Trestle Creek I And Ii, MT
Lead detected, under the action levels
Latest 90th-percentile lead: 1 ppb (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. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
Who runs the water here
Trestle Creek I And Ii serves about 110 people through 84 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Mineral County, Montana. EPA system ID: MT0004423; phone on file: 406-544-6815. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2022 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Trestle Creek I And Ii is 3 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1 ppb |
| 2022 | 1 ppb |
| 2019 | 3 ppb |
| 2016 | 0 (not detected) |
Against other Montana systems
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. Trestle Creek I And Ii's 1 ppb sits at the 51st percentile in Montana and the 51st nationally (higher means more lead).
Other water systems in Mineral County
8 other systems share Mineral County; 1 of them has a higher latest lead result than Trestle Creek I And Ii. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Superior Town Of | 1,100 | 1 ppb |
| Alberton Town Of | 495 | 4 ppb |
| Shyrock Motorcoach Community | 150 | - |
| West Mountain Estates | 125 | 0 (not detected) |
| High Country Mhp Llc | 76 | 0 (not detected) |
| Deer Lick Subdivision Water District | 70 | 1 ppb |
| Cougar Meadows | 45 | 0 (not detected) |
| Old Mill Peninsula Hoa | 40 | 1 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Missoula, 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 Trestle Creek I And Ii 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. Why sampled homes are the worst-case ones is in the guide to reading the number. Size matters more than most people expect: small vs large water systems.