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Pollution remains a major threat to the Potomac River, its tributaries and the Chesapeake Bay where it flows.
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The river still gets a D grade for quality. The population increase in the region of more than 2 million people over the next 20 years will put more pressure on a river, says the Potomac Conservancy.
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In its annual report on the condition of the Potomac, often called “Nation’s River,” the Conservancy reports that more buffer space is needed between development and the river.