Duncan Ranch Colony, 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
Duncan Ranch Colony serves about 96 people through 17 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Wheatland County, Montana. EPA system ID: MT0000418; phone on file: 406-380-2933. 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 2018 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Duncan Ranch Colony is 0 ppb across 2 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 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. Duncan Ranch Colony's reported as 0 (not detected) sits at the 18th percentile in Montana and the 9th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
6 other systems share Wheatland County; 3 of them have a higher latest lead result than Duncan Ranch Colony. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Harlowton City Of | 1,050 | 2 ppb |
| Martinsdale Colony | 150 | 0 (not detected) |
| Judith Gap Town Of | 126 | 0 (not detected) |
| Springwater Colony | 100 | 1 ppb |
| Cmrwa Musselshell Judith Rural Water Sys | 100 | - |
| Two Dot Water Users Company | 50 | 3 ppb |
What to do in your house
Look up your address in Duncan Ranch 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 Duncan Ranch 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. 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.