North Custer Road Plant
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
- 2,754 people
- Connections
- 918
- Water source
- Groundwater
- Based in
- Austin, TX
- County
- Collin
- Owner
- Private
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
Fluoride, haloacetic acids (HAA5), chromium (total), total trihalomethanes (TTHM), nitrate, arsenic and uranium: Texas’s own results, samples taken from June 21, 2022 to Sept. 10, 2026.
Below EPA’s limits5
Fluoride
Forms or is added in treatment
1.7ppm
Highest yearly average, 2022 to 2025
Averaged by year, the highest was 1.7 ppm, in 2025, below EPA’s legal limit of 4.0 ppm. That was also the latest year on file.
What handles it
- NSF/ANSI 58 look for “Fluoride Reduction”
- NSF/ANSI 53 look for “Fluoride”
Haloacetic acids (HAA5)
Forms or is added in treatment
7.4ppb
Highest yearly average, 2022 to 2026
2026: not found
Averaged by year, the highest was 7.4 ppb, in 2024, below EPA’s legal limit of 60 ppb. Its highest single sample was 9.6 ppb. In 2026, the latest year on file, it wasn’t found in any of its two samples.
What handles it
No certification claim covers this compound yet.
Chromium (total)
Comes from the source
8.0ppb
Highest yearly average, 2022 to 2025
2025, one sample: 5.7 ppb
Averaged by year, the highest was 8.0 ppb, in 2022, below EPA’s legal limit of 100 ppb. In 2025, the latest year on file, its one sample was 5.7 ppb.
What handles it
- NSF/ANSI 58 look for “Chromium (Hexavalent) Reduction”
- NSF/ANSI 53 look for “Chromium Reduction”
Total trihalomethanes (TTHM)
Forms or is added in treatment
6.2ppb
Highest yearly average, 2022 to 2026
2026: not found
Averaged by year, the highest was 6.2 ppb, in 2025, below EPA’s legal limit of 80 ppb. Its highest single sample was 6.7 ppb. In 2026, the latest year on file, it wasn’t found in any of its two samples.
What handles it
- NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
- NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”
Nitrate
Comes from the source
0.13ppm
Highest sample; found in 4 of 5
2026, one sample: 0.054 ppm
The highest sample, in 2023, was 0.13 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its one sample was 0.054 ppm.
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. There are 4 monitoring or reporting violations: a sample missed, late or not reported.
What this report can’t tell you
Everything else. Fluoride, haloacetic acids (HAA5), chromium (total), total trihalomethanes (TTHM), nitrate, arsenic and uranium results here are Texas’s own from 2022 on, with EPA’s national file for 2012 to 2019. North Custer Road Plant’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 June 21, 2022 to Sept. 10, 2026.
Testing your own tap
No lab Texas certifies is within 75 miles of the area North Custer Road Plant serves on the state’s list. Some take samples by mail; the state’s page lists them all.
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 TexasSources
- EPA UCMR 5 occurrence data, file of Oct. 15, 2026
- EPA SDWA bulk download (SDWIS federal data), 2026 Q3
- Texas Commission on Environmental Quality, Texas Drinking Water Viewer, results from Jan. 7, 2020 to Oct. 6, 2026, read Oct. 16, 2026
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID TX0430077. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Nothing here is above a health goalIn EPA’s and Texas’s records for this utility. They don’t cover everything, which is why the next step matters.Every contaminant TapBuff tracks
- Get the utility’s own reportNorth Custer Road Plant must send you a water quality report every year. It covers contaminants this page does not show.How to read it
- Test your own tap for leadYour service line, solder and fixtures decide the lead at your faucet, not the utility’s average.Lead in your water: what to do
- Decide if you want a filter at allA filter for taste or chlorine is a preference, not a need. The standards say what each kind can do.NSF/ANSI standards, decoded