Lake Isabella Water Dist. #1, MI
Above the federal action level
Latest 90th-percentile lead: 41 ppb (monitoring period 2022-2024). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. In the most recent monitoring period, more than 10% of the sampled homes measured above 15 ppb. Use a filter certified to NSF/ANSI 53 for lead for drinking and cooking now, and test your own tap.
Who runs the water here
Lake Isabella Water Dist. #1 serves about 327 people through 109 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Isabella County, Michigan. EPA system ID: MI0003435; phone on file: 989-317-4072. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
That is up 39 ppb from 2 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Lake Isabella Water Dist. #1 is 41 ppb across 3 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 41 ppb over 15 |
| 2021 | 2 ppb |
| 2018 | 6 ppb |
Against other Michigan systems
Of the 1,227 Michigan systems with a lead result, the median latest reading is 1 ppb; 31 are over 15 ppb right now and 109 have gone over at some point. Lake Isabella Water Dist. #1's 41 ppb sits at the 99th percentile in Michigan and the 100th nationally (higher means more lead).
Other water systems in Isabella County
11 other systems share Isabella County; 0 of them have a higher latest lead result than Lake Isabella Water Dist. #1. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Mount Pleasant | 21,688 | 1.4 ppb |
| Union Township | 12,927 | 2 ppb |
| Shepherd, Village Of | 1,515 | - |
| Mapleview Estates East | 220 | 0 (not detected) |
| Broomfield Valley | 212 | 6 ppb |
| Country Place | 115 | 0 (not detected) |
| Mapleview Estates | 93 | 0 (not detected) |
| Maple Leaf Village | 50 | 0 (not detected) |
| Country Place Senior Care Center | 40 | - |
| Rosebush Estates Apartments | 30 | - |
Next steps for Mt Pleasant, MI
Use a filter certified to NSF/ANSI 53 for lead on the tap you drink and cook from, now, before you test. Then test your own tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Lake Isabella Water Dist. #1 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. The action level is dropping - the 10 ppb rule from 2027.