Synopsis As Introduced Creates the Reduction of Lead Service Lines Act. Requires community water supplies to identify and replace all lead service lines that connect to a water main. Provides that every community water supply in Illinois that has known lead service lines shall create a plan, to be submitted to the Environmental Protection Agency for approval, to replace all lead service lines and galvanized service lines if the service line is or was connected to lead piping. Provides that, within legal bounds, a community water supply shall have the authority to access private property and private residences for the sole purpose of identifying or replacing lead service lines or galvanized service lines. Provides that no person shall replace a portion of a lead service line without replacing the entirety of the line at the same time, except in cases of emergency repair. Amends the Department of Commerce and Economic Opportunity Law of the Civil Administrative Code of Illinois. Requires the Department of Commerce and Economic Opportunity to establish a comprehensive low-income water assistance policy and program. Amends the Public Utilities Act. Removes references to unaccounted-for water and replaces them with references to nonrevenue water. Provides that the Illinois Commerce Commission may allow or direct a water utility to establish a customer assistance program. Provides that certain entities that serve or provide water or sewer services shall prepare a summary of the cost of service for a given calendar year. Effective immediately.