Data on 24 chemical constituents or properties obtained from 766 wells in the Kansas ground-water quality monitoring network between 1976 and 1981 are statistically summarized in this report prepared in cooperation with the Kansas Department of Health and Environment. Minimum, median, and maximum concentrations and percentage of samples above the ' maximum contaminant levels ' established by the U.S. Environmental Protection Agency are presented for all wells in the statewide network. More detailed areal statistical summaries are presented for all wells in the statewide network. More detailed areal statistical summaries are presented for nine chemical constituents for which more than 3% of the observed concentrations exceeded the ' maximum contaminate level ' for that constituent. The State was divided into 14 ground-water regions based on water-use and physiographic characteristics. Summaries for these nine constituents include quartile values and percentage of samples with concentrations above the ' maximum contaminant level '...