Oak Park, MI
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (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. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
About Oak Park
Oak Park serves about 29,654 people through 10,701 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 Oakland County, Michigan. EPA system ID: MI0004880; phone on file: 248-691-7497. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
Against the period ending 2024 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Oak Park is 25 ppb across 9 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2022 | 2.9 ppb |
| 2021 | 0 (not detected) |
| 2020 | 1.6 ppb |
| 2020 | 2 ppb |
| 2019 | 25 ppb over 15 |
| 2017 | 4.26 ppb |
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. Oak Park's reported as 0 (not detected) sits at the 35th percentile in Michigan and the 39th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
105 other systems share Oakland County; 47 of them have a higher latest lead result than Oak Park. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Troy | 85,854 | 0 (not detected) |
| Rochester Hills | 74,000 | 1.3 ppb |
| Waterford Township | 73,441 | 1 ppb |
| Southfield | 71,739 | 0 (not detected) |
| Pontiac | 63,776 | 1.6 ppb |
| Royal Oak, City Of | 57,236 | 4 ppb |
| Farmington Hills, City Of | 56,984 | 0 (not detected) |
| Novi, City Of | 56,780 | 0 (not detected) |
| West Bloomfield Township | 49,479 | 0 (not detected) |
| Bloomfield Township | 41,691 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Oak 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 Oak 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. The lead result guide covers how utilities pick the homes they sample. Why an old exceedance still matters: over the limit before, under it now.