Senate Bill 104 mandates that all public and private schools in Wisconsin develop a comprehensive drinking water management plan within 15 months of the bill's enactment. This plan must include the identification of locations for filtered bottle-filling stations and faucets, ensure at least one filtered bottle-filling station for every 100 occupants, and establish a schedule for regular water sampling and testing for contaminants such as lead, PFOA, and PFOS. If testing reveals lead levels between one and five parts per billion, schools must check filters and retest the water. If levels exceed five parts per billion or if PFOA or PFOS are detected above state or federal standards, schools must shut off the affected water outlet, notify parents, and develop a remediation plan.

Additionally, by August 1, 2027, schools are required to install the specified filtered water stations and faucets, while prohibiting the installation of non-filtered drinking fountains. The Department of Public Instruction (DPI) is tasked with assisting schools in compliance by providing templates, training, and information on water safety. The bill also allows DPI to award grants to schools for compliance costs, although it does not allocate funding for these grants, requiring DPI to seek supplemental funding from the Joint Committee on Finance.