Stone Ridge, MI
Lead detected, under the action levels
Latest 90th-percentile lead: 3 ppb (monitoring period 2020-2022). 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.
Who runs the water here
Stone Ridge serves about 367 people through 136 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: MI0006423; phone on file: 810-735-6000. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is up 2 ppb from 1 ppb in the period ending 2019. The highest 90th-percentile result EPA holds for Stone Ridge is 3 ppb across 5 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2022 | 3 ppb |
| 2019 | 1 ppb |
| 2018 | 1 ppb |
| 2017 | 0 (not detected) |
| 2016 | 0 (not detected) |
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. Stone Ridge's 3 ppb sits at the 76th percentile in Michigan and the 82nd nationally (higher means more lead).
Neighbouring systems
42 other systems share Livingston County; 9 of them have a higher latest lead result than Stone Ridge. 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 |
Next steps for Gaines, MI
Test your own tap with a certified lab first-draw sample; Gaines, 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 Stone Ridge 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. Size matters more than most people expect: small vs large water systems.