This bill extends funding through 2031 for several EPA programs that clean up and protect specific bodies of water — including the Great Lakes, Long Island Sound, the Columbia River Basin, and various coastal estuaries — plus a program that funds testing for contamination at public beaches. It adds the Mississippi Sound to the list of protected estuaries and lets beach-monitoring grants also be used to track down the actual sources of water pollution, not just detect it. It also blocks this water-cleanup funding from going to organizations that are based in, or tied to, countries considered foreign adversaries. Finally, it requires a government watchdog agency to study how well these regional water programs are actually working and report back.