The "American Water Stewardship Act" amends the Federal Water Pollution Control Act to extend funding for various water restoration initiatives, including the Great Lakes Restoration Initiative, Long Island Sound, Columbia River Basin restoration, and San Francisco Bay restoration program, through 2031. It also expands the National Estuary Program to include Mississippi Sound, extends funding for Coastal Recreation Water Quality Monitoring and Notification grants, and restricts the use of funds for foreign entities. Additionally, it requires a report on the effectiveness and management of EPA geographic programs, providing recommendations for improvement.