Knox County Water And Wastewater Pws, OH
Lead detected, under the action levels
Latest 90th-percentile lead: 2.09 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. 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
Knox County Water And Wastewater Pws serves about 8,250 people through 3,300 service connections, which makes it a medium-sized system under EPA's size classes. It is privately owned and draws groundwater, in Knox County, Ohio. EPA system ID: OH4202012; phone on file: 740-397-7041. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
That is up 1.19 ppb from 0.9 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for Knox County Water And Wastewater Pws is 2.09 ppb across 9 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2.09 ppb |
| 2024 | 0.9 ppb |
| 2023 | 0 (not detected) |
| 2022 | 0.9 ppb |
| 2021 | 0.6 ppb |
| 2020 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2016 | 0 (not detected) |
How Knox County Water And Wastewater Pws compares
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. Knox County Water And Wastewater Pws's 2.09 ppb sits at the 78th percentile in Ohio and the 74th nationally (higher means more lead).
Nearby utilities
8 other systems share Knox County; 0 of them have a higher latest lead result than Knox County Water And Wastewater Pws. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Mount Vernon City Pws | 16,990 | 0 (not detected) |
| Fredericktown Village | 2,648 | 1.8 ppb |
| Gambier Village Pws | 2,300 | 0 (not detected) |
| Danville Village Pws | 994 | 0 (not detected) |
| Martinsburg Village Pws | 240 | 0 (not detected) |
| Colonial Terrace Mhc Llc | 110 | 0.3 ppb |
| Grandview Mhp A Pws | 74 | 1 ppb |
| Grandview Mhp B | 47 | 0.7 ppb |
Next steps for Mount Vernon, OH
Test your own tap with a certified lab first-draw sample; Mount Vernon, OH 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 Knox County Water And Wastewater Pws 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.