In June, Ohio Gov. John Kasich signed legislation, which instituted a series of new restrictions on lead in the state's drinking water. The changes involved accelerated notifications of residents whose homes were detected with lead in the drinking water, and a requirement that every public water system in the state identify and map the locations of lead piping in their entire service areas.
The public water systems can track the pipes by researching permit records, water main breaks, maintenance work records, and other instances when the pipes were exposed and observed.
The water system records do not, however, identify which houses or buildings contain lead service lines. The water systems own the service lines to the home's property line, but the property owner owns the pipes from the property line to his or her home.
The deadline for completion of the mapping requirement is March 2017. Some water systems, such as Cleveland's, have already finished mapping the underground piping in their service areas. The new law requires every water system to update the maps every five years.
More details here.
Source: The Plain Dealer