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Walraven 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
198 people
Connections
66
Water source
Groundwater
Based in
Austin, TX
County
Harris
Owner
Private
The ZIP code it serves

77336

The short answer

2 results are above the health goal. The worst: Arsenic, above the health goal. 4 health-based violations since 2016.

What handles it

What was found

Arsenic, uranium, fluoride, chromium (total), haloacetic acids (HAA5), nitrate and total trihalomethanes (TTHM): Texas’s own results, samples taken from Feb. 26, 2020 to Aug. 11, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal2

Arsenic

Comes from the source

Above the health goal

2.9ppb

Highest yearly average, 2021 to 2024

2024, one sample: 2.6 ppb

Averaged by year, the highest was 2.9 ppb, in 2021: below EPA’s legal limit of 10 ppb, but above its health goal of zero. In 2024, the latest year on file, its one sample was 2.6 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 3.0 ppb, in 2015.

What handles it

  • NSF/ANSI 58 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
  • NSF/ANSI 53 look for “Arsenic (Pentavalent)<=50 ppb Reduction”

Uranium

Comes from the source

Above the health goal

0.85ppb

Highest yearly average, 2020 to 2025

2025: not found

Averaged by year, the highest was 0.85 ppb, in 2020: below EPA’s legal limit of 30 ppb, but above its health goal of zero. Its highest single sample was 1.8 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 2.5 ppb, in 2016.

What handles it

Below EPA’s limits1

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.17ppm

Highest yearly average, 2021 to 2024

2024, one sample: 0.16 ppm

Averaged by year, the highest was 0.17 ppm, in 2021, below EPA’s legal limit of 4.0 ppm. In 2024, the latest year on file, its one sample was 0.16 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.19 ppm, in 2012.

What handles it

5 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Chromium (total)
  • Haloacetic acids (HAA5)
  • Lead
  • Nitrate
  • Total trihalomethanes (TTHM)

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.”

  • NSF/ANSI 53

    Claim: Arsenic (Pentavalent)<=50 ppb Reduction

    For: Arsenic

    Other certifiers’ wording: Arsenic (III) (50 ppb influent level)

  • NSF/ANSI 58

    Claims: Arsenic (Pentavalent)<=50 ppb Reduction, Uranium

    For: Arsenic, Uranium

    Other certifiers’ wording: Arsenic (Pentavalent)<=300 ppb Reduction; Arsenic (V) (300 ppb influent level)

At the tap, or for the whole house?

These come with the water itself, so a whole-house system certified for the same claims treats every tap and shower. A filter at the tap treats drinking water for much less. 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

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The best reverse osmosis systems, ranked

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Gross alpha radiation (excluding radon and uranium)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2019 to Sept. 30, 201917 PCI/LResolved
Gross alpha radiation (excluding radon and uranium)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2019 to June 30, 201919 PCI/LResolved
Gross alpha radiation (excluding radon and uranium)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2019 to March 31, 201917 PCI/LResolved
Gross alpha radiation (excluding radon and uranium)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2018 to Dec. 31, 201818 PCI/LResolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 2 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Arsenic, uranium, fluoride, chromium (total), haloacetic acids (HAA5), nitrate and total trihalomethanes (TTHM) results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Walraven 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 Feb. 26, 2020 to Aug. 11, 2026.

Testing your own tap

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

  • Water Utility Services, Inc.

    Spring, TX · about 22 miles

    Certified for bacteria

    (281) 290-0704

  • A & B Environmental Services, Inc.

    Houston, TX · about 23 miles

    Certified for bacteria, lead and copper

    (713) 453-6060

  • Nova Biologicals, Inc.

    Conroe, TX · about 27 miles

    Certified for bacteria

    (936) 756-5333

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 TX1013195. Rebuilt from EPA data on Oct. 18, 2026.

Also in Harris County

All Texas utilities

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