Encampment Trail, MT
Lead reported as not detected
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 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.
Encampment Trail at a glance
Encampment Trail serves about 100 people through 71 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Madison County, Montana. EPA system ID: MT0004916; phone on file: 406-577-4936. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
That is down 12 ppb from 12 ppb in the period ending 2026. The highest 90th-percentile result EPA holds for Encampment Trail is 12 ppb across 9 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2026 | 12 ppb over 10 |
| 2025 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2017 | 0 (not detected) |
| 2016 | 0 (not detected) |
| 2016 | 0 (not detected) |
How Encampment Trail 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. Encampment Trail's reported as 0 (not detected) sits at the 20th percentile in Montana and the 9th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
10 other systems share Madison County; 8 of them have a higher latest lead result than Encampment Trail. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Big Sky County Water And Sewer Dist 363 | 4,132 | 4.84 ppb |
| Virginia City Water Dept | 1,500 | 0 (not detected) |
| Ennis Town Of | 1,400 | 0 (not detected) |
| Sheridan Town Of | 632 | 2 ppb |
| Andesite Ridge Water System | 450 | 3 ppb |
| Twin Bridges Town Of | 424 | 2 ppb |
| Mt Moonlight Basin | 355 | 0.28 ppb |
| Lower Pioneer Mountain Water System | 350 | 1 ppb |
| Valley Garden Golf Village Hoa | 195 | 1 ppb |
| Lone View Ridge Water System | 37 | 1 ppb |
What to do in your house
Look up your address in Encampment Trail'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 Encampment Trail 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. A zero today does not rule out a jump later - the rules are tightening in 2027.