Name: Major Rock Aquifers greater than 500 ft

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Description: This map shows the distribution of major bedrock aquifer units at depths greater than 500 feet below ground surface in Illinois. Major aquifers are capable of yielding 70 gallons of water per minute. The data are sub-divided into (1) aquifers yielding potable water (containing less than 2,500 milligrams per liter of total dissolved solids), (2) aquifers yielding water containing from 2,500 to 10,000 milligrams per liter of total dissolved solids, and (3) aquifers yielding water containing greater than 10,000 milligrams per liter of total dissolved solids. The map indicates that groundwater quality within deep major bedrock aquifers degrades from northwest to southeast in the northern portion of Illinois. This degradation in water quality is due to the regional inclination of geological units toward the center of the Illinois Basin in southeastern Illinois. Stratigraphic units considered to be major bedrock aquifers are: Hunton Limestone Megagroup Ancell Group Prairie du Chien Group Ironton-Galesville Sandstone Elmhurst-Mt. Simon Sandstone. The scale of these data is 1:500,000.

Copyright Text: Illinois State Geological Survey

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Spatial Reference: 102100  (3857)

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  Label: < 2500 mg/L Total Dissolved Solids
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