Well water in Comanche County, Texas
In Comanche County, 15% of 85 tested well samples exceeded the EPA limit for nitrate (10 mg/L), based on public data from Texas Water Development Board Groundwater Database.
158 individual samples from 82 wells, 1937 to 2023. 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 Comanche 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 | |
|---|---|---|---|---|---|---|---|
| Nitrate 1990 to 2023 | 85 | 86% | 15% | 1.86 | 61 | 10 mg/L EPA limit | |
| Fluoride 1959 to 2023 | 154 | 99% | 0% | 0.42 | 2.1 | 4 mg/L EPA limit | |
| Arsenic 1990 to 2023 | 85 | 1% | 0% | 0 | 1.8 | 10 ug/L EPA limit | |
| Lead 1990 to 2023 | 85 | 9% | 0% | 0 | 6 | 15 ug/L EPA limit | |
| Copper 1990 to 2023 | 85 | 62% | 0% | 0.002 | 0.038 | 1.3 mg/L EPA limit | |
| Radium (226 + 228) 1990 to 2011 | 32 | 84% | 0% | 1.1 | 3.2 | 5 pCi/L EPA limit | |
| Gross alpha 1990 to 2011 | 29 | 52% | 0% | 3.2 | 12.1 | 15 pCi/L EPA limit | |
| Uranium 2011 to 2023 | 28 | 75% | 0% | 2.85 | 5.5 | 30 ug/L EPA limit | |
| Chloride 1937 to 2023 | 158 | 100% | no limit | 57.9 | 1,201 | 250 mg/L nuisance level | |
| Sodium 1959 to 2023 | 156 | 100% | no limit | 52.8 | 484 | 20 mg/L health guideline | |
| Iron 1960 to 2023 | 95 | 40% | no limit | 0 | 4,900 | 300 ug/L nuisance level | |
| Manganese 1961 to 2023 | 86 | 58% | no limit | 3.03 | 77.5 | 300 ug/L health guideline |
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What this means
The contaminants most often above their limit here are nitrate (15% of 85 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 Manganese 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 Comanche County
- Volatile organic compounds (VOCs)25 leaking underground storage tank sites on record locally.
- Nitrate15% of 85 local samples were above the limit.
- Coliform bacteriaRecommended for every private well, every year.
- ChlorideDetected in 100% of local samples.
- FluorideDetected in 99% of local samples.
- CopperDetected in 62% of local samples.
- ManganeseDetected in 58% of local samples.
Contamination sources on record in Comanche County
TCEQ records 25 leaking underground storage tank sites in Comanche County, among 33 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.
- 25
- leaking underground storage tank sitesGasoline and heating oil that leaked from tanks move through groundwater as benzene, MTBE and other volatile organic compounds.
- 8
- lined landfills and transfer facilities
Treatment that fits the local profile
- Nitrate
- Point-of-use reverse osmosis; Anion exchange; Distillation
- 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
- Manganese
- Oxidizing filter (greensand, birm) whole-house; Water softener (low levels); Point-of-use reverse osmosis
Get your Comanche 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 Comanche County.
Common questions
Is there arsenic in well water in Comanche County?
Arsenic was detected in 1% of 85 public well samples in Comanche 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 Comanche 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: 1,078 samples in Comanche County. Water quality samples from the Texas Water Development Board Groundwater Database, collected by TWDB, groundwater conservation districts and cooperators. Retrieved September 9, 2026.
- TCEQ regulated sites: 33 regulated sites located in Comanche 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.