Chesapeake Bay State and Local Backstop Limitation Act of 2012

[AI summary unavailable — showing source text] Chesapeake Bay State and Local Backstop Limitation Act of 2012 - Prohibits the Administrator of the Environmental Protection Agency (EPA) from: (1) modifying a permit issued under the Federal Water Pollution Control Act (commonly known as the Clean Water Act) before this Act's enactment for a point source in the Chesapeake Bay watershed to require additional reductions in discharges of nitrogen, phosphorus, or sediment; or (2) requiring lower levels of discharges of such pollutants under a national pollutant discharge elimination system (NPDES) permit for a point source in such watershed for purposes of compensating for any lack of progress in a state toward meeting the water quality goals established by the 2010 Chesapeake Bay TMDL (total maximum daily load). Prohibits the Administrator from revising, for purposes of application in such watershed, the definitions of: (1) "storm water discharge associated with industrial activity" in regulations concerning storm water discharges in the EPA administered NPDES program, and (2) "concentrated animal feeding operation" in regulations concerning the EPA administered NPDES program. Prohibits the Administrator from requiring a permit under…