Cool Spring Colony, MT
Lead detected, under the action levels
Latest 90th-percentile lead: 1 ppb (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. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
Cool Spring Colony at a glance
Cool Spring Colony serves about 75 people through 18 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: MT0004051; phone on file: 406-952-6317. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2023 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Cool Spring Colony is 1 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1 ppb |
| 2023 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2017 | 1 ppb |
How Cool Spring 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. Cool Spring Colony's 1 ppb sits at the 48th percentile in Montana and the 51st nationally (higher means more lead).
Neighbouring systems
9 other systems share Hill County; 3 of them have a higher latest lead result than Cool Spring 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 | - |
| Hidden Valley Colony | 80 | 0 (not detected) |
| Hilldale Colony | 79 | 0 (not detected) |
| Gildford Colony | 70 | 0 (not detected) |
Next steps for Rudyard, MT
Test your own tap with a certified lab first-draw sample; Rudyard, MT may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Cool Spring 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. The lead result guide covers how utilities pick the homes they sample. Size matters more than most people expect: small vs large water systems.