North Central Texas Municipal Water Auth
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
- 132 people
- Connections
- 47
- Water source
- Surface water
- Based in
- Munday, TX
- County
- Knox
- Owner
- Local government
The ZIP code it serves
The short answer
2 results are above the health goal. The worst: Arsenic, above the health goal. 1 health-based violation since 2016.
What handles itWhat was found
Arsenic, uranium, nitrate, haloacetic acids (HAA5), total trihalomethanes (TTHM), fluoride and chromium (total): Texas’s own results, samples taken from March 17, 2020 to Aug. 25, 2026, with EPA’s 2012 to 2019 file for earlier years.
Above the health goal2
Arsenic
Comes from the source
1.9ppb
Highest yearly average, 2020 to 2026
2026 average: 1.7 ppb
Averaged by year, the highest was 1.9 ppb, in 2024: below EPA’s legal limit of 10 ppb, but above its health goal of zero. Its highest single sample was 2.6 ppb. In 2026, the latest year on file, its three samples averaged 1.7 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 3.9 ppb, in 2014.
What handles it
- NSF/ANSI 58 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
- NSF/ANSI 53 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
Uranium
Comes from the source
4.5ppb
Highest yearly average, 2020 to 2025
2025 average: 1.1 ppb
Averaged by year, the highest was 4.5 ppb, in 2024: below EPA’s legal limit of 30 ppb, but above its health goal of zero. In 2025, the latest year on file, its two samples averaged 1.1 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 1.1 ppb, in 2016.
What handles it
- NSF/ANSI 58 look for “Uranium”
Below EPA’s limits5
Nitrate
Comes from the source
10.1ppm
Highest sample; found in 84 of 84
2026 average: 2.2 ppm
The highest sample, in 2023, was 10.1 ppm, which EPA rounds to 10 ppm to compare: at its legal limit of 10 ppm, not above it. In 2026, the latest year on file, its 10 samples averaged 2.2 ppm. EPA recorded no violation for nitrate at this utility since 2020. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 5.1 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
40.4ppb
Highest yearly average, 2020 to 2026
2026, one sample: 24.6 ppb
Averaged by year, the highest was 40.4 ppb, in 2024, below EPA’s legal limit of 60 ppb. In 2026, the latest year on file, its one sample was 24.6 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 47 ppb, in 2013.
What handles it
No certification claim covers this compound yet.
Total trihalomethanes (TTHM)
Forms or is added in treatment
22.8ppb
Highest yearly average, 2020 to 2026
2026, one sample: 14.3 ppb
Averaged by year, the highest was 22.8 ppb, in 2024, below EPA’s legal limit of 80 ppb. In 2026, the latest year on file, its one sample was 14.3 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 134 ppb, in 2014, and EPA recorded violations in 2014 and 2015.
What handles it
- NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
- NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”
Fluoride
Forms or is added in treatment
0.66ppm
Highest yearly average, 2020 to 2026
2026 average: 0.26 ppm
Averaged by year, the highest was 0.66 ppm, in 2021, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.81 ppm. In 2026, the latest year on file, its three samples averaged 0.26 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.9 ppm, in 2017.
What handles it
- NSF/ANSI 58 look for “Fluoride Reduction”
- NSF/ANSI 53 look for “Fluoride”
Chromium (total)
Comes from the source
2.6ppb
Highest yearly average, 2020 to 2026
2026 average: 0.33 ppb
Averaged by year, the highest was 2.6 ppb, in 2024, below EPA’s legal limit of 100 ppb. Its highest single sample was 4.2 ppb. In 2026, the latest year on file, its three samples averaged 0.33 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 8.0 ppb, in 2014.
What handles it
- NSF/ANSI 58 look for “Chromium (Hexavalent) Reduction”
- NSF/ANSI 53 look for “Chromium Reduction”
One compound tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Lead
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.”
- NSF/ANSI 53
Claim: Arsenic (Pentavalent)<=50 ppb Reduction
For: Arsenic
Other certifiers’ wording: Arsenic (III) (50 ppb influent level)
- NSF/ANSI 58
Claims: Arsenic (Pentavalent)<=50 ppb Reduction, Uranium
For: Arsenic, Uranium
Other certifiers’ wording: Arsenic (Pentavalent)<=300 ppb Reduction; Arsenic (V) (300 ppb influent level)
At the tap, or for the whole house?
These come with the water itself, so a whole-house system certified for the same claims treats every tap and shower. A filter at the tap treats drinking water for much less. 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
Countertop reverse osmosis
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 4, 2026
Certified for: Arsenic
Aquasana SmartFlow Reverse Osmosis (AQ-SFRO2)
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Brondell Capella RC250 Reverse Osmosis System
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Violations since 2016
| Contaminant or rule | Type | Period | Measured | Status |
|---|---|---|---|---|
| Chlorite | The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average | Aug. 1, 2024 to Aug. 31, 2024 | 1.1 MG/L | Resolved |
| Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 14 monitoring or reporting violations not shown. | ||||
What this report can’t tell you
Everything else. Arsenic, uranium, nitrate, haloacetic acids (HAA5), total trihalomethanes (TTHM), fluoride and chromium (total) results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. North Central Texas Municipal Water Auth’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 March 17, 2020 to Aug. 25, 2026.
Testing your own tap
The 2 labs Texas certifies closest to the area North Central Texas Municipal Water Auth serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Abilene–Taylor County Public Health District
Abilene, TX · about 60 miles
Certified for bacteria
Sweetwater -Nolan County Health Department
Sweetwater, TX · about 73 miles
Certified for bacteria
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
- EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, file of Feb. 5, 2024
- Certified labs: TCEQ, drinking water laboratories approved for public water system samples, read Oct. 10, 2026; distances from the Census 2020 ZIP code tabulation area gazetteer
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID TX1380009. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Read up on the 2 results above a lineWhat each one does to health, where it comes from, and the certification claim that addresses it.Start with Arsenic
- Get the utility’s own reportNorth Central Texas Municipal Water Auth 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
- Compare certified filtersWhat the filters certified for these results cost over five years, cartridges included.Compare five-year costs