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Derby Ing

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
174 people
Connections
58
Water source
Groundwater
Based in
Barker, TX
County
Frio
Owner
Local government
The 2 ZIP codes it serves

78017, 78061

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

Nitrate: Texas’s own results, samples taken from Nov. 12, 2020 to Dec. 22, 2021, with EPA’s 2012 to 2019 file for earlier years.

Fluoride, arsenic and chromium (total): EPA’s compliance monitoring file, samples taken from June 18, 2013 to June 18, 2013. Newer results are in the utility’s annual water quality report.

Below EPA’s limits1

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.38ppm

Highest yearly average, 2013

Averaged by year, the highest was 0.38 ppm, in 2013, below EPA’s legal limit of 4.0 ppm. That is the only year on file.

What handles it

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

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. 358 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Nitrate results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Fluoride, arsenic and chromium (total) come from EPA’s file alone, which ends in 2019. Derby Ing’s own annual report, which it must send you every year, has newer results for those and 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 Nov. 12, 2020 to Dec. 22, 2021; EPA’s compliance samples are from June 18, 2013 to June 18, 2013.

Testing your own tap

Derby Ing’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 Derby Ing 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 58 miles

    Certified for bacteria, lead and copper

    (210) 229-9920

  • San Antonio Metropolitan Health District

    San Antonio, TX · about 58 miles

    Certified for bacteria

    (210) 207-8887

  • Alamo Analytical Laboratories, Ltd.

    San Antonio, TX · about 65 miles

    Certified for lead and copper

    (210) 340-8121

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 TX0820016. Rebuilt from EPA data on Oct. 18, 2026.

Also in Frio County

All Texas utilities

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