20220210 18285100 1.0 TRUE Major bedrock aquifers greater than 500 feet below ground surface. Groundwater quality with in deep major bedrock aquifers degrades from northwest to southeast in the northern portion of Illinois, due to the regional inclination of geological unit toward the center of the Illinois Basin in southeastern Illinois. aquifer groundwater water hydrology hydrogeology bedrock Illinois Major Bedrock Aquifers at Depths Greater Than 500 Feet Below Ground Surface Illinois State Geological Survey Major Bedrock Aquifers at Depths Greater Than 500 Feet Below Ground Surface 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