Comanche Harbor & Port Ocall

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: 1,764 people
Connections: 588
Water source: Surface water bought from another system
Based in: Austin, TX
County: Hood
Owner: Private

The ZIP code it serves

76048

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

Total trihalomethanes (TTHM), haloacetic acids (HAA5), nitrate, fluoride, chromium (total), arsenic and uranium: Texas’s own results, samples taken from Jan. 28, 2020 to Aug. 19, 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

60.7ppb

Highest yearly average, 2020 to 2026

2026 average: 49.1 ppb

Averaged by year, the highest was 60.7 ppb, in 2022, below EPA’s legal limit of 80 ppb. Its highest single sample was 144 ppb. In 2026, the latest year on file, its three samples averaged 49.1 ppb. EPA recorded no violation for total trihalomethanes (TTHM) at this utility since 2020. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 28.6 ppb, in 2016.

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

14.6ppb

Highest yearly average, 2020 to 2026

2026 average: 12.9 ppb

Averaged by year, the highest was 14.6 ppb, in 2021, below EPA’s legal limit of 60 ppb. Its highest single sample was 30.3 ppb. In 2026, the latest year on file, its three samples averaged 12.9 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 12.7 ppb, in 2017.

What handles it

No certification claim covers this compound yet.

Nitrate

Comes from the source

Below EPA’s limits

0.82ppm

Highest sample; found in 12 of 13

2026 average: 0.77 ppm

The highest sample, in 2026, was 0.82 ppm, below EPA’s legal limit of 10 ppm. That was also the latest year on file, and its two samples averaged 0.77 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.99 ppm, in 2017.

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

0.28ppm

Highest yearly average, 2021 to 2024

Averaged by year, the highest was 0.28 ppm, in 2024, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.28 ppm. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.46 ppm, in 2012.

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

4.9ppb

Highest yearly average, 2021 to 2025

2025, one sample: 1.9 ppb

Averaged by year, the highest was 4.9 ppb, in 2022, below EPA’s legal limit of 100 ppb. In 2025, the latest year on file, its one sample was 1.9 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 4.2 ppb, in 2016.

What handles it

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

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. Total trihalomethanes (TTHM), haloacetic acids (HAA5), nitrate, fluoride, chromium (total), arsenic and uranium results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Comanche Harbor & Port Ocall’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 Jan. 28, 2020 to Aug. 19, 2026.

Testing your own tap

Comanche Harbor & Port Ocall’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 Comanche Harbor & Port Ocall serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

Texas Institute for Applied Environmental Research (TIAER)
Stephenville, TX · about 24 miles
Certified for bacteria
(254) 968-9570
Tarrant County Public Health Laboratory
Fort Worth, TX · about 36 miles
Certified for bacteria
(817) 321-4758
Pace Analytical Services, LLC -Dallas TX
Fort Worth, TX · about 44 miles
Certified for bacteria
(817) 616-5030

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