Central Region Groundwater Protection Committee (Mason, Peoria, Tazewell & Woodford Counties)
National Ground Water Association
National Well Owners Association
Pesticides in Ground Water References
USEPA Office of Ground Water & Drinking Water
USGS Glossary of Water Science Terms
USGS Geologic Investigations Series Maps I-2669, 3D Geologic Maps of Quaternary Sediments in East-Central Illinois
USGS Illinois District
USGS National Geospatial Data Clearinghouse - General Information
USGS Circular 1139: Ground Water and Surface Water-- A Single Resource
USGS Circular 1186: Sustainability of Ground-Water Resources
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USGS Circular 1217: Ground-Water-Level Monitoring and the Importance of Long-Term Water-Level Data
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