Clarks Lookout, MT
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2026-2026). 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 Clarks Lookout
Clarks Lookout serves about 62 people through 43 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Beaverhead County, Montana. EPA system ID: MT0004249; phone on file: 480-241-9541. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is down 49 ppb from 49 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Clarks Lookout is 49 ppb across 5 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2025 | 49 ppb over 15 |
| 2022 | 0 (not detected) |
| 2019 | 2 ppb |
| 2016 | 0 (not detected) |
How Clarks Lookout 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. Clarks Lookout's reported as 0 (not detected) sits at the 11th percentile in Montana and the 5th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Beaverhead County
8 other systems share Beaverhead County; 6 of them have a higher latest lead result than Clarks Lookout. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Dillon City Of | 4,300 | 3 ppb |
| Keller Subdivision No 2 Hoa | 300 | 2 ppb |
| Hildreth Subdivision No 2 | 300 | 3 ppb |
| Lima Town Of | 279 | 0 (not detected) |
| Hildreth Subdivision No 3 | 128 | 0 (not detected) |
| Western Mobile Village Dillon | 75 | 4 ppb |
| Skyline Tr Ct And Rv Park | 75 | 2 ppb |
| Beaverhead Jackson Water And Sewer Dist | 58 | 7 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Dillon, 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 Clarks Lookout 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. More in what a past exceedance means today.