Sundance Addition

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: 834 people
Connections: 278
Water source: Groundwater
Based in: Austin, TX
County: Johnson
Owner: Private

The ZIP code it serves

76058

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. No health-based violations on file since 2016.

What was found

Lead and copper: lead at 0.35 mg/L (1999) is left out of this report: more than 20 times the action level, it looks like µg/L entered as mg/L.

Total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, chromium (total), nitrate, arsenic and uranium: Texas’s own results, samples taken from July 22, 2020 to May 27, 2026, with EPA’s 2012 to 2019 file for earlier years.

Below EPA’s limits5

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

30.3ppb

Highest yearly average, 2020 to 2026

2026 average: 17.9 ppb

Averaged by year, the highest was 30.3 ppb, in 2023, below EPA’s legal limit of 80 ppb. Its highest single sample was 38.3 ppb. In 2026, the latest year on file, its two samples averaged 17.9 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 16 ppb, in 2013.

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

19.4ppb

Highest yearly average, 2020 to 2026

2026 average: 3.9 ppb

Averaged by year, the highest was 19.4 ppb, in 2023, below EPA’s legal limit of 60 ppb. Its highest single sample was 22.7 ppb. In 2026, the latest year on file, its two samples averaged 3.9 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 11.4 ppb, in 2013.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

1.1ppm

Highest yearly average, 2021 to 2025

2025, one sample: 1.1 ppm

Averaged by year, the highest was 1.1 ppm, in 2022, below EPA’s legal limit of 4.0 ppm. In 2025, the latest year on file, its one sample was 1.1 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 1.0 ppm, in 2019.

What handles it

NSF/ANSI 58 look for “Fluoride Reduction”
NSF/ANSI 53 look for “Fluoride”

Chromium (total)

Comes from the source

Below EPA’s limits

2.0ppb

Highest yearly average, 2022 to 2025

Averaged by year, the highest was 2.0 ppb, in 2025, below EPA’s legal limit of 100 ppb. Its highest single sample was 2.3 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 2.5 ppb, in 2012.

What handles it

NSF/ANSI 58 look for “Chromium (Hexavalent) Reduction”
NSF/ANSI 53 look for “Chromium Reduction”

Nitrate

Comes from the source

Below EPA’s limits

0.071ppm

Highest sample; found in 21 of 21

2026 average: 0.033 ppm

The highest sample, in 2022, was 0.071 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its three samples averaged 0.033 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.28 ppm, in 2012.

What handles it

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

3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.

Arsenic
Lead
Uranium

Violations since 2016

No health-based violations on file with EPA since 2016.

What this report can’t tell you

Everything else. Total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, chromium (total), nitrate, arsenic and uranium results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Sundance Addition’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 July 22, 2020 to May 27, 2026.

Testing your own tap

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

Tarrant County Public Health Laboratory
Fort Worth, TX · about 19 miles
Certified for bacteria
(817) 321-4758
Pace Analytical Services, LLC -Dallas TX
Fort Worth, TX · about 26 miles
Certified for bacteria
(817) 616-5030
Environmental Monitoring Lab
Hillsboro, TX · about 35 miles
Certified for bacteria
(254) 582-2622

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