Congress enacted the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA; P.L. The Environmental Protection Agency (EPA) administers the program. CERCLA established a broad liability scheme that holds both past and current owners and operators of contaminated facilities financially responsible for the costs of cleanup. At waste disposal sites, generators of the waste sent to the site for disposal, and transporters of the waste who selected the site for disposal, also are responsible for the cleanup costs. A combination of special taxes on industry and revenues from the General Fund of the U.S. Treasury initially financed the Superfund Trust Fund, but the authority to collect the industry taxes expired at the end of 1995. As the remaining revenues were expended over time, Congress increased the contribution of general Treasury revenues in an effort to make up for the shortfall from the expired industry taxes. The availability of Superfund Trust Fund monies to finance the cleanup of contaminated sites is subject to appropriations by Congress. Considering the liability of the federal government as a potentially responsible party at its own facilities, the cleanup of federal facilities is not funded with Superfund Trust Fund monies under the Superfund program, but with other federal monies appropriated for other programs administered by the agencies responsible for these facilities. EPA and the states are responsible for overseeing and enforcing the implementation of CERCLA at federal facilities to ensure that applicable requirements are met. To prioritize cleanup actions, CERCLA directed EPA to establish and maintain a National Priorities List (NPL) of the most contaminated sites in the United States which present the greatest risks to human health and the environment. The topics discussed herein include the overall scope and reach of these statutory authorities, the process under which cleanup actions are selected and carried out at individual sites, the financial liability of potentially responsible parties for the costs of cleanup actions, the Superfund Trust Fund that may pay for cleanup actions when the potentially responsible parties cannot pay or cannot be found, enforcement of cleanup liability against the potentially responsible parties to minimize the need for federal tax revenues to finance the cleanup of contaminated sites, the applicability of CERCLA to federal facilities, and federal assistance for the cleanup of brownfields properties. In addition to providing relief from liability for certain categories of parties, P.L. Other federal laws also provide authorities to respond to petroleum releases in specific situations. Categories of Potentially Responsible Parties

Section 107(a) identifies four categories of potentially responsible parties who are liable for the costs of response actions, natural resource damages, and public health assessments associated with the release or threatened release of a hazardous substance:
any person who currently owns or operates a facility or vessel from which a hazardous substance was released; any person who at the time of disposal of a hazardous substance owned or operated the facility at which such disposal occurred; any person who arranged for the disposal or treatment of a hazardous substance (often referred to as a generator of waste), and any person who arranged for the transport of a hazardous substance for disposal or treatment; and any person who accepts or accepted a hazardous substance for transport to a disposal or treatment facility, incineration vessel, or site selected by such person. Reach of Liability

Over time, the courts have interpreted liability under Section 107 of CERCLA to be strict, joint and several, and retroactive. Congress has established other trust funds to address releases of petroleum. Interest also accrues on the trust fund balance. These private settlement funds are deposited into site-specific Special Accounts within the Superfund Trust Fund, which are dedicated to the cleanup of the sites covered under the settlements. These funds are available directly to EPA and are not subject to discretionary appropriations by Congress. Section 120 of the Superfund Amendments and Reauthorization Act of 1986 added Section 120 to CERCLA to clarify that federal departments and agencies are subject to the requirements of CERCLA to the same extent as other entities, including the liability and enforcement provisions of the law. States and local governments also may play a role in the cleanup of federal facilities listed on the NPL.
Congress enacted the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA; P.L. 96-510) in response to a growing desire for the federal government to ensure the cleanup of the nation's most contaminated sites to protect the public from potential harm. The Superfund Amendments and Reauthorization Act of 1986 (P.L. 99-499, SARA) clarified the applicability of the statute's requirements to federal facilities, and modified various response, liability, and enforcement provisions. Several other laws also have amended CERCLA for specific purposes, including relief from cleanup liability for certain categories of parties, and the authorization of federal assistance for the cleanup of abandoned or idled "brownfields" where the presence or perception of contamination may impede economic redevelopment.
CERCLA authorizes cleanup and enforcement actions to respond to actual or threatened releases of hazardous substances into the environment, but generally excludes releases of petroleum and certain other materials covered by other federal laws. Considering the limitation of federal resources to address the many contaminated sites across the United States, CERCLA directs the Environmental Protection Agency (EPA) to maintain a National Priorities List (NPL) to identify the most hazardous sites for the purpose of prioritizing cleanup actions. The states and the public may participate in federal cleanup decisions at NPL sites. The states primarily are responsible for pursuing the cleanup of sites not listed on the NPL, with the federal role at these sites limited mainly to addressing emergency situations.
CERCLA established a broad liability scheme that holds past and current owners and operators of facilities from which a release occurs financially responsible for cleanup costs, natural resource damages, and the costs of federal public health studies. At waste disposal sites, generators of the wastes and transporters of the wastes who selected the site for disposal also are liable under CERCLA. The liability of these "potentially responsible parties" (PRPs) has been interpreted by the courts to be strict, joint and several, and retroactive. At contaminated federal facilities, federal agencies are subject to liability under CERCLA as the owners and operators of those facilities on behalf of the United States. Federal agencies also may be liable in instances in which an agency generated or transported waste for disposal at a non-federal facility.
CERCLA established the Hazardous Substance Superfund Trust Fund to pay for the cleanup of sites where the PRPs cannot be found or cannot pay. A combination of special taxes on industry and general taxpayer revenues originally financed the Superfund Trust Fund, but the authority to collect the industry taxes expired on December 31, 1995. Over time, Congress increased the contribution of general revenues to make up for the shortfall from the expired industry taxes. General revenues now provide most of the funding for the trust fund, but other monies continue to contribute some revenues (i.e., cost-recoveries from PRPs, fines and penalties for violations of cleanup requirements, and interest on the trust fund balance). The availability of these trust fund monies under the Superfund program is subject to appropriations by Congress. Private settlement funds deposited into site-specific Special Accounts within the Superfund Trust Fund also are available to EPA, but are not subject to discretionary appropriations.
Considering the liability of the federal government at its own facilities, the cleanup of federal facilities is not funded with Superfund Trust Fund monies under the Superfund program, but with other federal monies appropriated to the agencies responsible for administering the facilities. However, EPA and the states remain responsible for overseeing and enforcing the implementation of CERCLA at federal facilities to ensure that applicable cleanup requirements are met.