About The Illinois State Water Survey

Illinois Water Supply Planning

Interactive Maps

Statewide Municipal Water Use and Water Purchase Interactive Map

Municipal Water Use Web App

There are over 1,300 communities throughout Illinois that rely on different sources of water for municipal, industrial, and residential use. Sources of water throughout the state include Lake Michigan, inland surface waters such as rivers and reservoirs, groundwater, or a combination of sources. Communities may also purchase water from other communities or from public water distributors. Public water distributors include private companies, water commissions, water districts, or water agencies.

This interactive map depicts the complexity of where communities get their water from and the network of water purchases throughout the state. Municipalities and public water distributors are colored according to the source of water they use. The purchase network depicts transactions between communities or public water distributors with arrows going from seller to purchaser. The arrows in no way represent water main or pipeline networks.

Some communities may extract water from their own wells or intakes (self-supplied water), may buy water from another community or public water distributor (purchased water), or may have a combination of self-supplied and purchased water. Water use listed in the pop-up boxes and in the attribute tables are in gallons/year and millions of gallons per day (MGD) as reported through the Illinois Water Inventory Program. The amounts of self-supplied and purchased water are for the year 2012 and will be updated as data sets are completed. Users should note that not all communities and public water distributors have reported in the year 2012. Users can also export data found in the attribute tables as a CSV file and can output maps in various formats for printing. Data sets are also available for download.

For questions or comments please contact Daniel Hadley by email drhadley@illinois.edu or phone, 217-300-0402.

Last Updated: 2/22/2017


Northeastern Illinois Shallow Bedrock Aquifer Interactive Map

Northeastern Illinois Shallow Bedrock Aquifer Web App

Prior to glaciation episodes in Illinois, the predominately carbonate bedrock exposed at the land surface in northeastern Illinois was subjected to weathering and dissolution. This resulted in the development of significant secondary porosity, particularly within the upper 125 feet of bedrock, creating a productive aquifer. We refer to this aquifer as the shallow bedrock carbonate aquifer. This aquifer is an important source of groundwater for municipalities, industry, and private homeowners throughout northeastern Illinois.

The potentiometric surface for the shallow bedrock carbonate aquifer represents groundwater elevation (head) in feet above mean sea level (AMSL) and is available to download. It is a composite of 1,461 water level measurements in wells taken between 1990 and 2006 as part of various Illinois State Water Survey (ISWS) studies, and an additional 231 surface water elevations along rivers and creeks where there is a hydraulic connection with the shallow bedrock aquifer.

Additional information about the data and methods used to construct the potentiometric surface can be found in Abrams et al., 2014. The bedrock geologic maps and glacial moraine maps depicted were developed by the Illinois State Geological Survey and are also available to download.

For questions or comments please contact Daniel Hadley by email drhadley@illinois.edu or phone, 217-300-0402.

Last Updated: 10/19/2016


Illinois Groundwater Resources

Illinois Groundwater Resources

Illinois has an abundance of groundwater resources that supply millions of gallons of water per day to public, irrigation, and commercial/industrial systems. Groundwater resources are unevenly distributed throughout Illinois due to the state’s complex bedrock and glacial geology. This interactive map depicts the three major aquifer systems in Illinois and the public water supply (PWS) wells that extract groundwater from them. Users can select or query wells based on spatial location or attribute, and then can view reported withdrawals in an attribute table or in graph view. Users can also export data found in the attribute tables as a CSV file and can output maps in various formats for printing.

The withdrawals reported in the attribute tables and graphs are the total withdrawals at each well in gallons/year and are reported through the Illinois Water Inventory Program. The latest complete dataset available for public water supplies is from 2013 and will be updated as they are finalized. Users should note that not all facilities have reported every year, therefore withdrawals may be missing at some wells for a particular year.

The three aquifer systems depicted are the major sand and gravel aquifers, the shallow bedrock aquifers, and the Cambrian-Ordovician sandstone aquifers. Aquifer maps developed by the Illinois State Geological Survey are available for download. Major aquifers are considered to be at least 50 square miles in area and are capable of yielding at least 70 gallons per minute to wells.

For questions or comments please contact Daniel Hadley by email drhadley@illinois.edu or phone, 217-300-0402.

Last Updated: 8/29/2016


Cambrian-Ordovician Sandstone Aquifer System of Illinois

This webmap is a repository for the latest data and model results for the Cambrian-Ordovician Aquifer System of Illinois, which includes three major aquifers: the St. Peter Sandstone, Ironton-Galesville Sandstone, and Mt. Simon Sandstone, along with one minor aquifer: the New Richmond Sandstone, primarily utilized where the St. Peter Sandstone is absent. Data and model results will be updated as newer data becomes available and are subject to change. Results outside of Illinois have not been verified for accuracy.

For questions or comments please contact Devin Mannix by email mannix@illinois.edu or phone, 217-244-2419.

Last Updated: 6/21/2018

Illinois State Water Survey

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