Owosso, City Of, MI
Exceeded the action level in the past
Latest 90th-percentile lead: 9 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. 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 Owosso, City Of
Owosso, City Of serves about 16,353 people through 6,340 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 Shiawassee County, Michigan. EPA system ID: MI0005120; phone on file: 989-725-0555. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is up 3 ppb from 6 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for Owosso, City Of is 21 ppb across 8 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 9 ppb |
| 2024 | 6 ppb |
| 2023 | 6 ppb |
| 2022 | 7 ppb |
| 2021 | 11 ppb over 10 |
| 2021 | 10 ppb |
| 2020 | 21 ppb over 15 |
| 2017 | 6 ppb |
How Owosso, City Of compares
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. Owosso, City Of's 9 ppb sits at the 96th percentile in Michigan and the 97th nationally (higher means more lead).
Nearby utilities
17 other systems share Shiawassee County; 1 of them has a higher latest lead result than Owosso, City Of. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Durand, City Of | 3,446 | 3 ppb |
| Perry, City Of | 2,065 | 3 ppb |
| Corunna, City Of | 2,028 | 0 (not detected) |
| Bancroft, Village Of | 616 | 0 (not detected) |
| New Lothrop, Village Of | 610 | 2 ppb |
| Byron, Village Of | 581 | 2 ppb |
| Woods And Fields Communities East | 528 | - |
| Countryside Village | 490 | 1 ppb |
| Morrice Meadows | 258 | - |
| Northwoods Community | 238 | 3 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Owosso, 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 Owosso, City 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. What a 90th-percentile result does and does not tell you: how to read a lead result. Why an old exceedance still matters: over the limit before, under it now.