Well water in Waller County, Texas
In Waller County, sodium was detected in 100% of 31 tested well samples from Texas Water Development Board Groundwater Database and USGS Water Quality Portal.
31 individual samples from 23 wells, 1947 to 2025. 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 Waller 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 1949 to 2025 | 28 | 100% | 0% | 0.245 | 1.7 | 4 mg/L EPA limit | |
| Nitrate 1947 to 2025 | 16 | 63% | 0% | 0.17 | 0.5 | 10 mg/L EPA limit | |
| Arsenic 1992 to 2025 | 14 | 29% | 0% | 0 | 2.51 | 10 ug/L EPA limit | |
| Lead 1992 to 2025 | 14 | 0% | 0% | 0 | 0 | 15 ug/L EPA limit | |
| Copper 1992 to 2025 | 14 | 50% | 0% | 0.001 | 0.032 | 1.3 mg/L EPA limit | |
| Radium (226 + 228) 2002 to 2014 | 10 | 30% | 0% | 0 | 0.28 | 5 pCi/L EPA limit | |
| Sodium 1948 to 2025 | 31 | 100% | no limit | 44 | 134 | 20 mg/L health guideline | |
| Chloride 1948 to 2025 | 31 | 100% | no limit | 51.9 | 168 | 250 mg/L nuisance level | |
| Iron 1964 to 2025 | 26 | 42% | no limit | 0 | 4,000 | 300 ug/L nuisance level | |
| Manganese 1971 to 2025 | 15 | 40% | no limit | 0 | 71.8 | 300 ug/L health guideline |
Sampled fewer than 10 times, too few to summarize: Gross alpha (9), Uranium (9), E. coli (2), PFOA (1), PFOS (1), Radon (2).
Get the free Waller County well report
One email with the numbers above, what they mean for a home in Waller County, exactly which tests to order, and what treatment fits the local profile. No spam, unsubscribe in one click.
What this means
Among contaminants with a federal limit, no tested sample in Waller 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 Waller County
- Volatile organic compounds (VOCs)56 leaking underground storage tank sites on record locally.
- Metals panel1 hazardous waste site on record locally.
- Coliform bacteriaRecommended for every private well, every year.
- RadonMedian local reading is 134 pCi/L.
- 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 Waller County
TCEQ records 56 leaking underground storage tank sites and 1 hazardous waste site in Waller County, among 73 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.
- 56
- leaking underground storage tank sitesGasoline and heating oil that leaked from tanks move through groundwater as benzene, MTBE and other volatile organic compounds.
- 1
- hazardous waste siteSolvents, degreasers and metals from industrial sites can travel far in fractured bedrock.
- 16
- 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 Waller 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 Waller County.
Common questions
Is there arsenic in well water in Waller County?
Arsenic was detected in 29% of 14 public well samples in Waller 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 Waller County?
The median radon level across 2 public samples in Waller County was 134 pCi/L, with a high of 170 pCi/L. New Hampshire recommends treatment above 2,000 pCi/L.
How often should I test a private well in Waller 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: 207 samples in Waller 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: 16 samples in Waller 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: 73 regulated sites located in Waller 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.