In 2008, EPA made a preliminary determination to use its residual designation authority (RDA) under the Clean Water Act to designate stormwater discharges from two or more acres of impervious surfaces in the Lower Charles River 
Watershed and released a draft general permit to cover such discharges. However, EPA never finalized that designation.
In 2013, the Conservation Law Foundation and other groups petitioned EPA Regions 1,… More