Warren County, OH
Lead detected, under the action levels
Latest 90th-percentile lead: 1.4 ppb (monitoring period 2026-2026). 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.
About Warren County
Warren County serves about 99,000 people through 35,458 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 groundwater, in Warren County, Ohio. EPA system ID: OH8301512; phone on file: 513-695-1377. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Warren County's lead record
Against the period ending 2025 (1.4 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Warren County is 7 ppb across 13 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1.4 ppb |
| 2025 | 1.4 ppb |
| 2025 | 2 ppb |
| 2024 | 1.5 ppb |
| 2024 | 1.5 ppb |
| 2023 | 1.4 ppb |
| 2023 | 2.8 ppb |
| 2022 | 6.2 ppb |
| 2021 | 7 ppb |
| 2020 | 3.7 ppb |
| 2019 | 7 ppb |
| 2018 | 6.03 ppb |
| 2016 | 5.4 ppb |
How Warren County 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. Warren County's 1.4 ppb sits at the 67th percentile in Ohio and the 62nd nationally (higher means more lead).
Nearby utilities
14 other systems share Warren County; 8 of them have a higher latest lead result than Warren County. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Western Water Company | 39,508 | 1.3 ppb |
| Lebanon City | 20,700 | 1.2 ppb |
| Springboro Pws | 19,263 | 4.4 ppb |
| Franklin Public Water System | 11,690 | 2.1 ppb |
| South Lebanon City Pws | 7,792 | 0 (not detected) |
| Waynesville Village Pws | 4,100 | 1.6 ppb |
| Lebanon Correctional Institution | 3,410 | 4.4 ppb |
| Morrow Village Pws | 3,360 | 1.9 ppb |
| Carlisle City Pws | 1,675 | 1.7 ppb |
| Otterbein-Lebanon Retreat Center | 1,541 | 0.9 ppb |
Next steps for Lebanon, OH
Test your own tap with a certified lab first-draw sample; Lebanon, 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 Warren County 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. The lead result guide covers how utilities pick the homes they sample. Systems that went over once often dip back under; here is what that means.