The Chesapeake Bay TMDL (Total Maximum Daily Load) nutrient and sediment allocations were officially put in place in 2010, but nutrient reduction efforts were in place long before that.

The Bay TMDL identifies the necessary pollution reductions of nitrogen, phosphorus and sediment across the seven Bay watershed jurisdictions of Delaware, Maryland, New York, Pennsylvania, Virginia, West Virginia and the District of Columbia to meet applicable water quality standards in the Bay and its tidal waters.

Each state or jurisdiction established a Watershed Implementation Plan (WIPs) ...