Major Bedrock Aquifers Within 500 Feet of Ground Surface [Illinois]
Illinois State Geological Survey
Full Details
- Title
- Major Bedrock Aquifers Within 500 Feet of Ground Surface [Illinois]
- Description
- This map shows the distribution of major bedrock aquifer units within 500 feet of ground surface in Illinois. ��Major aquifers are capable of yielding 70 gallons of water per minute. ��Potable water contains less than 2,500 milligrams per liter of total dissolved solids. ��Bedrock aquifers within 500 feet of ground surface cover most of northern Illinois and are commonly overlain only by thin layers of less permeable silts and clays. ��Many are directly overlain by shallow or major sand and gravel aquifers allowing direct hydrologic communication with shallower aquifer systems. �� This feature class is intended to identify areas of Illinois where major bedrock aquifers exist. �� The scale of these data is 1:500,000.
- Creator
- Illinois State Geological Survey
- Access Rights
- Public
- Format
- File
- Language
- English
- Date Added
- August 28, 2025
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