(a) Whenever the Agency identifies any volatile organic compound in excess of the Board’s Groundwater Quality Standards or the Safe Drinking Water Act maximum contaminant level while performing its obligations under Section 7 of this Act, § 13.1 of the Environmental Protection Act, or the federal Safe Drinking Water Act, the Agency shall notify the Department, unless notification has already been provided, and the unit of local government affected.
     (b) Within 60 days of receipt of notice provided for in subsection (a) of this Section, the Department, or the Department in coordination with the delegated county health department, shall provide notice to the public identifying the contaminants of concern. The notice shall be provided by means of electronic or print media and must be designed to inform the owner of any private water system, semi-private water system, or non-community public water system within an area potentially affected by the identified contamination of the need for the system owner to test the system for possible contamination. The notice shall appear in the media for 3 consecutive weeks.
     (c) A unit of local government shall take any action that it deems appropriate, such as informing any homeowner who potentially could be adversely affected, within a reasonable time after notification by the Agency under subsection (a) of this Section.