St Ignatius Town Of, MT
Lead detected, under the action levels
Latest 90th-percentile lead: 1 ppb (monitoring period 2023-2025). 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
St Ignatius Town Of serves about 700 people through 291 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 Lake County, Montana. EPA system ID: MT0001740; phone on file: 406-745-3791. 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 2019 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for St Ignatius Town Of is 13 ppb across 4 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1 ppb |
| 2019 | 0 (not detected) |
| 2019 | 13 ppb over 10 |
| 2016 | 1 ppb |
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. St Ignatius Town Of's 1 ppb sits at the 59th percentile in Montana and the 53rd nationally (higher means more lead).
Other water systems in Lake County
24 other systems share Lake County; 8 of them have a higher latest lead result than St Ignatius Town Of. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Polson City Of | 5,300 | 2 ppb |
| Ronan City Of | 2,483 | 0 (not detected) |
| Pablo Lake County Water And Sewer Dist | 2,175 | 0 (not detected) |
| Woods Bay Water And Sewer District | 685 | 4 ppb |
| Consolidated Charlo Lake Co W And S Dist | 450 | 0 (not detected) |
| Round Butte Water Company | 400 | 2 ppb |
| Jette Meadows Lake Co W And S Dist | 375 | 1 ppb |
| Jette Lake Landowners Association | 295 | 0 (not detected) |
| Ridgewood Estates | 250 | 2 ppb |
| Mission Meadows Rv Campsite Park, Inc | 200 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; St Ignatius, 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 St Ignatius Town Of 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. Systems that went over once often dip back under; here is what that means.