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Concan 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
1,488 people
Connections
496
Water source
Groundwater influenced by surface water
Based in
Concan, TX
County
Uvalde
Owner
Local government
The ZIP code it serves

78838

The short answer

2 results are above the health goal. The worst: Lead, above the health goal. 4 health-based violations since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 1996 to 2026.

Uranium, total trihalomethanes (TTHM), nitrate, haloacetic acids (HAA5), fluoride, arsenic and chromium (total): Texas’s own results, samples taken from Feb. 20, 2020 to May 20, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal2

Lead

Comes from pipes, often your own

Above the health goal

1.1ppb

90th percentile, 2026

In the latest period, 9 in 10 homes sampled were at or below 1.1 ppb, below EPA’s action level of 15 ppb. The action level drops to 10 ppb on Nov. 1, 2027. EPA’s health goal for lead is zero.

What handles it

Uranium

Comes from the source

Above the health goal

1.3ppb

Highest yearly average, 2020 to 2024

2024, one sample: 1.2 ppb

Averaged by year, the highest was 1.3 ppb, in 2021: below EPA’s legal limit of 30 ppb, but above its health goal of zero. In 2024, the latest year on file, its one sample was 1.2 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 1.2 ppb, in 2018.

What handles it

Below EPA’s limits4

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

28.5ppb

Highest yearly average, 2020 to 2026

2026 average: 19.3 ppb

Averaged by year, the highest was 28.5 ppb, in 2025, below EPA’s legal limit of 80 ppb. Its highest single sample was 50.4 ppb. In 2026, the latest year on file, its two samples averaged 19.3 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 28.1 ppb, in 2015.

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

2.3ppm

Highest sample; found in 24 of 24

2025 average: 1.0 ppm

The highest sample, in 2021, was 2.3 ppm, below EPA’s legal limit of 10 ppm. In 2025, the latest year on file, its four samples averaged 1.0 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 2.9 ppm, in 2019.

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

11.3ppb

Highest yearly average, 2020 to 2026

2026 average: 6.0 ppb

Averaged by year, the highest was 11.3 ppb, in 2025, below EPA’s legal limit of 60 ppb. Its highest single sample was 22.3 ppb. In 2026, the latest year on file, its two samples averaged 6.0 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 11.4 ppb, in 2012.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.63ppm

Highest yearly average, 2020 to 2025

2025: not found

Averaged by year, the highest was 0.63 ppm, in 2024, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 1.1 ppm. In 2025, the latest year on file, it wasn’t found in any of its two samples. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.36 ppm, in 2018.

What handles it

2 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Chromium (total)

What handles it

A certification covers specific claims, not a whole standard. Look for these claims on the certifier’s listing, not the box. Wording varies a little: NSF writes “Lead Reduction,” WQA just “Lead.”

At the tap, or for the whole house?

Lead and copper usually come from pipes and fixtures inside or near your home. A whole-house system sits where water enters, so it cannot catch what your own plumbing adds after it. For those, the filter that counts is the one at the tap. How whole-house systems compare.

Filters with those claims on a certifier’s listing

Disclosure: TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money

Compare five-year costs

The best water filters for lead, ranked

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Interim Enhanced Surface Water Treatment RuleToo many readings in a month showed cloudiness above the filtration standard.EPA: Monthly Turbidity Exceed (Enhanced SWTR)May 1, 2023 to May 31, 2023—Resolved
Interim Enhanced Surface Water Treatment RuleToo many readings in a month showed cloudiness above the filtration standard.EPA: Monthly Turbidity Exceed (Enhanced SWTR)Nov. 1, 2021 to Nov. 30, 2021—Resolved
Interim Enhanced Surface Water Treatment RuleOne cloudiness reading was above the maximum allowed.EPA: Single Turbidity Exceed (Enhanced SWTR)Oct. 1, 2021 to Oct. 31, 2021—Resolved
Interim Enhanced Surface Water Treatment RuleToo many readings in a month showed cloudiness above the filtration standard.EPA: Monthly Turbidity Exceed (Enhanced SWTR)Oct. 1, 2021 to Oct. 31, 2021—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 6 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Uranium, total trihalomethanes (TTHM), nitrate, haloacetic acids (HAA5), fluoride, arsenic and chromium (total) results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Concan 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 Feb. 20, 2020 to May 20, 2026.

Testing your own tap

Concan 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 lab Texas certifies closest to the area Concan WSC serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • San Antonio Testing Laboratory, LLC

    San Antonio, TX · about 74 miles

    Certified for bacteria, lead and copper

    (210) 229-9920

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 TX2320032. Rebuilt from EPA data on Oct. 18, 2026.

Also in Uvalde County

All Texas utilities

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