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Val Verde County WCID Comstock

What EPA’s and Texas’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.

Serves
175 people
Connections
144
Water source
Groundwater
Based in
Comstock, TX
County
Val Verde
Owner
Local government
The ZIP code it serves

78837

The short answer

1 result is above the health goal. The worst: Uranium, above the health goal. No health-based violations on file since 2016.

What handles it

What was found

Uranium, total trihalomethanes (TTHM), nitrate, haloacetic acids (HAA5), fluoride, arsenic and chromium (total): Texas’s own results, samples taken from May 6, 2020 to Sept. 3, 2025, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal1

Uranium

Comes from the source

Above the health goal

1.5ppb

Highest yearly average, 2020

Averaged by year, the highest was 1.5 ppb, in 2020: below EPA’s legal limit of 30 ppb, but above its health goal of zero. That is the only year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 1.3 ppb, in 2014.

What handles it

Below EPA’s limits4

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

18.6ppb

Highest yearly average, 2022 to 2025

2025, one sample: 8.3 ppb

Averaged by year, the highest was 18.6 ppb, in 2022, below EPA’s legal limit of 80 ppb. In 2025, the latest year on file, its one sample was 8.3 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 12.8 ppb, in 2019.

What handles it

  • NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
  • NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”

Nitrate

Comes from the source

Below EPA’s limits

1.6ppm

Highest sample; found in 5 of 5

2024, one sample: 1.4 ppm

The highest sample, in 2021, was 1.6 ppm, below EPA’s legal limit of 10 ppm. In 2024, the latest year on file, its one sample was 1.4 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 1.7 ppm, in 2014.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

5.9ppb

Highest yearly average, 2022 to 2025

2025, one sample: 1.8 ppb

Averaged by year, the highest was 5.9 ppb, in 2022, below EPA’s legal limit of 60 ppb. In 2025, the latest year on file, its one sample was 1.8 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 7.9 ppb, in 2019.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.36ppm

Highest yearly average, 2021 to 2024

2024, one sample: 0.34 ppm

Averaged by year, the highest was 0.36 ppm, in 2021, below EPA’s legal limit of 4.0 ppm. In 2024, the latest year on file, its one sample was 0.34 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.43 ppm, in 2015.

What handles it

3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Chromium (total)
  • Lead

What handles it

A certification covers specific claims, not a whole standard. Look for these claims on the certifier’s listing, not the box. Wording varies a little: NSF writes “Lead Reduction,” WQA just “Lead.”

At the tap, or for the whole house?

These come with the water itself, so a whole-house system certified for the same claims treats every tap and shower. A filter at the tap treats drinking water for much less. How whole-house systems compare.

Filters with those claims on a certifier’s listing

None of the filters TapBuff has checked so far carry these claims. Search the certifier listings for the claim above.

Compare five-year costs

Violations since 2016

No health-based violations on file with EPA since 2016. There are 4 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Uranium, total trihalomethanes (TTHM), nitrate, haloacetic acids (HAA5), fluoride, arsenic and chromium (total) results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Val Verde County WCID Comstock’s own annual report, which it must send you every year, has the contaminants this page does not show.

  • Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.

  • What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.

  • Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 didn’t sample this utility; Texas’s results run from May 6, 2020 to Sept. 3, 2025.

Testing your own tap

Val Verde County WCID Comstock’s results are for the water it sends out. What your own service line, solder and fixtures add shows up only in a test of your tap, by a lab Texas certifies.

No lab Texas certifies is within 75 miles of the area Val Verde County WCID Comstock serves on the state’s list. Some take samples by mail; the state’s page lists them all.

Texas Well Owner Network, Texas A&M AgriLife Extension: Well Informed screening events, where well owners bring in water samples to be screened for common contaminants, followed by an hour-long session explaining the results. Upcoming events are on the network's calendar. Trainings, Texas Well Owner Network.

All 80 certified labs for Texas

Sources

PWSID TX2330003. Rebuilt from EPA data on Oct. 18, 2026.

Also in Val Verde County

All Texas utilities

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