Tri County Water District, MT
Exceeded the action level in the past
Latest 90th-percentile lead: 1 ppb (monitoring period 2024-2024). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
About Tri County Water District
Tri County Water District serves about 470 people through 177 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 Teton County, Montana. EPA system ID: MT0002912. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
That is down 79 ppb from 80 ppb in the period ending 2023. The highest 90th-percentile result EPA holds for Tri County Water District is 80 ppb across 5 monitoring periods, 2 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 1 ppb |
| 2023 | 80 ppb over 15 |
| 2021 | 80 ppb over 15 |
| 2020 | 3 ppb |
| 2019 | 6 ppb |
How Tri County Water District compares
Of the 753 Montana systems with a lead result, the median latest reading is 1 ppb; 5 are over 15 ppb right now and 28 have gone over at some point. Tri County Water District's 1 ppb sits at the 58th percentile in Montana and the 53rd nationally (higher means more lead).
Neighbouring systems
8 other systems share Teton County; 5 of them have a higher latest lead result than Tri County Water District. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Choteau City Of | 1,691 | 4 ppb |
| Fairfield Town Of | 718 | 1 ppb |
| Dutton Town Of | 338 | 27 ppb |
| Power Teton County Water Dist | 205 | 5 ppb |
| New Rockport Colony Inc | 160 | 0 (not detected) |
| Bynum - Teton Co W & S District | 100 | 3 ppb |
| Rockport Colony | 92 | 2 ppb |
| Miller Colony | 84 | 1 ppb |
Next steps for Power, MT
Test your own tap with a certified lab first-draw sample; Power, MT may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Tri County Water 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. Why an old exceedance still matters: over the limit before, under it now.