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Lago Vista Water System

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
54 people
Connections
18
Water source
Groundwater
Based in
Bastrop, TX
County
Guadalupe
Owner
Private
The ZIP code it serves

78648

The short answer

Nothing in EPA’s and Texas’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. 1 health-based violation since 2016.

What was found

Total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, nitrate, arsenic, chromium (total) and uranium: Texas’s own results, samples taken from March 19, 2020 to Sept. 3, 2026, with EPA’s 2012 to 2019 file for earlier years.

Below EPA’s limits4

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

66.8ppb

Highest yearly average, 2020 to 2026

2026: not found

Averaged by year, the highest was 66.8 ppb, in 2024, below EPA’s legal limit of 80 ppb. In 2026, 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 51.1 ppb, in 2014.

What handles it

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

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

12.2ppb

Highest yearly average, 2020 to 2026

2026: not found

Averaged by year, the highest was 12.2 ppb, in 2024, below EPA’s legal limit of 60 ppb. In 2026, 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 13.3 ppb, in 2014.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.38ppm

Highest yearly average, 2020 to 2026

2026: not found

Averaged by year, the highest was 0.38 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. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.37 ppm, in 2017.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

0.11ppm

Highest sample; found in 4 of 7

2026: not found

The highest sample, in 2021, was 0.11 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, it wasn’t found in its one sample. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.58 ppm, in 2012.

What handles it

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

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Lead and Copper Rule RevisionsThe required inventory of lead service lines was not completed or submitted on time.EPA: LSL InventoryOct. 17, 2024—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 118 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, nitrate, arsenic, chromium (total) and uranium results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Lago Vista Water System’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 19, 2020 to Sept. 3, 2026.

Testing your own tap

Lago Vista Water System’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 Lago Vista Water System serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Edwards Aquifer Research & Data Center, Texas State University

    San Marcos, TX · about 24 miles

    Certified for bacteria

    (512) 245-2329

  • Aqua-Tech Laboratories, Inc.

    Austin, TX · about 34 miles

    Certified for bacteria, lead and copper

    (512) 301-9559

  • Wallgren Environmental Services dba Pollution Control Services

    Universal City, TX · about 41 miles

    Certified for bacteria, lead and copper

    (210) 340-0343

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 TX0940029. Rebuilt from EPA data on Oct. 18, 2026.

Also in Guadalupe County

All Texas utilities

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