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Marks Glen Subdivision

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
261 people
Connections
87
Water source
Groundwater
Based in
Austin, TX
County
Harris
Owner
Private
The ZIP code it serves

77429

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 1994 to 2024.

Fluoride, nitrate, arsenic, chromium (total), haloacetic acids (HAA5), total trihalomethanes (TTHM) and uranium: Texas’s own results, samples taken from Dec. 7, 2020 to Sept. 14, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal1

Lead

Comes from pipes, often your own

Above the health goal

2.0ppb

90th percentile, 2024

In the latest period, 9 in 10 homes sampled were at or below 2.0 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 limits2

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.17ppm

Highest yearly average, 2022 to 2025

Averaged by year, the highest was 0.17 ppm, in 2025, below EPA’s legal limit of 4.0 ppm. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.16 ppm, in 2016.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

0.39ppm

Highest sample; found in 7 of 7

2026, one sample: 0.25 ppm

The highest sample, in 2023, was 0.39 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its one sample was 0.25 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.33 ppm, in 2017.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
5 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Chromium (total)
  • Haloacetic acids (HAA5)
  • Total trihalomethanes (TTHM)
  • 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 2 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Fluoride, nitrate, arsenic, chromium (total), haloacetic acids (HAA5), total trihalomethanes (TTHM) and uranium results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Marks Glen Subdivision’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 Dec. 7, 2020 to Sept. 14, 2026.

Testing your own tap

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

  • Eurofins EMLab P&K – Houston

    Houston, TX · about 11 miles

    Certified for bacteria

    (281) 940-2580

  • R&C Joy, Inc.

    Katy, TX · about 12 miles

    Certified for bacteria

    (281) 858-5988

  • Water Utility Services, Inc.

    Spring, TX · about 12 miles

    Certified for bacteria

    (281) 290-0704

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 TX1011510. Rebuilt from EPA data on Oct. 18, 2026.

Also in Harris County

All Texas utilities

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