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Tom Green County FWSD 3

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
1,002 people
Connections
334
Water source
Groundwater
Based in
San Angelo, TX
County
Tom Green
Owner
Local government
The ZIP code it serves

76904

The short answer

2 results are above the health goal. The worst: Arsenic, above the health goal. 1 health-based violation since 2016.

What handles it

What was found

Arsenic, uranium, total trihalomethanes (TTHM), nitrate, haloacetic acids (HAA5), fluoride and chromium (total): Texas’s own results, samples taken from May 20, 2020 to May 20, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal2

Arsenic

Comes from the source

Above the health goal

2.9ppb

Highest yearly average, 2021 to 2025

2025, one sample: 2.7 ppb

Averaged by year, the highest was 2.9 ppb, in 2022: below EPA’s legal limit of 10 ppb, but above its health goal of zero. In 2025, the latest year on file, its one sample was 2.7 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 4.6 ppb, in 2016.

What handles it

  • NSF/ANSI 58 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
  • NSF/ANSI 53 look for “Arsenic (Pentavalent)<=50 ppb Reduction”

Uranium

Comes from the source

Above the health goal

2.9ppb

Highest yearly average, 2024

Averaged by year, the highest was 2.9 ppb, in 2024: below EPA’s legal limit of 30 ppb, but above its health goal of zero. Its highest single sample was 4.0 ppb. That is the only year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 2.6 ppb, in 2018.

What handles it

Below EPA’s limits5

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

40.5ppb

Highest yearly average, 2020 to 2026

Averaged by year, the highest was 40.5 ppb, in 2026, below EPA’s legal limit of 80 ppb. Its highest single sample was 53.2 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 59.2 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

4.2ppm

Highest sample; found in 14 of 14

2026 average: 2.2 ppm

The highest sample, in 2022, was 4.2 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its two samples averaged 2.2 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 7.1 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

14.4ppb

Highest yearly average, 2020 to 2026

2026 average: 12.8 ppb

Averaged by year, the highest was 14.4 ppb, in 2025, below EPA’s legal limit of 60 ppb. Its highest single sample was 18.3 ppb. In 2026, the latest year on file, its two samples averaged 12.8 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 20.5 ppb, in 2019.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.61ppm

Highest yearly average, 2021 to 2024

2024 average: 0.57 ppm

Averaged by year, the highest was 0.61 ppm, in 2021, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.69 ppm. In 2024, the latest year on file, its two samples averaged 0.57 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.64 ppm, in 2018.

What handles it

Chromium (total)

Comes from the source

Below EPA’s limits

6.8ppb

Highest yearly average, 2021 to 2025

2025, one sample: 1.9 ppb

Averaged by year, the highest was 6.8 ppb, in 2022, below EPA’s legal limit of 100 ppb. In 2025, the latest year on file, its one sample was 1.9 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 9.3 ppb, in 2013.

What handles it

One compound tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • 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.”

  • NSF/ANSI 53

    Claim: Arsenic (Pentavalent)<=50 ppb Reduction

    For: Arsenic

    Other certifiers’ wording: Arsenic (III) (50 ppb influent level)

  • NSF/ANSI 58

    Claims: Arsenic (Pentavalent)<=50 ppb Reduction, Uranium

    For: Arsenic, Uranium

    Other certifiers’ wording: Arsenic (Pentavalent)<=300 ppb Reduction; Arsenic (V) (300 ppb influent level)

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

Disclosure: TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money

Compare five-year costs

The best reverse osmosis systems, ranked

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Lead and Copper Rule RevisionsThe required inventory of lead service lines was not completed or submitted on time.EPA: LSL InventoryOct. 17, 2024—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 8 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Arsenic, uranium, total trihalomethanes (TTHM), nitrate, haloacetic acids (HAA5), fluoride and chromium (total) results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Tom Green County FWSD 3’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 20, 2020 to May 20, 2026.

Testing your own tap

Tom Green County FWSD 3’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 lab Texas certifies closest to the area Tom Green County FWSD 3 serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • SKG Engineering, LLC

    San Angelo, TX · about 15 miles

    Certified for bacteria

    (325) 655-1288

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 TX2260052. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

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