Water:
American Water Works Association: www.awwa.org
Wastewater:
Water Environment Federation: www.wef.org
State Regulatory:
Kansas Department of Health and Environment: www.kdhe.state.ks.us
Missouri Department of Natural Resources: www.dnr.mo.gov
Iowa Department of Natural Resources: www.iowadnr.com
Illinois Department of Natural Resources: dnr.state.il.us
Federal:
US Environmental Protection Agency: www.epa.gov
Center for Disease Control: www.cdc.gov
US Geological Survey: water.usgs.gov