Illinois Water Well (ILWATER) Interactive Map


The ISGS is an official repository for records of wells drilled in the state of Illinois in our Geoscience Information Stewardship Section. Paper records are archived for over 700,000 wells. Some of these records go back as far as the late 1800s. Water and related well data can be accessed for private water wells, engineering borings, and stratigraphic borings.  Many of the paper records have been converted to digital and are searchable within the ILWATER Interactive Map.

Desktop and Mobile Application in one!

The latest version of ILWATER runs plugin-free in any modern browser such as Google Chrome, Mozilla Firefox, Microsoft Edge, or Safari. This new version of ILWATER will also run responsively on a smartphone or browser.

Click this button to launch the new ILWATER!

Legacy Flash Application Still Available!

To ease the transition to the new application, the legacy Flash-based application will be available for a short time. Please visit Accessing Legacy Flash-based ISGS Interactive Maps to learn how to access the application.

Viewing Logs

BlueView is an application to display TIFF (Tagged Image File Format) log image raster files on a Windows system. It is specifically designed to handle the very long narrow images that logs generate.

BlueView Log Image Manipulation Software is offered for download from Schlumberger.

If you have any problems with any of the application functionality, desktop or mobile, please contact Melony E. Barrett by email ( or phone 217-333-7917

Related Information

Data Disclaimer  Data Policies and Procedures
How Well Locations Are Described
Formation Description Abbreviations(PDF)
Water Well Data Elements (PDF)

To purchase data, call the ISGS Geologic Records Unit at 217-333-5109.