16 counties
Counties in Ohio
- Belmont County1 water
- Delaware County3 waters
- Guernsey County1 water
- Hamilton County1 water
- Hancock County1 water
- Harrison County2 waters
- Licking County1 water
- Madison County1 water
- Mahoning County1 water
- Miami County1 water
- Noble County1 water
- Ottawa County1 water
- Pike County1 water
- Ross County1 water
- Trumbull County3 waters
- Wood County1 water