Crwa Lake Dunlap WTP
What EPA’s and Texas’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals, plus violations since 2016, with the certification that handles each result.
- Serves
- 14 people
- Connections
- 83,028
- Water source
- Surface water
- Based in
- New Braunfels, TX
- County
- Guadalupe
- Owner
- Local government
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, not everything. 9 health-based violations since 2016.
What was found
Haloacetic acids (HAA5), total trihalomethanes (TTHM), nitrate, fluoride, arsenic, chromium (total) and uranium: Texas’s own results, samples taken from Jan. 24, 2020 to Aug. 18, 2026, with EPA’s 2012 to 2019 file for earlier years.
Below EPA’s limits4
Haloacetic acids (HAA5)
Forms or is added in treatment
48.3ppb
Highest yearly average, 2020 to 2026
2026 average: 27.1 ppb
Averaged by year, the highest was 48.3 ppb, in 2022, below EPA’s legal limit of 60 ppb. Its highest single sample was 71.7 ppb. In 2026, the latest year on file, its three samples averaged 27.1 ppb. EPA recorded no violation for haloacetic acids (HAA5) at this utility since 2020. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 22.6 ppb, in 2016.
What handles it
No certification claim covers this compound yet.
Total trihalomethanes (TTHM)
Forms or is added in treatment
59.2ppb
Highest yearly average, 2020 to 2026
2026 average: 51.4 ppb
Averaged by year, the highest was 59.2 ppb, in 2022, below EPA’s legal limit of 80 ppb. Its highest single sample was 68.4 ppb. In 2026, the latest year on file, its three samples averaged 51.4 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 55.8 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
2.0ppm
Highest sample; found in 7 of 7
2026, one sample: 1.4 ppm
The highest sample, in 2021, was 2.0 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its one sample was 1.4 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 2.0 ppm, in 2018.
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
0.24ppm
Highest yearly average, 2020 to 2026
2026: not found
Averaged by year, the highest was 0.24 ppm, in 2020, below EPA’s legal limit of 4.0 ppm. In 2026, the latest year on file, it wasn’t found in its one sample. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.25 ppm, in 2013.
What handles it
- NSF/ANSI 58 look for “Fluoride Reduction”
- NSF/ANSI 53 look for “Fluoride”
3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Arsenic
- Chromium (total)
- Uranium
Violations since 2016
| Contaminant or rule | Type | Period | Measured | Status |
|---|---|---|---|---|
| Bromate | The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average | Oct. 1, 2019 to Dec. 31, 2019 | 0.013 MG/L | Resolved |
| Bromate | The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average | July 1, 2019 to Sept. 30, 2019 | 0.014 MG/L | Resolved |
| Bromate | The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average | April 1, 2019 to June 30, 2019 | 0.014 MG/L | Resolved |
| Long Term 2 Enhanced Surface Water Treatment Rule | Required treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR) | April 1, 2019 to April 30, 2019 | — | Resolved |
| Long Term 2 Enhanced Surface Water Treatment Rule | Required treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR) | March 1, 2019 to March 31, 2019 | — | Resolved |
| Long Term 2 Enhanced Surface Water Treatment Rule | Required treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR) | Feb. 1, 2019 to Feb. 28, 2019 | — | Resolved |
| Long Term 2 Enhanced Surface Water Treatment Rule | Required treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR) | Jan. 1, 2019 to Jan. 31, 2019 | — | Resolved |
| Long Term 2 Enhanced Surface Water Treatment Rule | Required treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR) | Dec. 1, 2018 to Dec. 31, 2018 | — | Resolved |
| Long Term 2 Enhanced Surface Water Treatment Rule | Required treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR) | Nov. 1, 2018 to Nov. 30, 2018 | — | 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. Haloacetic acids (HAA5), total trihalomethanes (TTHM), nitrate, fluoride, arsenic, chromium (total) and uranium results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Crwa Lake Dunlap WTP’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. 24, 2020 to Aug. 18, 2026.
Testing your own tap
No lab Texas certifies is within 75 miles of the area Crwa Lake Dunlap WTP serves on the state’s list. Some take samples by mail; the state’s page lists them all.
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
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID TX0940091. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Nothing here is above a health goalIn EPA’s and Texas’s records for this utility. They don’t cover everything, which is why the next step matters.Every contaminant TapBuff tracks
- Get the utility’s own reportCrwa Lake Dunlap WTP 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
- Decide if you want a filter at allA filter for taste or chlorine is a preference, not a need. The standards say what each kind can do.NSF/ANSI standards, decoded