This guide is intended to help citizens of Illinois find information about Illinois water supplies. It includes information resources from the state and federal government, news sources, and library holdings, including digital collections.
Lake Michigan Water Allocation ProgramIllinois Lake Michigan Water Allocation Program (Program) is implemented by the Illinois Department of Natural Resources Office of Water Resources' Lake Michigan Management Section
Domestic Well and Other Groundwater Data (aquifer maps, ISWS)Data provided by the Illinois State Water Survey's Groundwater Information program, which has on file more than 3.5 million hydrologic records, including water well construction records and information on groundwater quality and quantity.Users must register, and there are restrictions on some data. Individual well owners can obtain data on their own well free of charge. More extensive data provided on a fee basis.
ILWATER - Illinois Water Well Internet Map ServiceOn-line database of over 275,000 Illinois water and related well records, with a map interface, provided by the Illinois State Geological Survey (ISGS). Use the map to find a well number and basic info about the well. Additional information about wells can be requested from the Geological Records Unit (http://isgs.illinois.edu/geological-records-unit) at the Illinois State Geological Survey by using the well number.
ISGS Geological Records UnitThe Geological Records Unit (GRU) is the state repository for drilling records as mandated by statute. The collections include records for more than 500,000 oil and gas wells, water wells, engineering borings, and miscellaneous test holes drilled in Illinois. Copies of paper records may be obtained for a copying fee.