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Flag Creek Ranch

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
117 people
Connections
40
Water source
Groundwater
Based in
Saint Louis, TX
County
Llano
Owner
Private
The ZIP code it serves

78643

The short answer

1 result is above EPA’s legal limit, and 2 more are above the health goal. The worst: Total trihalomethanes (TTHM), above the legal limit. 3 health-based violations since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 1995 to 2023.

Total trihalomethanes (TTHM), uranium, nitrate, fluoride, haloacetic acids (HAA5), arsenic and chromium (total): Texas’s own results, samples taken from Feb. 4, 2020 to July 8, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the legal limit1

Total trihalomethanes (TTHM)

Forms or is added in treatment

Above the legal limit

75.9ppb

Highest yearly average, 2022 to 2026

2026 average: 59.8 ppb

Averaged by year, the highest was 75.9 ppb, in 2025, below EPA’s legal limit of 80 ppb. Its highest single sample was 142 ppb. In 2026, the latest year on file, its three samples averaged 59.8 ppb. EPA judges this limit at each sampling point, and recorded violations for total trihalomethanes (TTHM) at this utility in 2025 and 2026. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 70.4 ppb, in 2012.

What handles it

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

Above the health goal2

Uranium

Comes from the source

Above the health goal

23.6ppb

Highest yearly average, 2020 to 2025

2025 average: 21.9 ppb

Averaged by year, the highest was 23.6 ppb, in 2022: below EPA’s legal limit of 30 ppb, but above its health goal of zero. Its highest single sample was 26.1 ppb. In 2025, the latest year on file, its four samples averaged 21.9 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 22.5 ppb, in 2019.

What handles it

Lead

Comes from pipes, often your own

Above the health goal

1.1ppb

90th percentile, 2021 to 2023

In the latest period, 9 in 10 homes sampled were at or below 1.1 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 limits3

Nitrate

Comes from the source

Below EPA’s limits

7.8ppm

Highest sample; found in 27 of 27

2026 average: 4.5 ppm

The highest sample, in 2023, was 7.8 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its three samples averaged 4.5 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 7.7 ppm, in 2018.

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

1.0ppm

Highest yearly average, 2022 to 2025

Averaged by year, the highest was 1.0 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 1.0 ppm, in 2013.

What handles it

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

15.4ppb

Highest yearly average, 2022 to 2026

2026 average: 14.2 ppb

Averaged by year, the highest was 15.4 ppb, in 2025, below EPA’s legal limit of 60 ppb. Its highest single sample was 27.5 ppb. In 2026, the latest year on file, its three samples averaged 14.2 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 13.8 ppb, in 2012.

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.”

  • NSF/ANSI 53

    Claims: Trihalomethanes (TTHM) Reduction, Lead Reduction

    For: Total trihalomethanes (TTHM), Lead

    Other certifiers’ wording: VOC Reduction

  • NSF/ANSI 58

    Claims: Trihalomethanes (TTHM) Reduction, Uranium, Lead Reduction

    For: Total trihalomethanes (TTHM), Uranium, 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

Contaminant or ruleTypePeriodMeasuredStatus
TTHMThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2026 to June 30, 20260.082 MG/LArchived
TTHMThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2025 to Sept. 30, 20250.082 MG/LResolved
Gross alpha radiation (excluding radon and uranium)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2023 to Sept. 30, 202316 PCI/LResolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 13 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), uranium, nitrate, fluoride, haloacetic acids (HAA5), arsenic and chromium (total) results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Flag Creek Ranch’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. 4, 2020 to July 8, 2026.

Testing your own tap

Flag Creek Ranch’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 Flag Creek Ranch 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 · under a mile

    Certified for bacteria

    (325) 247-3295

  • Integrity Testing, Inc.

    Austin, TX · about 59 miles

    Certified for lead and copper

    (512) 891-7777

  • Texas Department of State Health Services Laboratory Services Section

    Austin, TX · about 62 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 TX1500112. Rebuilt from EPA data on Oct. 18, 2026.

Also in Llano County

All Texas utilities

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