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Tanglewood Estates

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
720 people
Connections
240
Water source
Groundwater
Based in
Austin, TX
County
Parker
Owner
Private
The ZIP code it serves

76020

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, plus lead and copper, not everything. No health-based violations on file since 2016.

What was found

Fluoride, total trihalomethanes (TTHM), haloacetic acids (HAA5), nitrate, chromium (total), arsenic and uranium: Texas’s own results, samples taken from Aug. 24, 2020 to May 12, 2026, with EPA’s 2012 to 2019 file for earlier years.

Below EPA’s limits5

Fluoride

Forms or is added in treatment

Below EPA’s limits

1.3ppm

Highest yearly average, 2021 to 2024

2024 average: 1.2 ppm

Averaged by year, the highest was 1.3 ppm, in 2021, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 1.3 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

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

12.7ppb

Highest yearly average, 2020 to 2026

2026, one sample: 12.3 ppb

Averaged by year, the highest was 12.7 ppb, in 2023, below EPA’s legal limit of 80 ppb. In 2026, the latest year on file, its one sample was 12.3 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 18.2 ppb, in 2016.

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

3.9ppb

Highest yearly average, 2020 to 2026

2026, one sample: 3.9 ppb

Averaged by year, the highest was 3.9 ppb, in 2023, below EPA’s legal limit of 60 ppb. In 2026, the latest year on file, its one sample was 3.9 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 2.7 ppb, in 2017.

What handles it

No certification claim covers this compound yet.

Nitrate

Comes from the source

Below EPA’s limits

0.6ppm

Highest sample; found in 13 of 14

2026 average: 0.092 ppm

The highest sample, in 2022, was 0.6 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its two samples averaged 0.092 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.6 ppm, in 2014.

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

6.0ppb

Highest yearly average, 2021 to 2024

2024 average: 2.1 ppb

Averaged by year, the highest was 6.0 ppb, in 2021, below EPA’s legal limit of 100 ppb. In 2024, the latest year on file, its two samples averaged 2.1 ppb.

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

Violations since 2016

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

What this report can’t tell you

  • Everything else. Fluoride, total trihalomethanes (TTHM), 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. Tanglewood Estates’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 Aug. 24, 2020 to May 12, 2026.

Testing your own tap

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

  • Tarrant County Public Health Laboratory

    Fort Worth, TX · about 18 miles

    Certified for bacteria

    (817) 321-4758

  • Pace Analytical Services, LLC -Dallas TX

    Fort Worth, TX · about 22 miles

    Certified for bacteria

    (817) 616-5030

  • Eurofins Xenco, LLC -Dallas

    Dallas, TX · about 40 miles

    Certified for bacteria

    (281) 240-4200

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 TX1840011. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Parker County

All Texas utilities

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