Well water in Jeff Davis County, Texas
In Jeff Davis County, none of 32 tested well samples exceeded the EPA limit for fluoride, based on public data from Texas Water Development Board Groundwater Database and USGS Water Quality Portal.
32 individual samples from 23 wells, 1969 to 2010. 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 Jeff Davis 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 1969 to 2008 | 32 | 100% | 0% | 0.8 | 3.7 | 4 mg/L EPA limit | |
| Arsenic 1990 to 2003 | 14 | 50% | 0% | 0.65 | 8.2 | 10 ug/L EPA limit | |
| Nitrate 1990 to 2003 | 14 | 100% | 0% | 0.815 | 1.62 | 10 mg/L EPA limit | |
| Lead 1990 to 2003 | 14 | 0% | 0% | 0 | 0 | 15 ug/L EPA limit | |
| Copper 1990 to 2003 | 14 | 29% | 0% | 0 | 0.007 | 1.3 mg/L EPA limit | |
| Sodium 1969 to 2008 | 32 | 100% | no limit | 23 | 413 | 20 mg/L health guideline | |
| Chloride 1969 to 2008 | 32 | 100% | no limit | 9.85 | 580 | 250 mg/L nuisance level | |
| Manganese 1990 to 2003 | 14 | 7% | no limit | 0 | 6.9 | 300 ug/L health guideline | |
| Iron 1990 to 2003 | 14 | 36% | no limit | 0 | 322 | 300 ug/L nuisance level |
Sampled fewer than 10 times, too few to summarize: Gross alpha (8), Uranium (3).
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What this means
Among contaminants with a federal limit, no tested sample in Jeff Davis County came back above it. That is reassuring, but sampling is uneven: wells that were never tested are not in this data.
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 Jeff Davis County
- Volatile organic compounds (VOCs)8 leaking underground storage tank sites on record locally.
- Coliform bacteriaRecommended for every private well, every year.
- Gross alphaAbove the limit in 1 of 8 local samples; too few to quote a rate.
- FluorideDetected in 100% of local samples.
- ChlorideDetected in 100% of local samples.
- NitrateRecommended for every private well, especially near farms or septic systems.
Contamination sources on record in Jeff Davis County
TCEQ records 8 leaking underground storage tank sites in Jeff Davis County, among 11 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.
- 8
- leaking underground storage tank sitesGasoline and heating oil that leaked from tanks move through groundwater as benzene, MTBE and other volatile organic compounds.
- 3
- lined landfills and transfer facilities
Treatment that fits the local profile
- Fluoride
- Point-of-use reverse osmosis; Activated alumina; Distillation
- Chloride
- Point-of-use reverse osmosis; Distillation
Get your Jeff Davis 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 Jeff Davis County.
Common questions
Is there arsenic in well water in Jeff Davis County?
Arsenic was detected in 50% of 14 public well samples in Jeff Davis 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 often should I test a private well in Jeff Davis 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: 188 samples in Jeff Davis 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: 3 samples in Jeff Davis 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: 11 regulated sites located in Jeff Davis 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.