Three Forks City Of, MT
Lead detected, under the action levels
Latest 90th-percentile lead: 2 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 Three Forks City Of
Three Forks City Of serves about 1,900 people through 965 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Gallatin County, Montana. EPA system ID: MT0000343; phone on file: 406-285-3431. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
Against the period ending 2024 (2 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Three Forks City Of is 2 ppb across 6 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2 ppb |
| 2024 | 2 ppb |
| 2022 | 2 ppb |
| 2021 | 2 ppb |
| 2019 | 2 ppb |
| 2016 | 2 ppb |
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. Three Forks City Of's 2 ppb sits at the 75th percentile in Montana and the 72nd nationally (higher means more lead).
Neighbouring systems
59 other systems share Gallatin County; 11 of them have a higher latest lead result than Three Forks City Of. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Bozeman City Of | 56,000 | 1.6 ppb |
| Belgrade City Of | 10,460 | 1.79 ppb |
| West Yellowstone Town Of | 9,899 | 1.25 ppb |
| North Star Zoot Water | 4,323 | 3 ppb |
| River Rock County Water And Sewer Dist | 4,200 | 2.81 ppb |
| Rae Water And Sewer Dist 313 | 2,325 | 2.08 ppb |
| Manhattan Town Of | 1,800 | 2 ppb |
| Valley Grove Subdivision | 825 | 2.04 ppb |
| Landmark Subdivision | 750 | 0 (not detected) |
| Elk Grove Water | 672 | 4.38 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Three Forks, 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 Three Forks City Of 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. Systems that went over once often dip back under; here is what that means.