Grosse Pointe Park, MI
Lead detected, under the action levels
Latest 90th-percentile lead: 3.4 ppb (monitoring period 2025-2025). 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.
Grosse Pointe Park at a glance
Grosse Pointe Park serves about 11,555 people through 4,009 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Wayne County, Michigan. EPA system ID: MI0002900; phone on file: 313-822-4361. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
Against the period ending 2024 (3.5 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Grosse Pointe Park is 9.1 ppb across 9 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 3.4 ppb |
| 2024 | 3.5 ppb |
| 2024 | 5 ppb |
| 2023 | 6.6 ppb |
| 2022 | 7.4 ppb |
| 2021 | 7.2 ppb |
| 2020 | 4.48 ppb |
| 2019 | 9.1 ppb |
| 2017 | 0 (not detected) |
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. Grosse Pointe Park's 3.4 ppb sits at the 80th percentile in Michigan and the 85th nationally (higher means more lead).
Other water systems in Wayne County
43 other systems share Wayne County; 16 of them have a higher latest lead result than Grosse Pointe Park. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Detroit City Of | 633,218 | 7.5 ppb |
| Dearborn | 109,976 | 6 ppb |
| Canton Township | 99,627 | 0 (not detected) |
| Livonia | 96,942 | 0 (not detected) |
| Westland | 85,420 | 0 (not detected) |
| Taylor | 63,409 | 10.7 ppb |
| Dearborn Heights | 57,774 | 0 (not detected) |
| Redford Township | 49,504 | 8.2 ppb |
| Lincoln Park | 38,144 | 3.1 ppb |
| Brownstown Township | 33,194 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Grosse Pointe Park, 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 Grosse Pointe Park 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.