Reauthorization of the Superfund law continues to be a major source of controversy among political leaders and environmental activists. Some seek a major overhaul of the statute, arguing that considerable cleanup still needs to be done. Others oppose major changes, asserting that cleanup is almost complete. One of the most contentious issues in the debate is whether the taxes that once stocked the Superfund Trust Fund need to be reinstated. The answer depends in large part on how much money EPA will need to implement the Superfund program. To inform this discussion, the U.S. Congress asked Resources for the Future (RFF) to estimate the program's future costs. The results of this research are included in Superfund's Future, a book that will become an essential reference for all participants in the debate about one of the nation's most controversial environmental programs.

The Superfund program of the US Environmental Protection Agency (EPA) was created in the 1980s to address human-health and environmental risks posed by abandoned or uncontrolled hazardous-waste sites. Identification of Superfund sites and their remediation is an expensive multistep process. As part of this process, EPA attempts to identify parties that are responsible for the contamination and thus financially responsible for remediation. Identification of potentially responsible parties is complicated because Superfund sites can have a long history of use and involve contaminants that can have many sources. Such is often the case for mining sites that involve metal contamination; metals occur naturally in the environment, they can be contaminants in the wastes generated at or released from the sites, and they can be used in consumer products, which can degrade and release the metals back to the environment. This report examines the extent to which various sources contribute to environmental lead contamination at Superfund sites that are near lead-mining areas and focuses on sources that contribute to lead contamination at sites near the Southeast Missouri Lead Mining District. It recommends potential improvements in approaches used for assessing sources of lead contamination at or near Superfund sites.