Darby Town Of, 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.
Darby Town Of at a glance
Darby Town Of serves about 850 people through 397 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Ravalli County, Montana. EPA system ID: MT0000195; phone on file: 406-821-3753. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2025 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Darby Town Of is 5 ppb across 5 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2024 | 5 ppb |
| 2021 | 2 ppb |
| 2018 | 2 ppb |
How Darby Town Of 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. Darby Town Of's reported as 0 (not detected) sits at the 35th percentile in Montana and the 26th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
22 other systems share Ravalli County; 16 of them have a higher latest lead result than Darby Town Of. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Hamilton City Of | 5,660 | 2 ppb |
| Stevensville Town Of | 2,090 | 0 (not detected) |
| Pinesdale Town Of | 800 | 2 ppb |
| Trapper Creek Job Corps | 275 | 6 ppb |
| Kootenai Creek Village | 175 | 1 ppb |
| Stock Farm The | 150 | 2 ppb |
| Daly Estates Subdivision | 123 | 0 (not detected) |
| Wild Flower Hoa The | 120 | 1 ppb |
| Centennial Homeowner'S Association, Inc | 115 | 2 ppb |
| Westana Mobile Manor Hamilton | 90 | 0 (not detected) |
Next steps for Darby, MT
Look up your address in Darby Town Of'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 Darby Town Of whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1390 ppb (copper action level 1,300 ppb).
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. A zero today does not rule out a jump later - the rules are tightening in 2027.