About The Illinois State Water Survey

Groundwater Science

City of Decatur Groundwater Monitoring Network

The City of Decatur maintains a groundwater monitoring well network in southeastern DeWitt, northeastern Macon, and western Piatt counties to monitor groundwater levels in the Mahomet aquifer and overlying Glasford aquifer. This monitoring well network was established in 1989 during construction of Decatur's emergency supply well fields. The purpose of the network is to monitor water levels when the City of Decatur uses the well field under emergency use, but also serves as a valuable record of seasonal and long-term changes in the Mahomet aquifer. In 2020, the City of Decatur partnered with the Illinois State Water Survey to install pressure transducers within two of the observation wells. The transducers report water levels in near real-time on an hourly basis. Tracking water levels long-term provides valuable information on aquifer conditions and whether current demands on the aquifer are outpacing recharge to the system. This information will be important as the aquifer becomes relied upon more for domestic, municipal, and irrigation use.

The following wells are equipped with real-time data or are measured periodically. Click on a well to view the hydrograph and download the data. All wells are open to the Mahomet aquifer unless noted.

Real-Time Monitoring Wells

Periodic Monitoring Wells

Relevant ISWS Publications


Illinois State Water Survey

2204 Griffith Dr., MC-674
Champaign, IL 61820-7463
Email us with questions or comments.


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