Thompson Special Services District
What EPA’s and Utah’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
- 85 people
- Connections
- 55
- Water source
- Groundwater
- Based in
- Moab, UT
- County
- Grand
- Owner
- Local government
The ZIP code it serves
The short answer
Nothing in EPA’s and Utah’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. 2 health-based violations since 2016.
What was found
Nitrate: Utah’s own results, samples taken from Aug. 26, 2020 to Dec. 29, 2025.
Total trihalomethanes (TTHM) and haloacetic acids (HAA5): EPA’s compliance monitoring file, samples taken from Aug. 22, 2012 to Aug. 26, 2019. Newer results are in the utility’s annual water quality report.
Below EPA’s limits3
Total trihalomethanes (TTHM)
Forms or is added in treatment
29.9ppb
Highest yearly average, 2012 to 2019
2019, one sample: 10.7 ppb
Averaged by year, the highest was 29.9 ppb, in 2018, below EPA’s legal limit of 80 ppb. In 2019, the latest year on file, its one sample was 10.7 ppb.
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
5.0ppb
Highest yearly average, 2012 to 2019
2019, one sample: 3.0 ppb
Averaged by year, the highest was 5.0 ppb, in 2018, below EPA’s legal limit of 60 ppb. In 2019, the latest year on file, its one sample was 3.0 ppb.
What handles it
No certification claim covers this compound yet.
Nitrate
Comes from the source
0.17ppm
Highest sample; found in 1 of 6
2025: not found
The highest sample, in 2024, was 0.17 ppm, below EPA’s legal limit of 10 ppm. In 2025, the latest year on file, it wasn’t found in its one sample.
What handles it
- NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
- NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
One compound tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Lead
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 | Aug. 2, 2023 | — | Resolved |
| Groundwater Rule | A significant problem found in a state inspection was not fixed on time.EPA: Failure To Address Deficiency | Aug. 2, 2023 | — | Resolved |
| Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 16 monitoring or reporting violations not shown. | ||||
What this report can’t tell you
Everything else. Nitrate results here are Utah’s own from 2020 on, with EPA’s national file for 2012 to 2019. Total trihalomethanes (TTHM) and haloacetic acids (HAA5) come from EPA’s file alone, which ends in 2019. Thompson Special Services District’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; Utah’s results run from Aug. 26, 2020 to Dec. 29, 2025; EPA’s compliance samples are from Aug. 22, 2012 to Aug. 26, 2019.
Testing your own tap
No lab Utah certifies is within 75 miles of the area Thompson Special Services District serves on the state’s list. Some take samples by mail; the state’s page lists them all.
All 60 certified labs for UtahSources
- EPA UCMR 5 occurrence data, file of Oct. 15, 2026
- EPA SDWA bulk download (SDWIS federal data), 2026 Q3
- Utah Department of Environmental Quality, Division of Drinking Water, results from Jan. 3, 2020 to Oct. 1, 2026, read Oct. 8, 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 UTAH10004. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Nothing here is above a health goalIn EPA’s and Utah’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 reportThompson Special Services District must send you a water quality report every year. It covers contaminants this page does not show, and has newer results than EPA’s national file for the ones here that come from it.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