EPA announced March 17, 2011, that it will seek comments until May 16, on guidance the agency issued in November 2010 that recommended the use of numerical effluent limits in Clean Water Act permits for stormwater discharges. The guidance was intended to help state and local permitting authorities incorporate stormwater discharge limits into NPDES permits until EPA completes its stormwater rule.

EPA did not seek comments when the guidance was issued, but several interested parties subsequently contacted the agency asking for an opportunity to provide comments. EPA therefore decided to offer the opportunity. See EPA Press Release, March 17, 2011.