Interestingly, there's an app for that now. Back in the day, the canoe commuters had to take their chances. https://www.potomacriverkeepernetwork.org/community-

Interestingly, there's an app for that now. Back in the day, the canoe commuters had to take their chances. https://www.potomacriverkeepernetwork.org/community-science-volunteer-water-quality-monitoring-program/ https://www.potomacriverkeepernetwork.org/community-science-... The CIA's location upriver is non-tidal, so it's clean-ish compared to the tidal waters of DC proper. DC's 19th-century sanitary sewers overflow into the storm drains when it rains. Yes, this is as gross as it sounds. DC Water is working on it. https://www.dcwater.com/css https://www.dcwater.com/css Edited to add: One of the sewage outfalls runs directly from the White House into the Potomac River near the Kennedy Center. Make of that what you will.