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Oak Hill Development We

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
30 people
Connections
19
Water source
Groundwater
Based in
Flower Mound, TX
County
Parker
Owner
Private

The short answer

1 result is above the health goal. The worst: Lead, above the health goal. No health-based violations on file since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2025 to 2026.

Fluoride, total trihalomethanes (TTHM), chromium (total), nitrate, arsenic, haloacetic acids (HAA5) and uranium: Texas’s own results, samples taken from March 24, 2025 to May 26, 2026.

Above the health goal1

Lead

Comes from pipes, often your own

Above the health goal

1.2ppb

90th percentile, 2026

In the latest period, 9 in 10 homes sampled were at or below 1.2 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 limits4

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.39ppm

Highest yearly average, 2025

Averaged by year, the highest was 0.39 ppm, in 2025, below EPA’s legal limit of 4.0 ppm. That is the only year on file.

What handles it

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

4.0ppb

Highest yearly average, 2025 to 2026

Averaged by year, the highest was 4.0 ppb, in 2026, below EPA’s legal limit of 80 ppb. That was also the latest year on file.

What handles it

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

Chromium (total)

Comes from the source

Below EPA’s limits

1.7ppb

Highest yearly average, 2025

Averaged by year, the highest was 1.7 ppb, in 2025, below EPA’s legal limit of 100 ppb. That is the only year on file.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

0.032ppm

Highest sample; found in 2 of 2

2026, one sample: 0.032 ppm

The highest sample, in 2026, was 0.032 ppm, below EPA’s legal limit of 10 ppm. That was also the latest year on file, and its one sample was 0.032 ppm.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Haloacetic acids (HAA5)
  • 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.”

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 water filters for lead, ranked

Violations since 2016

No health-based violations on file with EPA since 2016. There are 3 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Fluoride, total trihalomethanes (TTHM), chromium (total), nitrate, arsenic, haloacetic acids (HAA5) and uranium results here are Texas’s own from 2025 on, with EPA’s national file for 2012 to 2019. Oak Hill Development We’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 24, 2025 to May 26, 2026.

Testing your own tap

Oak Hill Development We’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 Oak Hill Development We 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 TX1840114. Rebuilt from EPA data on Oct. 18, 2026.

Also in Parker County

All Texas utilities

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