Grand Lake Estates, OH
Lead reported as not detected
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 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.
Grand Lake Estates at a glance
Grand Lake Estates serves about 103 people through 68 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Mercer County, Ohio. EPA system ID: OH5400312; phone on file: 419-733-9451. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is down 15 ppb from 15 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for Grand Lake Estates is 15 ppb across 11 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2024 | 15 ppb over 10 |
| 2023 | 3.27 ppb |
| 2022 | 0 (not detected) |
| 2021 | 3.2 ppb |
| 2020 | 0.72 ppb |
| 2019 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2017 | 0 (not detected) |
| 2016 | 0 (not detected) |
| 2016 | 0 (not detected) |
Where this result ranks
Of the 1,079 Ohio systems with a lead result, the median latest reading is 0.7 ppb; 1 are over 15 ppb right now and 27 have gone over at some point. Grand Lake Estates's reported as 0 (not detected) sits at the 6th percentile in Ohio and the 10th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
8 other systems share Mercer County; 5 of them have a higher latest lead result than Grand Lake Estates. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Celina, City Of | 11,682 | 0 (not detected) |
| Coldwater Village | 4,774 | 0 (not detected) |
| St Henry Village | 2,596 | 2 ppb |
| Ft Recovery Village | 1,501 | 1.8 ppb |
| Rockford Village | 1,120 | 4 ppb |
| Mendon Village | 628 | 1.8 ppb |
| Chickasaw Village | 358 | 0 (not detected) |
| Saint Charles Center | 142 | 1.4 ppb |
Next steps for New Knoxville, OH
Look up your address in Grand Lake Estates'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 Grand Lake Estates 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. Why sampled homes are the worst-case ones is in the guide to reading the number. Small systems behave differently: why small systems go over more often.