Water supply: quality and standards; testing and reporting of the amount of microplastics in public drinking water supplies; require. Amends sec. 5 of 1976 PA 399 (MCL 325.1005) & adds sec. 6a.

HB 4768 requires Michigan's environmental department to establish a program testing public drinking water for microplastics from 2027 to 2030. The program mandates quarterly testing using methods from agencies like the EPA, focusing on water sources such as Great Lakes tributaries, groundwater near landfills, and agricultural areas. By July 2031, the department must submit a report to the legislature detailing microplastic levels, testing methods, and recommendations for future action. This bill creates a baseline study to understand microplastic presence without setting immediate regulatory limits.