Well water in Tarrant County, Texas
In Tarrant County, 1% of 69 tested well samples exceeded the EPA limit for uranium (30 ug/L), based on public data from Texas Water Development Board Groundwater Database and USGS Water Quality Portal.
69 individual samples from 65 wells, 1950 to 2016. Data refreshed September 9, 2026.
TWDB samples an ambient monitoring network of wells on a rotation, so these describe aquifers, not a survey of homeowners' tests.
What individual samples found
Each row summarizes every public sample for that contaminant inside Tarrant County. Above limit means above the EPA maximum contaminant level; where EPA has no enforceable limit, the row shows a health guideline or nuisance level instead.
| Contaminant | Samples | Detected | Above limit | Median | Highest | Limit | |
|---|---|---|---|---|---|---|---|
| Uranium 1993 to 2016 | 69 | 62% | 1% | 2 | 35 | 30 ug/L EPA limit | |
| Fluoride 1953 to 1999 | 38 | 100% | 0% | 0.4 | 1.3 | 4 mg/L EPA limit | |
| Sodium 1950 to 1999 | 47 | 100% | no limit | 182 | 459 | 20 mg/L health guideline | |
| Chloride 1950 to 1999 | 47 | 100% | no limit | 15 | 284 | 250 mg/L nuisance level |
Sampled fewer than 10 times, too few to summarize: Nitrate (5), Lead (6), Copper (6), Arsenic (5), Radium (226 + 228) (2), Gross alpha (1), E. coli (1), Iron (9), Manganese (4), Radon (1).
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What this means
The contaminants most often above their limit here are uranium (1% of 69 samples). A well next door can differ sharply from yours because bedrock fractures, well depth and plumbing all matter, so these rates describe the area, not your tap.
Chloride and Iron are widespread in local groundwater. They are mainly a staining and taste problem, but high manganese also carries a health advisory for infants.
What to test for in Tarrant County
- Volatile organic compounds (VOCs)1,895 leaking underground storage tank sites on record locally.
- Metals panel5 hazardous waste sites on record locally.
- Uranium1% of 69 local samples were above the limit.
- Coliform bacteriaRecommended for every private well, every year.
- RadonMedian local reading is 224 pCi/L.
- NitrateAbove the limit in 1 of 5 local samples; too few to quote a rate.
- FluorideDetected in 100% of local samples.
- ChlorideDetected in 100% of local samples.
- IronDetected in 89% of local samples.
Contamination sources on record in Tarrant County
TCEQ records 1,895 leaking underground storage tank sites and 5 hazardous waste sites in Tarrant County, among 1,963 regulated sites in total. Groundwater does not follow property lines, so a well within a few hundred feet of one of these is worth testing for what that site could release.
- 1,895
- leaking underground storage tank sitesGasoline and heating oil that leaked from tanks move through groundwater as benzene, MTBE and other volatile organic compounds.
- 5
- hazardous waste sitesSolvents, degreasers and metals from industrial sites can travel far in fractured bedrock.
- 63
- lined landfills and transfer facilities
Treatment that fits the local profile
- Uranium
- Point-of-use reverse osmosis; Anion exchange; Whole-house anion exchange
- Fluoride
- Point-of-use reverse osmosis; Activated alumina; Distillation
- Chloride
- Point-of-use reverse osmosis; Distillation
- Iron
- Oxidizing filter whole-house; Water softener (low levels); Aeration plus filtration
Get your Tarrant County water tested at home
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Common questions
Is there arsenic in well water in Tarrant County?
Arsenic was detected in 20% of 5 public well samples in Tarrant County, and 0% were above the EPA limit of 10 ug/L. Arsenic has no taste or smell; a lab test is the only way to know your level.
How high is radon in well water in Tarrant County?
The median radon level across 1 public samples in Tarrant County was 224 pCi/L, with a high of 224 pCi/L. New Hampshire recommends treatment above 2,000 pCi/L.
How often should I test a private well in Tarrant County?
Test for bacteria and nitrate every year. Test once for arsenic, uranium, radon, fluoride, manganese and PFAS, then again every three to five years or after any change in taste, color, or plumbing.
Sources
- Texas Water Development Board Groundwater Database: 155 samples in Tarrant County. Water quality samples from the Texas Water Development Board Groundwater Database, collected by TWDB, groundwater conservation districts and cooperators. Retrieved September 9, 2026.
- USGS Water Quality Portal: 86 samples in Tarrant County. Data from the Water Quality Portal, a service of USGS, EPA and USDA; groundwater samples collected by USGS and cooperators. Retrieved September 3, 2026.
- TCEQ regulated sites: 1,963 regulated sites located in Tarrant County. Leaking petroleum storage tank sites, state Superfund sites and municipal solid waste landfills from the Texas Commission on Environmental Quality. Retrieved September 9, 2026.
Non-detects count as samples and are treated as zero when computing medians. Exactly at the limit counts as not above it. A sample belongs to the town containing the well's reported coordinates.