The main purpose of this legislation is to stop the Delta Conveyance Project by preventing the U.S. Army Corps of Engineers from issuing any permits necessary for the project to proceed. The Delta Conveyance Project aims to modify the water delivery system in California's Sacramento-San Joaquin Delta, which has raised environmental and community concerns. The key provision of this legislation is a clear prohibition on the issuance of permits for the Delta Conveyance Project under the Federal Water Pollution Control Act.