Hidden Valley Colony, 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.
Who runs the water here
Hidden Valley Colony serves about 80 people through 2 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Hill County, Montana. EPA system ID: MT0004987; phone on file: 406-201-3107. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
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 Hidden Valley Colony is 0 ppb across 2 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 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. Hidden Valley 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.
Other water systems in Hill County
9 other systems share Hill County; 5 of them have a higher latest lead result than Hidden Valley Colony. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Havre City Of | 9,921 | 3 ppb |
| Hill County Water Districts | 1,720 | 1 ppb |
| East End Colony Inc | 100 | 0 (not detected) |
| North Havre County Water Dist | 90 | 3 ppb |
| Ncmrwa North Havre Cwd Leg | 90 | 11 ppb |
| Bitterroot Tp Havre Unapproved | 88 | - |
| Hilldale Colony | 79 | 0 (not detected) |
| Cool Spring Colony | 75 | 1 ppb |
| Gildford Colony | 70 | 0 (not detected) |
Your move
Look up your address in Hidden Valley 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 Hidden Valley 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.