Navy Yard outfalls keep blowing past PAH limits, three quarters running

August 17, 2026Chesapeake Rolling Coastal Plain

Stormwater leaving Washington Navy Yard on the Anacostia River is carrying polycyclic aromatic hydrocarbons at levels that make the word "exceedance" feel almost too polite. Effluent testing on August 8 found PAH concentrations at one outfall running 59,704% over its permitted limit, and 36,590% over at a second outfall. That is not a one-time lab anomaly. The same two outfalls exceeded limits by 27,043% and 5,808% in March, and by 35,934% back in December. Three consecutive quarters, same facility, same violation, same stretch of river.

PAHs form whenever fuel, coal, or other organic material burns incompletely, and once they reach a river they don't simply wash downstream and disappear. They settle into sediment, persist for years, and move up the food chain as bottom-dwelling organisms take them in and larger predators eat those in turn. This particular reach of the Anacostia sits on a federal Superfund site and already carries a legacy of industrial contamination in its sediments; the Navy Yard's own permit also flags PCBs, copper, lead, and zinc as parameters of concern, a fairly complete inventory of twentieth-century industrial runoff.

A repeating exceedance of this magnitude, at a federal facility, layered onto decades of contaminated sediment, is exactly the kind of pattern regulators describe as significant noncompliance. Groups like Anacostia Riverkeeper and the Anacostia Watershed Society are active in the watershed, and three straight quarters of outfalls running tens of thousands of percent over limit is exactly the kind of pattern that warrants their attention.

Data from EPA ECHO

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