Swift 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
- 2,547 people
- Connections
- 1,070
- Water source
- Groundwater
- Based in
- Nacogdoches, TX
- County
- Nacogdoches
- Owner
- Local government
The ZIP code it serves
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), haloacetic acids (HAA5), chromium (total), fluoride, nitrate, arsenic and uranium: Texas’s own results, samples taken from Aug. 18, 2020 to Sept. 23, 2026, with EPA’s 2012 to 2019 file for earlier years.
Below EPA’s limits5
Total trihalomethanes (TTHM)
Forms or is added in treatment
47.8ppb
Highest yearly average, 2020 to 2026
2026 average: 37.6 ppb
Averaged by year, the highest was 47.8 ppb, in 2020, below EPA’s legal limit of 80 ppb. Its highest single sample was 60.4 ppb. In 2026, the latest year on file, its two samples averaged 37.6 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 46 ppb, in 2018.
What handles it
- NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
- NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”
Haloacetic acids (HAA5)
Forms or is added in treatment
33ppb
Highest yearly average, 2020 to 2026
2026 average: 30.1 ppb
Averaged by year, the highest was 33 ppb, in 2020, below EPA’s legal limit of 60 ppb. Its highest single sample was 35 ppb. In 2026, the latest year on file, its two samples averaged 30.1 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 28.3 ppb, in 2016.
What handles it
No certification claim covers this compound yet.
Chromium (total)
Comes from the source
5.5ppb
Highest yearly average, 2020 to 2026
2026: not found
Averaged by year, the highest was 5.5 ppb, in 2020, below EPA’s legal limit of 100 ppb. Its highest single sample was 6.8 ppb. In 2026, the latest year on file, it wasn’t found in any of its four samples. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 4.5 ppb, in 2014.
What handles it
- NSF/ANSI 58 look for “Chromium (Hexavalent) Reduction”
- NSF/ANSI 53 look for “Chromium Reduction”
Fluoride
Forms or is added in treatment
0.13ppm
Highest yearly average, 2020 to 2026
2026 average: 0.12 ppm
Averaged by year, the highest was 0.13 ppm, in 2021, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.15 ppm. In 2026, the latest year on file, its four samples averaged 0.12 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.22 ppm, in 2012.
What handles it
- NSF/ANSI 58 look for “Fluoride Reduction”
- NSF/ANSI 53 look for “Fluoride”
Nitrate
Comes from the source
0.062ppm
Highest sample; found in 35 of 35
2026 average: 0.036 ppm
The highest sample, in 2022, was 0.062 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its five samples averaged 0.036 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.06 ppm, in 2012.
What handles it
- NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
- NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
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 rule | Type | Period | Measured | Status |
|---|---|---|---|---|
| Groundwater Rule | A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency | Oct. 2, 2021 | — | Resolved |
| Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 3 monitoring or reporting violations not shown. | ||||
What this report can’t tell you
Everything else. Total trihalomethanes (TTHM), haloacetic acids (HAA5), chromium (total), fluoride, nitrate, arsenic and uranium results here are Texas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Swift 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 Aug. 18, 2020 to Sept. 23, 2026.
Testing your own tap
The 3 labs Texas certifies closest to the area Swift 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 · under a mile
Certified for bacteria
Southern Petroleum Laboratories (SPL), Inc. (FKA Ana-Lab Corporation)
Kilgore, TX · about 61 miles
Certified for bacteria, lead and copper
Analytical Environmental Labs
Tyler, TX · about 67 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 TX1740019. Rebuilt from EPA data on Oct. 18, 2026.
Towns it serves
Also in Nacogdoches County
- City of Nacogdoches50,226
- D & M WSC7,280
- Appleby WSC5,745
- Melrose WSC3,143
- Lilly Grove SUD2,435
- Caro WSC2,412
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 reportSwift WSC 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