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Caro WSC

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
2,412 people
Connections
1,009
Water source
Groundwater
Based in
Nacogdoches, TX
County
Nacogdoches
Owner
Local government
The 3 ZIP codes it serves

75760, 75964, 75965

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), nitrate, haloacetic acids (HAA5), chromium (total), fluoride, arsenic and uranium: Texas’s own results, samples taken from May 7, 2020 to May 13, 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

55.7ppb

Highest yearly average, 2020 to 2026

2026, one sample: 17.4 ppb

Averaged by year, the highest was 55.7 ppb, in 2022, below EPA’s legal limit of 80 ppb. In 2026, the latest year on file, its one sample was 17.4 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 17.8 ppb, in 2016.

What handles it

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

Nitrate

Comes from the source

Below EPA’s limits

4.7ppm

Highest sample; found in 20 of 21

2026 average: 0.14 ppm

The highest sample, in 2023, was 4.7 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its three samples averaged 0.14 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.26 ppm, in 2013.

What handles it

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

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

13.5ppb

Highest yearly average, 2020 to 2026

2026, one sample: 4.4 ppb

Averaged by year, the highest was 13.5 ppb, in 2025, below EPA’s legal limit of 60 ppb. In 2026, the latest year on file, its one sample was 4.4 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 9.2 ppb, in 2016.

What handles it

No certification claim covers this compound yet.

Chromium (total)

Comes from the source

Below EPA’s limits

4.6ppb

Highest yearly average, 2020 to 2026

2026, one sample: 1.4 ppb

Averaged by year, the highest was 4.6 ppb, in 2020, below EPA’s legal limit of 100 ppb. In 2026, the latest year on file, its one sample was 1.4 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 2.5 ppb, in 2017.

What handles it

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.17ppm

Highest yearly average, 2020 to 2026

2026 average: 0.077 ppm

Averaged by year, the highest was 0.17 ppm, in 2023, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.32 ppm. In 2026, the latest year on file, its three samples averaged 0.077 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.12 ppm, in 2014.

What handles it

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

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—Unaddressed
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 67 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), nitrate, haloacetic acids (HAA5), chromium (total), fluoride, arsenic and uranium results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Caro WSC’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 May 7, 2020 to May 13, 2026.

Testing your own tap

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

  • Eastex Environmental Lab, Inc.-Nacogdoches

    Nacogdoches, TX · about 18 miles

    Certified for bacteria

    (936) 569-8879

  • Southern Petroleum Laboratories (SPL), Inc. (FKA Ana-Lab Corporation)

    Kilgore, TX · about 47 miles

    Certified for bacteria, lead and copper

    (903) 984-0551

  • Analytical Environmental Labs

    Tyler, TX · about 49 miles

    Certified for bacteria

    (903) 509-8700

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 TX1740007. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Nacogdoches County

All Texas utilities

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