Swan Lake Estates, MT
Lead detected, under the action levels
Latest 90th-percentile lead: 1.88 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.
Swan Lake Estates at a glance
Swan Lake Estates serves about 115 people through 46 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Lafayette County, Montana. EPA system ID: MO1041186; phone on file: 406-291-2629. They can tell you what your service line is made of and whether they pay to replace it.
Swan Lake Estates's lead record
That is up 1.88 ppb from 0 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Swan Lake Estates is 1.88 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1.88 ppb |
| 2022 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | 0 (not detected) |
| 2016 | 0 (not detected) |
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. Swan Lake Estates's 1.88 ppb sits at the 62nd percentile in Montana and the 68th nationally (higher means more lead).
Next steps for Trego, MT
Test your own tap with a certified lab first-draw sample; Trego, 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 Swan Lake 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.