The Emergency Planning and Community Right-to-Know Act (EPCRA) establishes requirements and a framework to ensure that the U.S. Environmental Protection Agency (EPA), state and local governments, and the private sector will work together to control and, if necessary, respond to releases of hazardous chemicals to the environment. This report describes key provisions of EPCRA. In addition, it provides several references for more detailed information about the act, and a table that cross-references sections of the U.S. Code with corresponding sections of the act. The report highlights key provisions rather than providing a comprehensive inventory of the act's numerous sections, and addresses authorities and limitations imposed by the statute, rather than the status of implementation or other policy issues. The sudden, accidental release in December 1984 of methyl isocyanate in an industrial incident at the Union Carbide plant in Bhopal, India, and the attendant loss of thousands of lives and widespread injuries motivated many in Congress to support legislation to reduce the risk of chemical accidents in the United States. The Emergency Planning and Community Right-to-Know Act (42 U.S.C. 11001-11050) was enacted in 1986 as Title III of the Superfund Amendments and Reauthorization Act ( P.L. 99-499 ). EPCRA established state commissions and local committees to develop and implement procedures for coping with releases of hazardous chemicals, and mandated annual reporting to government officials on environmental releases of such chemicals by the facilities that manufacture or use them in significant amounts. EPA facilitates planning, enforces compliance when necessary, and provides public access to information about environmental releases of toxic chemicals. EPCRA established a national framework for EPA to mobilize local government officials, businesses, and other citizens to plan ahead for possible chemical accidents in their communities. Subtitle A requires local planning to respond to sudden releases of chemicals that might occur in the event of a spill, explosion, or fire. It is intended to ensure that responsible officials will know what hazardous chemicals are used or stored by local businesses and will be notified quickly in the event of an accident. Under Section 301, each state is required to create a State Emergency Response Commission (SERC), to designate emergency planning districts, and to establish local emergency planning committees (LEPCs) for each district. Section 302 requires EPA to list extremely hazardous substances and to establish threshold planning quantities for each substance. Originally, Congress defined chemicals as "extremely hazardous substances" if they appeared on a list EPA published in November 1985 as Appendix A in "Chemical Emergency Preparedness Program Interim Guidance." However, EPA has authority to revise the list, and the threshold quantities of chemicals. Based on listing criteria, the intent appears to be to include only chemicals in quantities that could harm people exposed to them for only a short period of time. The law directs each facility to notify the LEPC for its district if it stores or uses any "extremely hazardous substance" in excess of its threshold planning quantity. Section 303 directs LEPCs to work with facilities handling specified "extremely hazardous substances" to develop response procedures, evacuation plans, and training programs for people who will be the first to respond in the event of an accident. Upon request, facility owners and operators are required to provide an LEPC with any additional information that it finds necessary to develop or implement an emergency plan. Section 304 requires that facilities immediately report a release of any "extremely hazardous substance" or any "hazardous substance" (a much broader category of chemicals defined under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) Section 102(a)) that exceeds the reportable quantity to appropriate state, local, and federal officials. Releases of a reportable quantity of a "hazardous substance" also must be reported to the National Response Center under CERCLA Section 103(a). (For more on CERCLA, see CRS Report RL30798, Environmental Laws: Summaries of Major Statutes Administered by the Environmental Protection Agency , coordinated by [author name scrubbed], which includes a summary of CERCLA.) Subtitle B establishes various reporting requirements for facilities. The information collected may be used to develop and implement emergency plans, as well as to provide the public with general information about chemicals to which they may be exposed. The Occupational Health and Safety Act of 1970 (OSHAct) requires most employers to provide employees with access to a material safety data sheet (MSDS) for any "hazardous chemical." This "right-to-know" law for workers aims to ensure that people potentially exposed to such chemicals have access to information about the potential health effects of exposure and how to avoid them. EPCRA, Section 311, requires facilities covered by OSHAct to submit an MSDS for each "hazardous chemical" or a list of such chemicals to the LEPC, the SERC, and the local fire department. EPA has authority to establish categories of health and physical hazards and to require facilities to list hazardous