USGS Ground Water Information System http://water.usgs.gov/ogw/

USGS Surface Water Information System http://water.usgs.gov/osw/

USGS Water Resources Software http://water.usgs.gov/software/

USGS Water Quality Information http://water.usgs.gov/owq/

USGS Water Data http://waterdata.usgs.gov/nwis

Consortium of Universities for the Advancement of Hydrologic Science http://www.cuahsi.org/index.html

Ohio EPA http://das.ohio.gov/phone/agency/epa.asp

Ohio Water Well Logs http://www.dnr.state.oh.us/water/maptechs/wellogs/app/

Geological Society of America (GSA) http://www.geosociety.org/

American Institute of Hydrology (AIH) http://www.aihydro.org/

International Association of Hydrogeologists (IAH) http://www.iah.org/

International Association of Environmental Hydrologists http://www.hydroweb.com/journal-hydrology.html

American Geophysical Union (AGU) http://www.agu.org/

National Ground Water Association (NGWA) http://www.ngwa.org/

Association of Ground Water Scientists and Engineers http://www.ngwa.org/membership/agwse.cfm

American Water Resources Association http://www.awra.org/