The National Priorities List (NPL) is the priority list of hazardous waste sites in the United States eligible for long-term remedial investigation and remedial action (cleanup) financed under the federal Superfund program. Environmental Protection Agency (EPA) regulations outline a formal process for assessing hazardous waste sites and placing them on the NPL. The NPL is intended primarily to guide EPA in determining which sites are so contaminated as to warrant further investigation and significant cleanup.
As of 2021, 1322 sites are on the list, and 51 sites have been proposed for listing. 447 sites have been deleted from the list. The federal Superfund program was originally funded by a tax on oil and chemical companies. In 1995, Congress chose not to renew the tax and currently taxpayers pay for the cleanup of sites where there are no financially viable responsible parties.
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