Bynum - Teton Co W & S District, MT
Lead detected, under the action levels
Latest 90th-percentile lead: 3 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.
Bynum - Teton Co W & S District at a glance
Bynum - Teton Co W & S District serves about 100 people through 30 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: MT0004778; phone on file: 406-469-2211. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Bynum - Teton Co W & S District's lead record
Against the period ending 2024 (3 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Bynum - Teton Co W & S District is 3 ppb across 5 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 3 ppb |
| 2024 | 3 ppb |
| 2018 | 3 ppb |
| 2017 | 1 ppb |
| 2016 | 2 ppb |
How Bynum - Teton Co W & S 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. Bynum - Teton Co W & S District's 3 ppb sits at the 82nd percentile in Montana and the 81st nationally (higher means more lead).
Nearby utilities
8 other systems share Teton County; 3 of them have a higher latest lead result than Bynum - Teton Co W & S 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 |
| Tri County Water District | 470 | 1 ppb |
| Dutton Town Of | 338 | 27 ppb |
| Power Teton County Water Dist | 205 | 5 ppb |
| New Rockport Colony Inc | 160 | 0 (not detected) |
| Rockport Colony | 92 | 2 ppb |
| Miller Colony | 84 | 1 ppb |
Next steps for Bynum, MT
Test your own tap with a certified lab first-draw sample; Bynum, 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 Bynum - Teton Co W & S 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. The action level is dropping - the 10 ppb rule from 2027.