Still River Estates Subdivision, MT
Lead detected, under the action levels
Latest 90th-percentile lead: 8 ppb (monitoring period 2026-2026). 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
Still River Estates Subdivision serves about 188 people through 33 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Yellowstone County, Montana. EPA system ID: MT0005118; phone on file: 406-672-1448. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Still River Estates Subdivision's lead record
That is up 6 ppb from 2 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Still River Estates Subdivision is 8 ppb across 5 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 8 ppb |
| 2025 | 2 ppb |
| 2024 | 4 ppb |
| 2023 | 0 (not detected) |
| 2023 | 0 (not detected) |
How Still River Estates Subdivision 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. Still River Estates Subdivision's 8 ppb sits at the 96th percentile in Montana and the 96th nationally (higher means more lead).
Neighbouring systems
45 other systems share Yellowstone County; 0 of them have a higher latest lead result than Still River Estates Subdivision. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Billings City Of | 114,000 | 3 ppb |
| Billings Heights Co Water Dist Of | 12,000 | 3 ppb |
| Laurel Municipal Water System | 6,339 | 2 ppb |
| Lockwood Water And Sewer District | 5,900 | 3 ppb |
| Pioneer Water Service | 900 | 0 (not detected) |
| Go 2 U Water Delivery | 875 | 0 (not detected) |
| Worden Ballantine Yellowstone | 800 | 3 ppb |
| Fisher Water Service | 750 | 0 (not detected) |
| Cherry Creek Estates Llc | 600 | 0 (not detected) |
| Windsor Estates | 530 | 1 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Billings, 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 Still River Estates Subdivision 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.