American University’s documentary Keeping the Potomac: The Politics of Water will air January 24 at 7:30pm on Maryland Public Television, and again on Saturday, January 28 at 4:30pm. In May, it will also air in prime time as part of Maryland Public Television’s Chesapeake Bay Week.

American University filmed Upper Potomac Riverkeeper Brent Walls, Shenandoah Riverkeeper Mark Frondorf, and Potomac Riverkeeper Dean Naujoks on the job as they fought some of the biggest polluters in their watersheds.

Watch a trailer: