About 0% of the county's 1,982,498 residents. Rank 75 of 254 in Texas.
95% range 117 to 229 private-well users (2010 base year). Rank 80 of 254 in Texas.
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 Tarrant 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:
- The Texas Well Owner Network (Texas A&M AgriLife Extension) recommends testing well water every year, at least for E. coli, even if the water looks and tastes fine. source
Arsenic. USGS estimates that about 164 people using private wells in Tarrant County had arsenic above 10 µg/L, EPA's limit for public water (2010 base year; 95% range 117 to 229). 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 Tarrant 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 |
|---|---|---|
| Lubbock County | 11,642 people (2010 base year) | |
| Midland County | 7,306 people (2010 base year) | |
| Harris County | 6,396 people (2010 base year) | |
| Ector County | 5,449 people (2010 base year) | |
| Montgomery County | 3,720 people (2010 base year) | |
| Tarrant County (this county) | 164 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 Tarrant 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. 31 public systems that serve ZIP codes mainly in Tarrant County reported results. 12 of them had at least one sample with PFOA or PFOS at or above 4.0 ng/L, and 26 had at least one of the 29 PFAS measured at or above its reporting level.
| Public water system | System ID | Highest PFOA (ng/L) | Highest PFOS (ng/L) |
|---|---|---|---|
| City Of Grand Prairie | TX0570048 | 4.9 | 82 |
| City Of Fort Worth | TX2200012 | 8.3 | 7.3 |
| City Of Haltom City | TX2200014 | 5.6 | 7.7 |
| City Of Keller | TX2200096 | 5.7 | |
| City Of Grapevine | TX2200013 | 5.5 | 5 |
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 Texas
- The Texas Well Owner Network holds well water screening events, such as its June 2026 events in South Texas. Samples are screened for total coliform bacteria, E. coli, nitrate-nitrogen, arsenic and salinity, followed by a results meeting. At the June 2026 South Texas events the fee was $15 per sample in some areas (Robstown, Sinton and Refugio) and free in others, so check each event. source
- The Texas Water Development Board says some groundwater conservation districts test well water for free or at a reduced cost. Its GCD Index shows whether your address is in a district. source
- The Texas Water Development Board's groundwater monitoring program occasionally has funds to sample private wells case by case. It tests naturally occurring constituents only, not bacteria. source
Buying a home with a well in Tarrant County
Loan test (FHA, VA, USDA) in Tarrant County, TX
- 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 Tarrant County
City of Arlington Water Utilities Laboratory Services
6920 Russell Curry Road, Arlington, TXPublic samples: ask the labFort Worth Water Department Centralized Water & Wastewater Laboratory
2600 SE Loop 820, Fort Worth, TXPublic samples: ask the labTarrant County Public Health Laboratory
1101 South Main Street, Suite 1700, Fort Worth, TXHomeowner samples: yes (lab’s website)Labs on the Texas list whose own websites say they take homeowner samples: Angelina and Neches River Authority Environmental Laboratory (Lufkin), City of Houston Health Department, Bureau of Laboratory Services (Houston), Edwards Aquifer Research and Data Center (San Marcos), Guadalupe-Blanco River Authority Regional Laboratory (Seguin), Integrity Testing, Inc. (Austin), Lower Colorado River Authority - Environmental Laboratory Services (Austin), SPL, Inc – Kilgore (Kilgore), SPL, Inc. – Plano (Plano) and 4 more. Use Check my ZIP to sort labs by distance.
See all Texas 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)
- TCEQ Laboratory Approval Status - List of Accredited Laboratories (public database, Matrix: Drinking Water) (Live database, searched 2026-11-15 ("accurate as of the date and time of the search"))
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