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North Texas MWD Tawakoni WTP

What EPA’s and Texas’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals, plus violations since 2016, with the certification that handles each result.

Serves
90 people
Connections
792,283
Water source
Surface water
Based in
Wylie, TX
County
Kaufman
Owner
Local government

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, not everything. No health-based violations on file since 2016.

What was found

Total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, nitrate, chromium (total), arsenic and uranium: Texas’s own results, samples taken from Sept. 16, 2020 to Sept. 7, 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

62.5ppb

Highest yearly average, 2020 to 2026

2026 average: 51.8 ppb

Averaged by year, the highest was 62.5 ppb, in 2025, below EPA’s legal limit of 80 ppb. Its highest single sample was 82.3 ppb. In 2026, the latest year on file, its three samples averaged 51.8 ppb. EPA recorded no violation for total trihalomethanes (TTHM) at this utility since 2020. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 52.6 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

24.1ppb

Highest yearly average, 2020 to 2026

2026 average: 23.1 ppb

Averaged by year, the highest was 24.1 ppb, in 2024, below EPA’s legal limit of 60 ppb. Its highest single sample was 28.7 ppb. In 2026, the latest year on file, its three samples averaged 23.1 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 27.6 ppb, in 2015.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.66ppm

Highest yearly average, 2020 to 2025

2025, one sample: 0.19 ppm

Averaged by year, the highest was 0.66 ppm, in 2023, below EPA’s legal limit of 4.0 ppm. In 2025, the latest year on file, its one sample was 0.19 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.74 ppm, in 2012.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

0.38ppm

Highest sample; found in 6 of 6

2025, one sample: 0.23 ppm

The highest sample, in 2023, was 0.38 ppm, below EPA’s legal limit of 10 ppm. In 2025, the latest year on file, its one sample was 0.23 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 1.1 ppm, in 2015.

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

1.3ppb

Highest yearly average, 2020 to 2025

2025: not found

Averaged by year, the highest was 1.3 ppb, in 2020, below EPA’s legal limit of 100 ppb. In 2025, the latest year on file, it wasn’t found in its one sample. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.89 ppb, in 2016.

What handles it

2 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Uranium

Violations since 2016

No health-based violations on file with EPA since 2016.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, nitrate, chromium (total), arsenic and uranium results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. North Texas MWD Tawakoni WTP’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 Sept. 16, 2020 to Sept. 7, 2026.

Testing your own tap

North Texas MWD Tawakoni WTP’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.

No lab Texas certifies is within 75 miles of the area North Texas MWD Tawakoni WTP serves on the state’s list. Some take samples by mail; the state’s page lists them all.

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 TX1290052. Rebuilt from EPA data on Oct. 18, 2026.

Also in Kaufman County

All Texas utilities

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