Grass Lake, MI
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 12 ppb (monitoring period 2023-2023). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Under the current 15 ppb rule this is not an exceedance, but it is above the 10 ppb action level that takes over in Nov 2027. Test your own tap; filter if your result shows lead.
Grass Lake at a glance
Grass Lake serves about 1,986 people through 636 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 Jackson County, Michigan. EPA system ID: MI0002830; phone on file: 517-522-4550. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Grass Lake's lead record
The highest 90th-percentile result EPA holds for Grass Lake is 12 ppb across 1 monitoring period, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 12 ppb over 10 |
Where this result ranks
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. Grass Lake's 12 ppb sits at the 97th percentile in Michigan and the 98th nationally (higher means more lead).
Nearby utilities
21 other systems share Jackson County; 1 of them has a higher latest lead result than Grass Lake. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Jackson | 33,165 | 0 (not detected) |
| Summit Township | 25,355 | 0 (not detected) |
| Blackman Township | 21,222 | 0 (not detected) |
| Leoni Township | 1,893 | 19 ppb |
| Brooklyn | 1,313 | 3.6 ppb |
| Concord | 1,050 | 2 ppb |
| Sherman Oaks | 915 | 0 (not detected) |
| Springport | 800 | 0 (not detected) |
| Parma, Village Of | 768 | 0 (not detected) |
| Napoleon Township | 601 | - |
Your move
Test your own tap with a certified lab first-draw sample; Grass Lake, MI 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 Grass Lake 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. This system is in the band the 2027 10 ppb rule changes.