Sun Prairie Village County, MT
Lead detected, under the action levels
Latest 90th-percentile lead: 1 ppb (monitoring period 2021-2023). 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.
Who runs the water here
Sun Prairie Village County serves about 1,800 people through 492 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 Cascade County, Montana. EPA system ID: MT0000521; phone on file: 406-965-3944. They can tell you what your service line is made of and whether they pay to replace it.
Sun Prairie Village County's lead record
Against the period ending 2022 (2 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Sun Prairie Village County is 6 ppb across 6 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 1 ppb |
| 2022 | 2 ppb |
| 2017 | 2 ppb |
| 2017 | 6 ppb |
| 2017 | 2 ppb |
| 2016 | 6 ppb |
How Sun Prairie Village County 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. Sun Prairie Village County's 1 ppb sits at the 60th percentile in Montana and the 54th nationally (higher means more lead).
Neighbouring systems
41 other systems share Cascade County; 8 of them have a higher latest lead result than Sun Prairie Village County. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Great Falls City Of | 60,000 | 12 ppb |
| Malmstrom Air Force Base | 8,850 | 0 (not detected) |
| Black Eagle Cascade County Water Sewer | 1,233 | 0 (not detected) |
| Prairie Water Company | 1,000 | 0 (not detected) |
| Cascade Town Of | 650 | 2 ppb |
| Belt Town Of | 600 | 0 (not detected) |
| Vaughn Cascade County Water And Sewer | 585 | 0 (not detected) |
| Two Buttes Water Users Assn | 525 | 2 ppb |
| Gore Hill County Water Dist | 500 | 1 ppb |
| Homestead Acres County Water And Sewer | 500 | 0 (not detected) |
Next steps for Great Falls, MT
Test your own tap with a certified lab first-draw sample; Great Falls, 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 Sun Prairie Village County 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. What a 90th-percentile result does and does not tell you: how to read a lead result. Systems that went over once often dip back under; here is what that means.