chemicals grouped by such categories in their reports. An MSDS need only be submitted once, unless there is a significant change in the information it contains. An MSDS must be provided in response to a request by an LEPC or a member of the public. "Hazardous chemicals" are defined by the Code of Federal Regulations , Title 29, at Section 1910.1200(c). EPCRA, Section 312, requires the same employers to submit annually an emergency and hazardous chemical inventory form to the LEPC, SERC, and local fire department. These forms must provide estimates of the maximum amount of the chemicals present at the facility at any time during the preceding year; estimates of the average daily amount of chemicals present; and the general location of the chemicals in the facility. Information must be provided to the public in response to a written request. EPA is authorized to establish threshold quantities for chemicals below which facilities are not required to report. Section 313 mandates development of the Toxic Release Inventory (TRI), a computerized EPA database of "toxic chemical" releases to the environment by manufacturing facilities. It requires manufacturing facilities that manufacture, use, or process "toxic chemicals" to report annually to EPA on the amounts of each chemical released to each environmental medium (air, land, or water) or transferred off-site. EPA makes TRI data available in "raw" and summarized forms to the general public. The public may obtain specific information (e.g., about a particular manufacturing facility) by submitting a request in writing to EPA. EPA distributes written and electronic, nationwide and state-by-state summaries of annual data. Raw data and summaries also are available over the Internet. EPCRA, Section 313, generally requires a report to EPA and the state from each manufacturer with 10 or more employees and who either uses 10,000 pounds or manufactures or processes 25,000 pounds of any "toxic chemical" during the reporting year. However, EPA may adjust (and has adjusted in the past) these thresholds for classes of chemicals or categories of facilities. EPCRA enumerates the following data reporting requirements for each covered chemical present at each covered facility: whether it is manufactured, processed, or otherwise used, and the general category of use; the maximum amount present at each location during the previous year; treatment or disposal methods used; and the amount released to the environment or transferred off-site for treatment or disposal. EPCRA requires reporting by manufacturers, which the law defines as facilities in Standard Industrial Classification codes 20 through 39. The law authorized EPA to expand reporting requirements to additional industries. EPA promulgated a rule May 1, 1997, requiring reports on toxic releases from seven additional industrial categories, including some metal mining, coal mining, commercial electric utilities, petroleum bulk terminals, chemical wholesalers, and solvent recovery facilities (62 Federal Register 23834). The original statute specified 313 "toxic chemicals" or categories of chemicals for which reporting was required, but EPCRA gave EPA authority to add or delete chemicals from the list either on its own initiative, or in response to citizen petitions. EPA has removed more than 15 and added a few hundred so that the current list includes 666 individual chemicals. The listing criteria specified in Section 313(d)(2) authorize EPA to add a chemical when it is "known to cause or can reasonably be anticipated to cause" the following: "significant adverse acute human health effects at concentration levels that are reasonably likely to exist beyond facility site boundaries as a result of continuous, or frequently recurring, releases"; in humans—cancer, birth defects, or serious or irreversible chronic health effects; or "because of—i) its toxicity, ii) its toxicity and persistence in the environment, or iii) its toxicity and tendency to bioaccumulate in the environment, a significant adverse effect on the environment of sufficient seriousness, in the judgment of the Administrator, to warrant reporting under this Section." Subtitle C contains various general provisions, definitions, and authorizations. Section 322 authorizes reporting facilities to withhold the identity of a chemical if it is a trade secret, and they follow procedures established by EPA. Special provisions are made in Section 323 for informing health professionals of a chemical identity that has been withheld to protect confidential business information, if the information is needed to diagnose or treat a person exposed to the chemical. Section 324 directs EPA, governors, SERCs, and LEPCs to make emergency response plans, MSDSs, lists of chemicals, inventory forms, toxic chemical release forms, and follow-up emergency notices available to the general public. Section 325 establishes civil, administrative, and criminal penalties for noncompliance with mandatory provisions of the act. Citizens are given the authority to bring civil action against a facility, EPA, a governor, or an SERC by Section 326. Chemicals being transported or stored incident to transport are not subject to EPCRA requirements, according to Section 327. Section 328 authorizes EPA to issue regulations. Definitions are provided in Section 329.