Wye Area Water System, 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.
About Wye Area Water System
Wye Area Water System serves about 512 people through 183 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Missoula County, Montana. EPA system ID: MT0004107; phone on file: 406-531-6472. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2024 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Wye Area Water System is 1 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1 ppb |
| 2024 | 1 ppb |
| 2022 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2016 | 1 ppb |
How Wye Area Water System 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. Wye Area Water System's 1 ppb sits at the 58th percentile in Montana and the 53rd nationally (higher means more lead).
Nearby utilities
80 other systems share Missoula County; 23 of them have a higher latest lead result than Wye Area Water System. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Missoula Water | 68,200 | 2 ppb |
| Lolo Water And Sewer Dist | 3,315 | 2 ppb |
| Seeley Lake Water District | 1,575 | 4 ppb |
| El Mar Estates Msla Co Water | 1,350 | 1 ppb |
| Westview Mobile Home Park | 947 | 1 ppb |
| Phantom Hills Water System | 810 | 3 ppb |
| Travois Village Mobile Park | 702 | 2 ppb |
| Grant Creek Water Users Association Inc | 380 | 0 (not detected) |
| Katoonah Lodges | 258 | 3 ppb |
| Sorrel Springs Hoa | 250 | 1 ppb |
Next steps for Missoula, MT
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 Wye Area Water System 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. The lead result guide covers how utilities pick the homes they sample. The action level is dropping - the 10 ppb rule from 2027.