Windsor Estates, MT
Lead detected, under the action levels
Latest 90th-percentile lead: 1 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.
Windsor Estates at a glance
Windsor Estates serves about 530 people through 213 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws surface water, in Yellowstone County, Montana. EPA system ID: MT0003807; phone on file: 406-209-1699. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
Against the period ending 2019 (2 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Windsor Estates is 2 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1 ppb |
| 2019 | 2 ppb |
| 2016 | 1 ppb |
Where this result ranks
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. Windsor Estates's 1 ppb sits at the 58th percentile in Montana and the 53rd nationally (higher means more lead).
Other water systems in Yellowstone County
45 other systems share Yellowstone County; 15 of them have a higher latest lead result than Windsor 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) |
| Pryor Creek Water Assn | 475 | 1 ppb |
Next steps for Lincoln, MT
Test your own tap with a certified lab first-draw sample; Lincoln, 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 Windsor 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. 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.