DC WASA has installed a Combined Sewer Overflow (CSO) Event Indicator Control System to monitor and indicate combined sewer overflow (CSO) discharges at two outfall locations – one along the Potomac River at Rock Creek Parkway and Thompson’s Boat House and the other along the Anacostia River near 13th Street and Ridge Place, SE near DC WASA’s Main and O Street pumping stations.

When activated, a red light will alert boaters of an actual CSO event occurrence and an amber light will be illuminated for 24 hours after the CSO has stopped.

Signs are posted at each outfall location.