Volatile organic chemical (VOC) detection data from public-supply wells in New Jersey were compared with information from a commercially available database of environmental risk sites (including underground storage tanks, reported chemical release sites, and other regulated sites). Two groups of wells (where VOCs were and were not detected) were tested for statistical differences with respect to population density and counts of 14 different types of risk sites located within one kilometer of the well. Preliminary results indicate that VOC detection is related to both population density and the occurrence of risk sites. Further analysis will focus on subgroups of VOCs and well characteristics.