Prohibit adding fluoride to public water supply systems

This bill prohibits the addition of fluoride to any public water supply system in Montana. It directly affects water utilities, municipalities, and state agencies responsible for managing public water systems. The legislation amends existing state codes to explicitly ban fluoridation as a prohibited act and requires the state department to adopt rules for enforcing water supply standards. The bill also clarifies local government authority in reviewing water and sewage systems while maintaining state oversight for certification and compliance.