Certified well water labs in Texas (2026)

WellTestList · Saturday, August 29, 2026 · state page #3

Texas does not regulate the water quality of private wells. Here is how to use TCEQ’s accredited-lab search, which local options we could verify tonight, what Texas geology and land use actually warrant, and mail-in kits that email a PDF.

The short version

1. Call DSHS or a county lab for cheap bacteria, then check Extension and your groundwater district. The state public-health lab in Austin still takes a homeowner coliform bottle. Tarrant County’s regional lab does the same. AgriLife’s Texas Well Owner Network runs cheap county screenings when a date is on the calendar — not a walk-up desk.
2. Use TCEQ’s accredited-lab search for a local drop-off. Filter Drinking Water, pick your analyte, prefer commercial if you want a private lab, then call. Accreditation does not mean they take a homeowner bottle.
3. If you want a PDF this month without driving, an independent mail-in kit works from Texas. Ask the lender before you sample if a bank is involved.

How to use TCEQ’s certified-lab list

The Texas Commission on Environmental Quality runs the state’s Environmental Laboratory (NELAP) Accreditation program. Labs that submit drinking-water data for commission decisions must be accredited under the TNI standard. That is the official list. It is written for compliance labs, not as a consumer directory.

TCEQ publishes two public search tools. Start with TCEQ’s own database: TCEQ Laboratory Approval Status. That is the search described on the accreditation page.

• Matrix: Drinking Water
• Analyte: what you need (coli for coliform / E. coli, arsenic, nitrate, and so on). Partial matches work. A lab can be accredited for bacteria and not for arsenic.
• Commercial?: Yes, if you want a private lab rather than a utility or agency lab
• Search, then filter by city. Open a lab name for the current certificate and scope.

TCEQ’s walkthrough also points at the national TNI search: Search TNI LAMS. Same idea: Accreditation Body = Texas Commission on Environmental Quality, Is Active = Yes, Matrix = drinking water, then analyte and city.

Then call. Ask whether they accept a residential / private-well sample, what bottles they issue, the bacteria hold time, Friday rules, price, and whether they email a PDF. We are not going to invent a roster of drop-off labs we did not confirm take homeowners.

For geography, TCEQ also keeps a map of NELAP drinking-water public laboratories and a PWS Laboratory Map Table (table updated March 26, 2026). Match the number on the map to the table. The table is built for public-water-system compliance (microbial, lead and copper, water-quality parameters). TCEQ’s own note: always call to confirm address, drop-off hours, and prices. You may also call TCEQ at 512-239-3754 and ask for the accredited-lab list — that number is on TCEQ’s private-well sampling guide (GI-433).

EPA’s national page still points at a PDF of state certification programs (page updated August 11, 2026). For Texas, use TCEQ’s search above.

TCEQ’s private-well page is short and clear: you are responsible for testing, and TCEQ recommends an accredited drinking-water laboratory. The Texas Water Development Board says the same thing and points at that TCEQ map. TWDB is not a regulatory agency and does not run your annual bacteria bottle.

County, state-lab, and Extension options we verified

Texas does not run an Iowa-style statewide private-well testing grant through every county. Private wells are unregulated. Testing is on you. What we could verify with a public URL tonight:

The table scrolls sideways on a phone.

We looked for published homeowner kit-and-price pages in Harris / City of Houston Health, Travis County (apart from LCRA), Bexar, Dallas, and El Paso. Houston Health has older private-well bacteria flyers (including a $16.50 figure on 2016 material) and a 832-393-3939 lab number; we could not treat that fee as current tonight, so it is not in the table. If your county or district runs a program we missed, use it. Call environmental health anyway.

What Texas geology and land use actually warrant

The Texas Well Owner Network’s Well Owner’s Guide to Water Supply is the practical statewide briefing. Private wells are unregulated. The owner is the utility. Annual bacteria is the floor. Then add tests that match the aquifer and the land:

• Bacteria after floods, repairs, or a pressure loss. TCEQ’s After the Flood page and GI-432 are blunt: if the well was inundated, do not drink from it until floodwater is gone, you have disinfected, and an accredited lab reports total coliform absent. GI-433 is the sampling walkthrough. TWON ran free Hill Country post-flood screenings in mid-August 2026 after the July rains; those dates are over. Use an accredited bottle now.
• Nitrate near farms, septic, or livestock. Infants are the reason this is not optional. Some Texas aquifers — the Seymour and Lipan are the ones TWDB-supported work has long flagged — show widespread nitrate-N above the drinking-water MCL in ambient samples. No taste you can trust.
• Arsenic occurs naturally in Texas rock and sediment. TWON’s guide names the Ogallala of the High Plains, the Gulf Coastal Plains, and the Basin and Range as places where concentrations above 20 µg/L have been found. The EPA MCL is 10 µg/L (10 ppb). No taste, smell, or color. Test through a TCEQ-accredited drinking-water lab. The Bureau of Economic Geology’s 2025 minor-aquifer arsenic update is the recent technical paper if you want the maps.
• Fluoride, radionuclides, and uranium are the other naturally occurring contaminants TWON says most often exceed primary standards in Texas groundwater. Worth a once-through panel in many aquifers, not a guess from the tap.
• Oil or gas activity nearby: chloride (and the rest of a common anion suite) is the honest first add-on. LCRA lists hydraulic-fracturing concern as a reason people order a residential kit. TWDB’s older well-testing note points at total petroleum hydrocarbons for a pre-drill baseline. If the result has to hold up later, use a lab that will do chain-of-custody. We are not going to invent a barium-and-BTEX roster we did not confirm as the Texas standard panel.

TWDB’s Water Quality by County reports are ambient samples from the state’s major and minor aquifers, not your well. Useful for what to ask for. Not a substitute for a bottle from your tap.

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)

Bacteria is on a short clock. DSHS requires the sample be tested within 30 hours of collection and will not accept Friday, weekend, or holiday drop-off. LCRA accepts bacteria Monday through Thursday only and tells you to collect the same day you deliver or ship, on ice. Tarrant’s fee page still sells Friday service — for an extra $15 — which is the exception that proves the rule. Most labs will not take a Friday bacteria bottle. Plan the collection day around the lab’s receiving hours, not around your Saturday free time.

Metals and nitrate are more patient. Bacteria is not. A voided sample is the clock, not a conspiracy.

Mail-in kits that work from Texas

Independent mail-in labs ship to and from Texas as ordinary domestic US kits. They email a PDF. They are not selling you a softener in the same breath. Listed prices we checked on August 29, 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 on watercheck.com (36 analytes). 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. PFAS is usually a separate kit.

Side by side for a Texas well

The table scrolls sideways on a phone.

Real estate and lenders

Texas does not regulate private-well water quality, so there is no single statewide “must test these analytes at sale” rule we can quote. Practice is lender- and county-driven. TWDB keeps a separate note on VA-loan well testing. Confirm the lab, the analyte list, and the form with the underwriter before you fill a bottle. A mail-in kit can be a perfectly good health file and still bounce at the bank. A TWON screening is not the CoC path.

Related: Florida · North Carolina · certified labs in Minnesota · Pennsylvania · Home Depot free kit vs a certified lab · Tap Score vs NTL vs county costs · How it works · back to the directory.