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Trinity Oaks Preserve at Round Mountain

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
171 people
Connections
18
Water source
Groundwater
Based in
Austin, TX
County
Blanco
Owner
Private
The ZIP code it serves

78611

The short answer

2 results are 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 2024.

Uranium, total trihalomethanes (TTHM), nitrate, fluoride, haloacetic acids (HAA5), arsenic and chromium (total): Texas’s own results, samples taken from March 13, 2023 to June 30, 2026.

Above the health goal2

Lead

Comes from pipes, often your own

Above the health goal

2.9ppb

90th percentile, 2024

In the latest period, 9 in 10 homes sampled were at or below 2.9 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

Uranium

Comes from the source

Above the health goal

1.7ppb

Highest yearly average, 2023

Averaged by year, the highest was 1.7 ppb, in 2023: below EPA’s legal limit of 30 ppb, but above its health goal of zero. That is the only year on file.

What handles it

Below EPA’s limits4

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

18.3ppb

Highest yearly average, 2023 to 2026

2026, one sample: 4.0 ppb

Averaged by year, the highest was 18.3 ppb, in 2023, below EPA’s legal limit of 80 ppb. In 2026, the latest year on file, its one sample was 4.0 ppb.

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

1.4ppm

Highest sample; found in 4 of 4

2026, one sample: 1.3 ppm

The highest sample, in 2025, was 1.4 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its one sample was 1.3 ppm.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.49ppm

Highest yearly average, 2023 to 2026

2026: not found

Averaged by year, the highest was 0.49 ppm, in 2023, below EPA’s legal limit of 4.0 ppm. In 2026, the latest year on file, it wasn’t found in its one sample.

What handles it

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

3.6ppb

Highest yearly average, 2023 to 2026

2026: not found

Averaged by year, the highest was 3.6 ppb, in 2023, below EPA’s legal limit of 60 ppb. In 2026, the latest year on file, it wasn’t found in its one sample.

What handles it

No certification claim covers this compound yet.

2 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Chromium (total)

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 is 1 monitoring or reporting violation: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Uranium, total trihalomethanes (TTHM), nitrate, fluoride, haloacetic acids (HAA5), arsenic and chromium (total) results here are Texas’s own from 2023 on, with EPA’s national file for 2012 to 2019. Trinity Oaks Preserve at Round Mountain’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 13, 2023 to June 30, 2026.

Testing your own tap

Trinity Oaks Preserve at Round Mountain’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 Trinity Oaks Preserve at Round Mountain serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Environmental Monitoring Lab

    Llano, TX · about 25 miles

    Certified for bacteria

    (325) 247-3295

  • Integrity Testing, Inc.

    Austin, TX · about 42 miles

    Certified for lead and copper

    (512) 891-7777

  • Texas Department of State Health Services Laboratory Services Section

    Austin, TX · about 46 miles

    Certified for bacteria, lead and copper

    (512) 458-7318

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 TX0160041. Rebuilt from EPA data on Oct. 18, 2026.

Also in Blanco County

All Texas utilities

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