliform) with an environmentalist visit. Sevier’s published water-sample fee is $100 on the 2024 schedule — confirm before you pay.
Open TDEC’s certified commercial-lab list (footer dated March 17, 2026) from the Laboratory Certification Program PDF, prefer commercial labs, then call about residential / private-well samples, hold times, and PDF delivery.
If you can reach Cookeville on a weekday morning, Tennessee Tech’s Water Center Lab publishes homeowner bacteria at $40 and basic chemistry at $125 — but the bacteria bottle has a six-hour clock and no Friday drop-off.
If you want a broader PDF this month and the bacteria clock or county hours do not fit, use Tap Score / SimpleLab or National Testing Laboratories (Watercheck).
Match the panel to the land. Bacteria every year. Nitrates every year, especially in farm / septic / karst country and before a newborn. After a flood, start with disinfection and bacteria.

Not this if…

A lender named a local lab and a chain-of-custody form. Use that lab. Do not substitute a county bacteria slip or a mail-in kit and hope. TDEC will not invent the underwriter’s list for you.
Someone offered a free in-home “test” that ends in a softener pitch. That is not on this page. See the Home Depot free-kit comparison.
You only wanted a strip from the hardware aisle. Fine as screening-only. It is not a certified analysis.
You expected every lab on the TDEC microbiology PDF to take your bottle. Many are plant or municipal labs. Start with the commercial list, then call.
You planned a Friday bacteria drop at Tennessee Tech. The lab will not take it. That is the six-hour / no-Friday rule, not rudeness.
You expected a full statewide lab phone book with hours and “yes we take homeowners.” We refused to invent one. The certification list plus a phone call is the honest path until we verify individual walk-up hours.