The purpose of the Advanced Wastewater Treatment Assistance Act of 2026 is to create a grant program that supports advanced wastewater treatment projects across the United States. This initiative aims to improve water quality and public health by funding projects that can effectively treat wastewater, especially in areas that may be underserved or face environmental challenges. Key provisions of the Act include the establishment of a grant program managed by the Environmental Protection Agency (EPA), which will allocate funds to each state based on a specific formula.