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Gaston WSC

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
1,917 people
Connections
639
Water source
Groundwater
Based in
Joinerville, TX
County
Rusk
Owner
Local government
The 3 ZIP codes it serves

75652, 75654, 75658

The short answer

Nothing in EPA’s and Texas’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. No health-based violations on file since 2016.

What was found

Total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, chromium (total), nitrate, arsenic and uranium: Texas’s own results, samples taken from Aug. 31, 2020 to June 25, 2026, with EPA’s 2012 to 2019 file for earlier years.

Below EPA’s limits5

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

34.7ppb

Highest yearly average, 2020 to 2026

2026, one sample: 29 ppb

Averaged by year, the highest was 34.7 ppb, in 2025, below EPA’s legal limit of 80 ppb. In 2026, the latest year on file, its one sample was 29 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 29.2 ppb, in 2013.

What handles it

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

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

22.4ppb

Highest yearly average, 2020 to 2026

2026, one sample: 18.5 ppb

Averaged by year, the highest was 22.4 ppb, in 2025, below EPA’s legal limit of 60 ppb. In 2026, the latest year on file, its one sample was 18.5 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 19.8 ppb, in 2017.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.27ppm

Highest yearly average, 2021 to 2024

2024 average: 0.25 ppm

Averaged by year, the highest was 0.27 ppm, in 2021, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.43 ppm. In 2024, the latest year on file, its two samples averaged 0.25 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.32 ppm, in 2012.

What handles it

Chromium (total)

Comes from the source

Below EPA’s limits

3.1ppb

Highest yearly average, 2021 to 2024

2024: not found

Averaged by year, the highest was 3.1 ppb, in 2021, below EPA’s legal limit of 100 ppb. Its highest single sample was 4.1 ppb. In 2024, the latest year on file, it wasn’t found in any of its two samples. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.47 ppb, in 2015.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

0.033ppm

Highest sample; found in 12 of 14

2026 average: 0.011 ppm

The highest sample, in 2023, was 0.033 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its two samples averaged 0.011 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.029 ppm, in 2017.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Lead
  • Uranium

Violations since 2016

No health-based violations on file with EPA since 2016. There is 1 monitoring or reporting violation: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, chromium (total), nitrate, arsenic and uranium results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Gaston WSC’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 Aug. 31, 2020 to June 25, 2026.

Testing your own tap

Gaston WSC’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.

The 3 labs Texas certifies closest to the area Gaston WSC serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Southern Petroleum Laboratories (SPL), Inc. (FKA Ana-Lab Corporation)

    Kilgore, TX · about 16 miles

    Certified for bacteria, lead and copper

    (903) 984-0551

  • Environmental Monitoring Lab

    Winona, TX · about 29 miles

    Certified for bacteria

    (903) 877-9222

  • Analytical Environmental Labs

    Tyler, TX · about 32 miles

    Certified for bacteria

    (903) 509-8700

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 TX2010015. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Rusk County

All Texas utilities

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