Hillside Colony Inc, MT
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2024-2026). 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 Hillside Colony Inc
Hillside Colony Inc serves about 100 people through 12 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Toole County, Montana. EPA system ID: MT0001782; phone on file: 406-937-2966. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Hillside Colony Inc's lead record
Against the period ending 2019 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Hillside Colony Inc is 0 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2017 | 0 (not detected) |
Where this result ranks
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. Hillside Colony Inc's reported as 0 (not detected) sits at the 19th 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.
Neighbouring systems
14 other systems share Toole County; 6 of them have a higher latest lead result than Hillside Colony Inc. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Shelby City Of | 3,970 | 2 ppb |
| Sunburst Town Of | 459 | 1 ppb |
| Oilmont County Water District | 300 | 0 (not detected) |
| Ncmrwa North Shelby | 300 | 0 (not detected) |
| Kevin Town Of | 290 | 12 ppb |
| Galata County Water District | 200 | 0 (not detected) |
| Rimrock Colony | 124 | 0 (not detected) |
| Sweetgrass Water Users Assn | 100 | 15 ppb |
| Camrose Colony | 95 | 0 (not detected) |
| Nine Mile Co Water And Sewer District | 90 | 1 ppb |
Next steps for Sweet Grass, MT
Look up your address in Hillside 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 Hillside 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. The lead result guide covers how utilities pick the homes they sample. Small systems behave differently: why small systems go over more often.