Well water in Roberts County, Texas
In Roberts County, <1% of 116 tested well samples exceeded the EPA limit for fluoride (4 mg/L), based on public data from Texas Water Development Board Groundwater Database and USGS Water Quality Portal.
116 individual samples from 31 wells, 1975 to 2024. 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 Roberts 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 | |
|---|---|---|---|---|---|---|---|
| Fluoride 1975 to 2024 | 116 | 100% | <1% | 0.98 | 4.9 | 4 mg/L EPA limit | |
| Copper 2003 to 2024 | 27 | 52% | 0% | 0.001 | 0.005 | 1.3 mg/L EPA limit | |
| Arsenic 2003 to 2024 | 26 | 50% | 0% | 0.82 | 2.76 | 10 ug/L EPA limit | |
| Nitrate 2003 to 2024 | 26 | 100% | 0% | 1.29 | 6.19 | 10 mg/L EPA limit | |
| Lead 2003 to 2024 | 26 | 4% | 0% | 0 | 1.3 | 15 ug/L EPA limit | |
| Radium (226 + 228) 2008 to 2016 | 24 | 21% | 0% | 0 | 1.22 | 5 pCi/L EPA limit | |
| Uranium 1999 to 2024 | 17 | 100% | 0% | 4.75 | 8.17 | 30 ug/L EPA limit | |
| Gross alpha 2008 to 2016 | 11 | 91% | 0% | 5.26 | 11.4 | 15 pCi/L EPA limit | |
| Chloride 1975 to 2024 | 116 | 100% | no limit | 16.9 | 167 | 250 mg/L nuisance level | |
| Sodium 1975 to 2024 | 28 | 100% | no limit | 19.7 | 94.2 | 20 mg/L health guideline | |
| Manganese 2003 to 2024 | 26 | 50% | no limit | 0.201 | 24.8 | 300 ug/L health guideline | |
| Iron 2003 to 2024 | 26 | 23% | no limit | 0 | 145 | 300 ug/L nuisance level |
Sampled fewer than 10 times, too few to summarize: E. coli (1), Radon (2).
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What this means
The contaminants most often above their limit here are fluoride (<1% of 116 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 is widespread in local groundwater. It is mainly a staining and taste problem, but high manganese also carries a health advisory for infants.
What to test for in Roberts County
- Volatile organic compounds (VOCs)6 leaking underground storage tank sites on record locally.
- Fluoride<1% of 116 local samples were above the limit.
- Coliform bacteriaRecommended for every private well, every year.
- RadonMedian local reading is 183 pCi/L.
- ChlorideDetected in 100% of local samples.
- NitrateRecommended for every private well, especially near farms or septic systems.
- CopperDetected in 52% of local samples.
Contamination sources on record in Roberts County
TCEQ records 6 leaking underground storage tank sites in Roberts County, among 7 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.
- 6
- leaking underground storage tank sitesGasoline and heating oil that leaked from tanks move through groundwater as benzene, MTBE and other volatile organic compounds.
- 1
- lined landfill or transfer facility
Treatment that fits the local profile
- Fluoride
- Point-of-use reverse osmosis; Activated alumina; Distillation
- Copper
- Neutralizing filter to raise pH; Point-of-use reverse osmosis
- Chloride
- Point-of-use reverse osmosis; Distillation
Get your Roberts County water tested at home
A licensed local water treatment company tests your tap water in your home, walks you through the numbers, and quotes treatment only if something needs fixing. Free, about 30 minutes, no obligation. Tell us what you need and we match you with a company that serves Roberts County.
Common questions
Is there arsenic in well water in Roberts County?
Arsenic was detected in 50% of 26 public well samples in Roberts 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 Roberts County?
The median radon level across 2 public samples in Roberts County was 183 pCi/L, with a high of 240 pCi/L. New Hampshire recommends treatment above 2,000 pCi/L.
How often should I test a private well in Roberts 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: 464 samples in Roberts 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: 8 samples in Roberts 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: 7 regulated sites located in Roberts 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.