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. For records of known wells that exist on your property or project but do not appear in ILWATER, please contact Donna McCoy, (217) 333-8655, or email for possible paper records.

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

ILWATER interface

Groundwater Resources and Water Well Questions in General

Are you interested in building a new home in a rural area (with no access to public water) and are not sure about the groundwater potential? Have you already built a new home and ended up with a dry hole? Are you a farmer considering irrigation or wanting to expand a hog or cattle operation? Are you an engineer or consultant trying to find a new source of groundwater for a small community or rural water district? For questions such as these and others regarding groundwater resources in your area, different drilling methods, and well construction methods in general, please contact Jason Thomason, 217-244-2508, or email Please have your location ready (section, township and range preferably) and specify if you are interested in groundwater for domestic, agriculture, municipal (public) or industrial use. 

Illinois Water and Related Wells Web Mapping Applications (ILWATER)

ILWATER was last updated on November 10, 2015.  Updates include, but are not limited to, updating the API Number links to reflect a new Oracle database server, adding more selection tools (like point, line, and freehand lines and polygons), tooltips when you hover over Status, and some minor changes to filtering selections.  

Also added with this update was a mobile version.  Now when try to navigate to the ILWATER application on a mobile phone you will automatically be redirected to a mobile version.  The mobile version was created using Esri's Web AppBuilder.  If you can access the internet over a WiFi or cellular network, you can access the data you are used to accessing from your desktop using the mobile app.

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

The current ILWATER application was built using Esri ArcGIS for Server version 10.3,  Esri’s ArcGIS API for Flex version 3.7, and the Adobe Flex SDK 4.6.0.  The application software and hardware are updated as necessary to provide greater stability and more functionality for our users.

Browser Requirements

  • Your browser (Google Chrome, Mozilla Firefox, Internet Explorer, etc…) must have JavaScript enabled.
  • You must have the Adobe Flash Player installed on your computer.  Otherwise, you will be prompted to install it when you launch ILWATER.
  • If you continue to be prompted to install the Flash Player even though you have already installed it, try deleting the Flash Player Temp files.  (Hint:  Go to Control Panel > Flash Player.  In the Flash Player Settings Manager dialog box, click the Advanced tab, and then click the Delete All… button.  In the Delete All Site Data in Flash Player dialog box, check the box next to Delete All Site Data and Settings, and then click the Delete Data button.  Finally close the Flash Player Settings Manager.  Try launching ILWATER again.).
  • If you continue to experience difficulty installing the Adobe Flash Player, launching the ILWATER application, or accessing any of the links within the ILWATER application, please contact Melony Barrett.

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.