Twin Hills Colony Inc, MT
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Who runs the water here
Twin Hills Colony Inc serves about 78 people through 19 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws surface water, in Chouteau County, Montana. EPA system ID: MT0003978; phone on file: 406-734-5280. 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 2021 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Twin Hills Colony Inc is 0 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2018 | 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. Twin Hills Colony Inc's reported as 0 (not detected) sits at the 14th percentile in Montana and the 7th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Chouteau County
10 other systems share Chouteau County; 6 of them have a higher latest lead result than Twin Hills Colony Inc. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Fort Benton City Of | 1,500 | 2 ppb |
| Big Sandy Town Of | 608 | 0 (not detected) |
| Highwood County Water And Sewer District | 280 | 2 ppb |
| Geraldine Town Of | 260 | 3 ppb |
| Loma County Water District | 200 | 1 ppb |
| Carter Chouteau Co Water Dist | 150 | 0 (not detected) |
| South Chouteau County Water Dist | 80 | 2 ppb |
| Sunny Brook Colony | 80 | 0 (not detected) |
| North Geraldine Water System | 50 | 0 (not detected) |
| Hawarden Square Butte Water | 50 | 2 ppb |
What to do in your house
Look up your address in Twin Hills Colony Inc's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Twin Hills Colony Inc 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. Why sampled homes are the worst-case ones is in the guide to reading the number. A zero today does not rule out a jump later - the rules are tightening in 2027.