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Swenson 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
49 people
Connections
29
Water source
Surface water bought from another system
Based in
Aspermont, TX
County
Stonewall
Owner
Local government
The ZIP code it serves

79502

The short answer

2 results are above EPA’s legal limit. The worst: Total trihalomethanes (TTHM), above the legal limit. 7 health-based violations since 2016.

What handles it

What was found

Total trihalomethanes (TTHM), nitrate and haloacetic acids (HAA5): Texas’s own results, samples taken from March 2, 2020 to Sept. 1, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the legal limit2

Total trihalomethanes (TTHM)

Forms or is added in treatment

Above the legal limit

140ppb

Highest yearly average, 2021 to 2026

2026 average: 81.9 ppb

Averaged by year, the highest was 140 ppb, in 2025, above EPA’s legal limit of 80 ppb. Its highest single sample was 193 ppb. In 2026, the latest year on file, its three samples averaged 81.9 ppb, above the limit. EPA recorded violations for total trihalomethanes (TTHM) at this utility in 2025 and 2026. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 67.6 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

Above the legal limit

11.6ppm

Highest sample; found in 28 of 28

2026 average: 9.7 ppm

From 2024 to 2026, two samples were above EPA’s legal limit of 10 ppm, the highest 11.6 ppm in 2026. Two have no follow-up sample on file within 30 days. That was also the latest year on file, and its three samples averaged 9.7 ppm. EPA recorded a violation for nitrate at this utility in 2026.

What handles it

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

Below EPA’s limits1

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

32.9ppb

Highest yearly average, 2021 to 2026

2026 average: 17 ppb

Averaged by year, the highest was 32.9 ppb, in 2023, below EPA’s legal limit of 60 ppb. In 2026, the latest year on file, its three samples averaged 17 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 36.3 ppb, in 2019.

What handles it

No certification claim covers this compound yet.

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

    Claims: Trihalomethanes (TTHM) Reduction, Nitrate/Nitrite (30 ppm challenge)

    For: Total trihalomethanes (TTHM), Nitrate

    Other certifiers’ wording: VOC Reduction

  • NSF/ANSI 58

    Claims: Trihalomethanes (TTHM) Reduction, Nitrate/Nitrite Reduction

    For: Total trihalomethanes (TTHM), Nitrate

    Other certifiers’ wording: Nitrate

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

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Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
NitrateA sample was above the legal limit, for a contaminant judged one sample at a time.EPA: Maximum Contaminant Level Violation, Single SampleApril 1, 2026 to June 30, 202612 MG/LArchived
TTHMThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2026 to June 30, 20260.12 MG/LArchived
TTHMThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2026 to March 31, 20260.15 MG/LArchived
TTHMThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2025 to Dec. 31, 20250.14 MG/LArchived
TTHMThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2025 to Sept. 30, 20250.12 MG/LArchived
TTHMThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2025 to June 30, 20250.13 MG/LArchived
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. 12 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), nitrate and haloacetic acids (HAA5) results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Swenson 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 March 2, 2020 to Sept. 1, 2026.

Testing your own tap

Swenson 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 2 labs Texas certifies closest to the area Swenson WSC serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Sweetwater -Nolan County Health Department

    Sweetwater, TX · about 50 miles

    Certified for bacteria

    (325) 235-5463

  • Abilene–Taylor County Public Health District

    Abilene, TX · about 54 miles

    Certified for bacteria

    (325) 692-5600

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 TX2170002. Rebuilt from EPA data on Oct. 18, 2026.

Nearby

All Texas utilities

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