Thompson Special Services District, UT
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2023-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
About Thompson Special Services District
Thompson Special Services District serves about 85 people through 55 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Grand County, Utah. EPA system ID: UTAH10004; phone on file: 435-220-0359. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
Against the period ending 2024 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Thompson Special Services District is 1.1 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2016 | 1.1 ppb |
Where this result ranks
Of the 521 Utah systems with a lead result, the median latest reading is 1.71 ppb; 8 are over 15 ppb right now and 27 have gone over at some point. Thompson Special Services District's reported as 0 (not detected) sits at the 3rd percentile in Utah and the 8th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
5 other systems share Grand County; 4 of them have a higher latest lead result than Thompson Special Services District. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Moab City | 9,000 | 3.1 ppb |
| Grand Water And Sewer Agency | 4,099 | 0.6 ppb |
| Sorrel River Ranch Water | 260 | 0 (not detected) |
| Arches National Park Hq | 116 | 1.71 ppb |
| Day Star Adventist Academy | 35 | 1.1 ppb |
What to do in your house
Look up your address in Thompson Special Services District's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Thompson Special Services District whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. What a 90th-percentile result does and does not tell you: how to read a lead result. Small systems behave differently: why small systems go over more often.