Woodruff Lake Cooperative, MI
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2021-2023). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
About Woodruff Lake Cooperative
Woodruff Lake Cooperative serves about 95 people through 4 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Livingston County, Michigan. EPA system ID: MI0007185; phone on file: 248-769-7378. They can tell you what your service line is made of and whether they pay to replace it.
Woodruff Lake Cooperative's lead record
That is down 4 ppb from 4 ppb in the period ending 2020. The highest 90th-percentile result EPA holds for Woodruff Lake Cooperative is 4 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 0 (not detected) |
| 2020 | 4 ppb |
| 2017 | 1 ppb |
How Woodruff Lake Cooperative 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. Woodruff Lake Cooperative's reported as 0 (not detected) sits at the 9th percentile in Michigan and the 9th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
42 other systems share Livingston County; 29 of them have a higher latest lead result than Woodruff Lake Cooperative. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Mhog Sewer & Water Authority | 17,046 | 1 ppb |
| Brighton, City Of | 10,210 | 1 ppb |
| Howell, City Of | 9,914 | 0 (not detected) |
| Livingston Community Water Authority | 4,152 | 6 ppb |
| Hartland Township | 3,022 | 5 ppb |
| Fowlerville, Village Of | 2,951 | 0 (not detected) |
| Pinckney, Village Of | 2,353 | 0 (not detected) |
| Oak Pointe | 2,000 | 1 ppb |
| Cidermill Crossings | 1,863 | 3 ppb |
| Fonda Lake Water Authority | 1,705 | 2 ppb |
Your move
Look up your address in Woodruff Lake Cooperative's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Woodruff Lake Cooperative 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. A zero today does not rule out a jump later - the rules are tightening in 2027.