Oak Ridge Estates, MT
Lead detected, under the action levels
Latest 90th-percentile lead: 5 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.
Oak Ridge Estates at a glance
Oak Ridge Estates serves about 200 people through 81 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: MT0004250; phone on file: 406-652-5523. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Oak Ridge Estates's lead record
That is up 2 ppb from 3 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Oak Ridge Estates is 5 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 5 ppb |
| 2022 | 3 ppb |
| 2019 | 4 ppb |
| 2016 | 1 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. Oak Ridge Estates's 5 ppb sits at the 93rd percentile in Montana and the 91st nationally (higher means more lead).
Nearby utilities
45 other systems share Yellowstone County; 1 of them has a higher latest lead result than Oak Ridge Estates. 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 |
Next steps for Billings, MT
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 Oak Ridge Estates 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. Size matters more than most people expect: small vs large water systems.