Little Walnut Water Treatment Facility, OH
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. 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.
Who runs the water here
Little Walnut Water Treatment Facility serves about 1,428 people through 541 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Fairfield County, Ohio. EPA system ID: OH2303212; phone on file: 614-419-3611. They can tell you what your service line is made of and whether they pay to replace it.
Little Walnut Water Treatment Facility's lead record
Against the period ending 2025 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Little Walnut Water Treatment Facility is 0.92 ppb across 10 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2021 | 0.8 ppb |
| 2020 | 0.92 ppb |
| 2019 | 0.61 ppb |
| 2018 | 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. Little Walnut Water Treatment Facility's reported as 0 (not detected) sits at the 25th percentile in Ohio and the 29th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
20 other systems share Fairfield County; 13 of them have a higher latest lead result than Little Walnut Water Treatment Facility. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Lancaster City Pws | 40,400 | 0.8 ppb |
| Pickerington City Pws | 19,141 | 0.6 ppb |
| Fairfield County Utilities Pws | 19,113 | 0 (not detected) |
| Millersport Village Pws | 3,200 | 0.6 ppb |
| Baltimore Village Pws | 2,995 | 2.1 ppb |
| Canal Pointe Industrial Park Pws | 1,721 | 0.5 ppb |
| Lithopolis Village Pws | 1,573 | 3.1 ppb |
| Odrc-Southeastern Correctional Institute | 1,461 | 0.5 ppb |
| Bremen Village | 1,425 | 0 (not detected) |
| Pleasantville Village Pws | 960 | 0 (not detected) |
What to do in your house
Look up your address in Little Walnut Water Treatment Facility'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 Little Walnut Water Treatment Facility 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. A zero today does not rule out a jump later - the rules are tightening in 2027.