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University Library, University of Illinois at Urbana-Champaign

Illinois Water Supply Information: Find Information on Your Drinking Water

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.

Drinking water alerts

To find boil orders and other drinking water alert information for public water supplies in your area start with your local public health department.

Where does my water come from?

Illinois drinking water may come from municipal water supplies or private wells, depending on where you live.  The tools below can help you identify the source of your water.

Maps and GIS Tools

University of Illinois at Urbana-Champaign Water Quality

What is in my water?

Water quality information is available from a variety of sources, depending on the type of supply.  The tools below can help you become informed about the quality of your water.

Water Source, Quality, and Quantity Data

Test Your Water