Groundwater Data

Click here for a list of groundwater monitoring wells in Mason and Tazewell County with real time water level hydrographs.

Recent Updates

5/7/2026

The Illinois State Water Survey’s draft 2025 Annual Report is currently undergoing review. Please look for the final version after the June Board Meeting. For comments, please share them with Mike Krasowski at krasows2@illinois.edu.

5/6/2026

Board meetings will now take place at 7:00 PM on all scheduled meeting days.