The Himco Dump is an unlined, 60 acre landfill northwest of Elkhart, Indiana that was used for disposal of commercial, industrial, and medical waste, and general refuse on the land surface or in 10–15 feet deep trenches from 1960 to 1976; it is listed on the US Environmental Protection Agency (USEPA) National Priority List (US Environmental Protection Agency 2002). The aquifer beneath the landfill is in unconsolidated glacial outwash deposits and is part of the St. Joseph aquifer system, a USEPA-designated sole-source aquifer. The aquifer typically is separated into upper and lower units by a confining unit of silt and clay; near the landfill the confining unit isabsent (Duwelius and Silcox 1991). Ground-water flow in the shallow aquifer near the landfill is south-southeast (Fig. 1) and toward the St. Joseph River (Duwelius and Silcox 1991) except for an area of south-southwesterly flow along the southern landfill boundary. A plume of leachaterelated bromide in ground water was mapped in 1980 and 1982 as extending about 1 mile south-southeast of the landfill toward a public-supply-well field (Duwelius and Silcox 1991). USEPA sampling from 1984 through 1995 detected volatile organic compounds (VOCs), semi-VOCs, and metals in water from wells at and near the landfill. Water from domestic wells in a neighborhood east of the landfill contained concentrations of benzene, chloroform, 1,2-dichloroethane, vinyl chloride, 1,1-dichloroethane, arsenic, sodium, and calcium that indicated leachate contamination. Ground water downgradient from the landfill was sampled in 2000 and 2002 for this study to identify whether waste-indicator and pharmaceutical compounds could be present in landfill-leachate-affected ground water.