The National Pollutant Discharge Elimination System (NPDES)
http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfm

Construction Industry Compliance Assistance Center
http://www.cicacenter.org/stormwater.html

U.S. EPA Stormwater Topics
http://www.epa.gov/ebtpages/watestormwater.html

U.S. EPA Wastewater Topics
http://www.epa.gov/ebtpages/watewastewater.html

NPDES FAQs and General Information
http://cfpub.epa.gov/npdes/stormwater/const.cfm?program_id=6

State-by-State Resources Locator
http://www.envcap.org/statetools/index.cfm