Under the Superfund program, the EPA places the most seriously contaminated sites on the National Priorities List. EPA may compel site cleanups by parties responsible for contamination, or conduct cleanups itself and have these parties reimburse its costs. The program is funded by a trust fund, which is largely supported by general fund appropriations. This report examines: (1) EPA's enforcement action outcomes and the factors parties consider in reaching these outcomes; (2) any trends in litigation to resolve Superfund liability; and (3) the program's status and costs. The report obtained and analyzed Superfund program data from EPA, as well as data on Superfund litigation from cases filed in U.S. district courts. Includes recommendations. Illustrations.