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Knob Hill Water System Denton

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
234 people
Connections
78
Water source
Groundwater
Based in
Little Elm, TX
County
Denton
Owner
Private
The ZIP code it serves

75068

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. 1 health-based violation since 2016.

What was found

Fluoride, total trihalomethanes (TTHM), nitrate, chromium (total), arsenic, haloacetic acids (HAA5) and uranium: Texas’s own results, samples taken from March 19, 2020 to Feb. 5, 2026, with EPA’s 2012 to 2019 file for earlier years.

Below EPA’s limits4

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.26ppm

Highest yearly average, 2022 to 2025

2025 average: 0.17 ppm

Averaged by year, the highest was 0.26 ppm, in 2022, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.36 ppm. In 2025, the latest year on file, its two samples averaged 0.17 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.29 ppm, in 2019.

What handles it

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

4.8ppb

Highest yearly average, 2022 to 2025

2025: not found

Averaged by year, the highest was 4.8 ppb, in 2022, below EPA’s legal limit of 80 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 4.3 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

Below EPA’s limits

0.39ppm

Highest sample; found in 12 of 14

2026 average: 0.013 ppm

The highest sample, in 2020, was 0.39 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its two samples averaged 0.013 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.51 ppm, in 2017.

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

1.5ppb

Highest yearly average, 2021 to 2024

2024: not found

Averaged by year, the highest was 1.5 ppb, in 2021, below EPA’s legal limit of 100 ppb. Its highest single sample was 3.0 ppb. In 2024, the latest year on file, it wasn’t found in any of its two samples.

What handles it

4 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Haloacetic acids (HAA5)
  • Lead
  • Uranium

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Lead and Copper Rule RevisionsThe required inventory of lead service lines was not completed or submitted on time.EPA: LSL InventoryOct. 17, 2024—Unaddressed
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 11 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Fluoride, total trihalomethanes (TTHM), nitrate, chromium (total), arsenic, haloacetic acids (HAA5) and uranium results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Knob Hill Water System Denton’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 19, 2020 to Feb. 5, 2026.

Testing your own tap

Knob Hill Water System Denton’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 Knob Hill Water System Denton serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Pace Analytical Services, LLC -Dallas TX

    Allen, TX · about 15 miles

    Certified for bacteria

    (972) 727-1123

  • Southern Petroleum Laboratories, Inc. - Plano

    Plano, TX · about 19 miles

    Certified for bacteria, lead and copper

    (972) 424-6422

  • Eurofins Xenco, LLC -Dallas

    Dallas, TX · about 21 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 TX0610068. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Denton County

All Texas utilities

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