Kane County, Illinois has been undergoing tremendous population growth. Its population was 404,119 in 2000 and is projected to grow to 710,000 by 2030. Because of current water resource limitations and in anticipation of much larger, future demands, the County has contracted with the Illinois State Water Survey (ISWS) and the Illinois State Geological Survey (ISGS) to assess its water resources. The results of this assessment will provide Kane County with the scientific basis for developing policies and management strategies for more effective management of its water resources. In 2002 the ISGS began geologic mapping of Quaternary deposits and shallow bedrock in Kane County with an emphasis on groundwater resources. Geologic interpretations have been made on records from 5,486 water wells, stratigraphic and engineering borings. The geologic interpretations were used to produce a three-dimensional geologic model of the county and a six mile wide buffer zone. Geologic cross sections and a depiction of the model with the lithostratigraphic layers separated have been produced. The model was queried to produce maps of Kane County at a scale 1:100,000, including maps of major Quaternary aquifers, aquifer sensitivity to contamination, and bedrock geology. Preliminary versions of these maps were accompanied by published reports describing the geology of the county and how the model and maps were produced. The intended purpose of these maps is for planning and guiding development at the county level. The maps provide a framework for smaller scale projects, but are not suitable for site-specific work. Also, the maps, cross sections and model depiction are useful as educational tools to aid the general public in understanding the geology and groundwater resources of the county.