Sunny Brook Colony, MT
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2025-2025). 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.
About Sunny Brook Colony
Sunny Brook Colony serves about 80 people through 13 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Chouteau County, Montana. EPA system ID: MT0005121; phone on file: 406-964-3637. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Sunny Brook Colony's lead record
Against the period ending 2024 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Sunny Brook Colony is 0 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2024 | 0 (not detected) |
How Sunny Brook Colony 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. Sunny Brook Colony's reported as 0 (not detected) sits at the 15th 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.
Neighbouring systems
10 other systems share Chouteau County; 6 of them have a higher latest lead result than Sunny Brook Colony. 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 |
| Twin Hills Colony Inc | 78 | 0 (not detected) |
| North Geraldine Water System | 50 | 0 (not detected) |
| Hawarden Square Butte Water | 50 | 2 ppb |
Next steps for Choteau, MT
Look up your address in Sunny Brook Colony'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 Sunny Brook Colony 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. Small systems behave differently: why small systems go over more often.