The City of Westerville has separated water production and water distribution into two Departments. The production of potable water, the maintenance of the system pumps, the maintenance of meters, and the maintenance of water tanks is the responsibility of the Water Treatment Plant. The Water Distribution System and the maintenance of fire hydrants is the responsibility of the Department of Public Service.

The department manages the water distribution system, wastewater collection, hydrant flushing, stormwater management, and mosquito control.