IIOA
Indiana Industrial Operators Association
http://www.iioa.net/

Indiana Water Environment Association,
(Formerly Indiana Water Pollution Control Association)
http://www.indianawea.org/

Indiana Dept. of Environmental Management
http://www.in.gov/idem/

Indiana Dept. of Natural Resources
http://www.state.in.us/dnr/

United States Environmental Protection Agency, Water
http://www.epa.gov/water/

United States Environmental Protection Agency,
Categorical Effluent Guidelines and Information
http://www.epa.gov/ost/guide