Water system
Ontario City
EPA ID OH7003512 · Richland County · 6,756 people served · owned by a local government
Ontario City treats its own water from Groundwater wells (3 wells).
The system's record
- Active wells
- 3
- Serves
- 6,756 people · Richland County
- EPA ID
- OH7003512
About this area's water
Water quality & impurities
EPA compliance record
Lead at the tap: 90th-percentile result 2.7 ppb in 2025 (action level 15 ppb).
EPA record: no health-based violations since 2015.
1 violation of any kind logged since 2020, 1 of them paperwork (monitoring, reporting, public notice or consumer report).
Present in 2 ZIP codes
Serves
No ZIP code has Ontario City on record as its main water supplier.
Also present in 2 more ZIP codes
- 44906 · Mansfield27% of residents
- 44903 · Mansfield5% of residents
Population-weighted resident shares; a ZIP code can have more than one system on record. Recomputed from each ZIP's own system list, not from the map's cached footprint.
Buys from · Sells to
Ontario City does not buy water from another system on record; it treats its own source water.
No other system is on record buying water from Ontario City.
On the map
Show this system's territory on the map — 2 ZIP codes in all.
Sources
U.S. EPA SDWIS and Community Water System Service Area Boundaries (v3, 2026), Ohio EPA primacy data, 2020 census blocks: the system serving most residents, traced through purchases to the treating utility; Ohio EPA 2023 Sewer and Water Rate Survey (Ohio State, May 2025) for household bills; Ohio EPA DEFA loan awards since 2016 for the loans paragraph · EPA SDWIS · EPA service area boundaries · Ohio EPA drinking water · Ohio EPA rate survey