USGS National Map
US EPA EnviroMapper
FEMA Flood Map Service Center
US Fish and Wildlife Service National Wetlands Inventory
IDEM
IDEM Remediation Closure Guidance
IDEM LUST
IDEM Virtual File Cabinet
USDA Web Soil Survey
IDNR Water Wells
NIOSH Pocket Guide to Chemical Hazards
Agency For Toxic Substance and Disease Registry