United States Environmental Protection Agency – www.epa.gov
United States Geological Survey – www.usgs.gov
Ohio Environmental Protection Agency – www.epa.state.oh.us
Ohio Department of Natural Resources – www.dnr.state.oh.us
Ohio Water Professionals (OTCO, OAWWA, ORWA) – www.ohiowater.org
American Water Works Association – www.awwa.org
Water Environment Federation – www.wef.org