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Matagorda 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
1,746 people
Connections
606
Water source
Groundwater
Based in
Matagorda, TX
County
Matagorda
Owner
Local government
The ZIP code it serves

77457

The short answer

1 result is above EPA’s legal limit, and 2 more are above the health goal. The worst: Total trihalomethanes (TTHM), above the legal limit. 1 health-based violation since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 1995 to 2025.

Total trihalomethanes (TTHM), arsenic, fluoride, haloacetic acids (HAA5), chromium (total), nitrate and uranium: Texas’s own results, samples taken from Feb. 12, 2020 to Aug. 17, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the legal limit1

Total trihalomethanes (TTHM)

Forms or is added in treatment

Above the legal limit

74.8ppb

Highest yearly average, 2020 to 2026

2026 average: 63.4 ppb

Averaged by year, the highest was 74.8 ppb, in 2025, below EPA’s legal limit of 80 ppb. Its highest single sample was 105 ppb. In 2026, the latest year on file, its five samples averaged 63.4 ppb. EPA judges this limit at each sampling point, and recorded a violation for total trihalomethanes (TTHM) at this utility in 2025. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 85.5 ppb, in 2014, and EPA recorded violations in 2014 and 2015.

What handles it

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

Above the health goal2

Arsenic

Comes from the source

Above the health goal

2.8ppb

Highest yearly average, 2021 to 2025

2025: not found

Averaged by year, the highest was 2.8 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, it wasn’t found in its one sample.

What handles it

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

Lead

Comes from pipes, often your own

Above the health goal

2.5ppb

90th percentile, 2023 to 2025

In the latest period, 9 in 10 homes sampled were at or below 2.5 ppb, below EPA’s action level of 15 ppb. The action level drops to 10 ppb on Nov. 1, 2027. EPA’s health goal for lead is zero.

What handles it

Below EPA’s limits2

Fluoride

Forms or is added in treatment

Below EPA’s limits

1.5ppm

Highest yearly average, 2021 to 2024

2024 average: 1.2 ppm

Averaged by year, the highest was 1.5 ppm, in 2021, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 1.5 ppm. In 2024, the latest year on file, its two samples averaged 1.2 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 1.4 ppm, in 2012.

What handles it

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

10.1ppb

Highest yearly average, 2020 to 2026

2026 average: 7.2 ppb

Averaged by year, the highest was 10.1 ppb, in 2022, below EPA’s legal limit of 60 ppb. Its highest single sample was 14.6 ppb. In 2026, the latest year on file, its five samples averaged 7.2 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 12.4 ppb, in 2013.

What handles it

No certification claim covers this compound yet.

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

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, Arsenic (Pentavalent)<=50 ppb Reduction, Lead Reduction

    For: Total trihalomethanes (TTHM), Arsenic, Lead

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

  • NSF/ANSI 58

    Claims: Trihalomethanes (TTHM) Reduction, Arsenic (Pentavalent)<=50 ppb Reduction, Lead Reduction

    For: Total trihalomethanes (TTHM), Arsenic, Lead

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

At the tap, or for the whole house?

Lead and copper usually come from pipes and fixtures inside or near your home. A whole-house system sits where water enters, so it cannot catch what your own plumbing adds after it. For those, the filter that counts is the one at the tap. 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

The best water filters for lead, ranked

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
TTHMThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2025 to Dec. 31, 20250.083 MG/LResolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 5 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), arsenic, fluoride, haloacetic acids (HAA5), chromium (total), nitrate and uranium results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Matagorda 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 Feb. 12, 2020 to Aug. 17, 2026.

Testing your own tap

Matagorda 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 Matagorda WSC serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Brazoria County Health Department Water Laboratory

    Angleton, TX · about 40 miles

    Certified for bacteria

    (979) 864-1628

  • Eurofins Xenco, LLC -Houston

    Stafford, TX · about 65 miles

    Certified for lead and copper

    (281) 240-4200

  • Pace Analytical Services, LLC -Dallas TX

    Victoria, TX · about 67 miles

    Certified for bacteria

    (361) 465-7989

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 TX1610013. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Matagorda County

All Texas utilities

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