The bill amends the Safe Drinking Water Act of 1976 by updating definitions and clarifying the responsibilities of the Department of Environment, Great Lakes, and Energy regarding public water supplies. Key insertions include the definitions of "bottled drinking water," "capacity assessment," and "customer site piping," which now specifies that customer site piping consists only of distribution and storage facilities owned by the customer. Additionally, the bill introduces terms such as "mobile home" and "seasonal mobile home park," and revises existing definitions to enhance clarity and ensure compliance with state drinking water standards.

Furthermore, the bill empowers the department to inspect waterworks systems and take necessary actions to protect public health, including issuing emergency orders without prior notice if a waterworks system poses an imminent hazard. It also outlines the process for suppliers of water or owners of customer site piping to respond to orders from the department, including the option to request a public hearing. The amendments aim to ensure that waterworks systems can provide adequate and healthful water that meets state standards, thereby enhancing the overall safety and quality of drinking water in Michigan.