Thats probably the first time the Potomac has ever been called "fresh water" before. It isnt salt water but with everything that drains into it. It is far from fresh.
Everyone know what a combined stormwater system is? That is all through DC and the National Zoo. Basically the same pipes carry stormwater and sewage. Normally they dont mix. Normally. When it rains a lot they mix and it goes straight in the Potomac.
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Whenever I swim in the Columbia I can only imagine what would show up in a water test 🤢