In 2014, Prince George’s County — bordering Washington, D.C., and nestled between three Chesapeake Bay tributaries — received a mandate from the state. To clean up the bay by 2025, it must retrofit about five percent of its total land area to reduce stormwater runoff, one of the biggest polluters of the county’s streams and rivers. That is 15,000 acres of parking lots, roads and other hard surfaces that can generate thousands of gallons of polluted runoff every time it rains.

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