About The Illinois State Water Survey

Groundwater Science

Rock River Region: Water Supply Planning 

The Water Survey is conducting a scientific investigation into the water supply of the Rock River region, which includes Jo Daviess, Stephenson, Winnebago, Boone, Carroll, Ogle, Whiteside, Lee, Rock Island, Henry, and Bureau counties. Most of the region can use groundwater resources from two major aquifer systems: (1) sands and gravels, primarily in the Green River Lowlands; and (2) the Cambrian-Ordovician sandstone aquifer system, which ranges widely in depth in the region. Some smaller water supplies in this region also draw from shallower Silurian-Devonian or Galena Platteville bedrock.

Please note that all analyses on this page and associated story maps are under review by the regional planning committee and should be considered as provisional.


Rock River Region

Groundwater Resources Applications

Supply and Demand Analysis

The ISWS has calculated supply and demand at a county level for the entire Rock River Region. The above application breaks down demand based on type (public supply, industrial, agricultural, power generation). Supply is broken into source: groundwater and surface water.

The ISWS has also calculated supply and demand for the Cambrian-Ordovician Sandstone Aquifer for the entire state of Illinois. The above application explores those estimates.

Groundwater Risk Story Map


The above images redirects to a map showing risk at different levels in the Rock River Region. This includes risk for sandstone supply and municipal supplies where shallow aquifer transmissivity is limited. 

Illinois State Water Survey

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


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