MI HB4768

Establishes a microplastics monitoring program for public water supplies running from July 1, 2027 through July 1, 2030, requiring quarterly testing and sampling by the Department of Environment, Great Lakes, and Energy

Requires testing of drinking water from multiple source types including Great Lakes shoreline surface water, major tributaries, inland lakes, groundwater near agricultural operations, and groundwater within 1 mile of landfills

Defines microplastics as solid plastic materials measuring less than 5 millimeters with at least 3 dimensions, excluding naturally occurring polymers

Mandates a report to the legislature by July 1, 2031 summarizing findings on microplastic quantities, shapes, polymer types, potential sources, toxicity limits, and preliminary risk assessments

Requires recommendations for continued monitoring, expanded analysis, and public protection measures based on peer-reviewed research and EPA findings