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Miller Grove 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
2,265 people
Connections
755
Water source
Groundwater
Based in
Cumby, TX
County
Hopkins
Owner
Local government
The ZIP code it serves

75433

The short answer

1 result is above EPA’s legal limit. The worst: Total trihalomethanes (TTHM), above the legal limit. 6 health-based violations since 2016.

What handles it

What was found

Total trihalomethanes (TTHM), fluoride, haloacetic acids (HAA5), nitrate, chromium (total), arsenic and uranium: Texas’s own results, samples taken from March 30, 2020 to July 21, 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

76.5ppb

Highest yearly average, 2020 to 2026

2026 average: 63.8 ppb

Averaged by year, the highest was 76.5 ppb, in 2022, below EPA’s legal limit of 80 ppb. Its highest single sample was 92.6 ppb. In 2026, the latest year on file, its six samples averaged 63.8 ppb. EPA judges this limit at each sampling point, and recorded a violation for total trihalomethanes (TTHM) at this utility in 2020. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 87.5 ppb, in 2014, and EPA recorded violations in 2014, 2015 and 2019.

What handles it

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

Below EPA’s limits4

Fluoride

Forms or is added in treatment

Below EPA’s limits

2.5ppm

Highest yearly average, 2021 to 2024

Averaged by year, the highest was 2.5 ppm, in 2024, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 3.0 ppm. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 2.7 ppm, in 2018.

What handles it

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

21.1ppb

Highest yearly average, 2020 to 2026

2026 average: 13.7 ppb

Averaged by year, the highest was 21.1 ppb, in 2025, below EPA’s legal limit of 60 ppb. Its highest single sample was 29.5 ppb. In 2026, the latest year on file, its six samples averaged 13.7 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 22.2 ppb, in 2014.

What handles it

No certification claim covers this compound yet.

Nitrate

Comes from the source

Below EPA’s limits

0.081ppm

Highest sample; found in 14 of 14

2026 average: 0.066 ppm

The highest sample, in 2026, was 0.081 ppm, below EPA’s legal limit of 10 ppm. That was also the latest year on file, and its two samples averaged 0.066 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.1 ppm, in 2013.

What handles it

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

Chromium (total)

Comes from the source

Below EPA’s limits

0.6ppb

Highest yearly average, 2021 to 2024

2024: not found

Averaged by year, the highest was 0.6 ppb, in 2021, below EPA’s legal limit of 100 ppb. Its highest single sample was 1.2 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 4.8 ppb, 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
  • Lead
  • 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

    Claim: Trihalomethanes (TTHM) Reduction

    For: Total trihalomethanes (TTHM)

    Other certifiers’ wording: VOC Reduction

  • NSF/ANSI 58

    Claim: Trihalomethanes (TTHM) Reduction

    For: Total trihalomethanes (TTHM)

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
TTHMThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2020 to Sept. 30, 20200.083 MG/LResolved
TTHMThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2020 to June 30, 20200.087 MG/LResolved
TTHMThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2020 to March 31, 20200.091 MG/LResolved
TTHMThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2019 to Dec. 31, 20190.087 MG/LResolved
TTHMThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2019 to Dec. 31, 20190.082 MG/LResolved
TTHMThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2019 to Sept. 30, 20190.086 MG/LResolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 40 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), fluoride, haloacetic acids (HAA5), nitrate, chromium (total), arsenic and uranium results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Miller Grove 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 30, 2020 to July 21, 2026.

Testing your own tap

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

  • Southern Petroleum Laboratories, Inc. - Plano

    Plano, TX · about 51 miles

    Certified for bacteria, lead and copper

    (972) 424-6422

  • Pace Analytical Services, LLC -Dallas TX

    Allen, TX · about 52 miles

    Certified for bacteria

    (972) 727-1123

  • Northeast Texas Public Health District Laboratory

    Tyler, TX · about 58 miles

    Certified for bacteria

    (903) 535-0090

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 TX1120016. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Hopkins County

All Texas utilities

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