Jefferson Hills Wua, MT
Lead detected, under the action levels
Latest 90th-percentile lead: 1 ppb (monitoring period 2022-2024). 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.
Jefferson Hills Wua at a glance
Jefferson Hills Wua serves about 780 people through 72 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Jefferson County, Montana. EPA system ID: MT0002978; phone on file: 406-422-9194. 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 2018 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Jefferson Hills Wua is 1 ppb across 2 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 1 ppb |
| 2018 | 0 (not detected) |
How Jefferson Hills Wua 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. Jefferson Hills Wua's 1 ppb sits at the 59th percentile in Montana and the 53rd nationally (higher means more lead).
Neighbouring systems
13 other systems share Jefferson County; 9 of them have a higher latest lead result than Jefferson Hills Wua. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Whitehall Town Of | 1,500 | 3 ppb |
| Boulder City Of | 1,400 | 0 (not detected) |
| Saddle Mountain Corp Clancy | 350 | 6 ppb |
| Forest Park Water Users Association | 323 | 15 ppb |
| Blue Sky Heights Wua Clancy | 250 | 0 (not detected) |
| Basin County Water And Sewer Dist | 200 | 0 (not detected) |
| Hangmans Tree Wua | 158 | 4 ppb |
| Stoney Brook Village Condominium Assoc | 142 | 4 ppb |
| Elkhorn Health And Rehabilitation Llc | 89 | 2 ppb |
| Jefferson Tracts Assoc Inc | 80 | 7 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Helena, 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 Jefferson Hills Wua 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. Systems that went over once often dip back under; here is what that means.