The U.S. Environmental Protection Agency (EPA) is issuing a supplemental proposed rule to reduce the spread of invasive species that occurs with normal operation of large marine vessels. Following public input on EPA’s 2020 proposed rule—including meetings with states, Tribes, and other stakeholders—the agency is now issuing a Supplemental Notice to share new data and control options raised by stakeholders. This supplemental proposal will bolster the development of a final rule to stem the spread of invasive species and better protect our nation’s aquatic ecosystems.