The main purpose of this legislation is to renew and extend the Columbia River Basin Restoration program, which is part of the Federal Water Pollution Control Act. The goal is to enhance efforts to clean and restore the Columbia River Basin, ensuring better water quality and environmental health in the region. Key provisions of the legislation include the amendment of existing law to change the authorization period for the Columbia River Basin Restoration program. Specifically, it updates the program's funding timeline from the years 2020 and 2021 to a new period spanning from 2026 to 2030.