The U.S. Environmental Protection Agency (EPA) today is taking final action on changes proposed on October 22, 1993 to reportable quantities (RQs) for hazardous substances under the Comprehensive Environmental Response, Compensation, and Liability Act. The person in charge of a facility or vessel from which a hazardous substance is released in excess of its RQs must notify appropriate authorities, who can then evaluate whether a response is needed. This rule revises the table of hazardous substances to add 47 individual Clean Air Act hazardous air pollutants; adjust their statutory one-pound RQs; add five other Clean Air Act hazardous air pollutants that are categories of substances and assign no RQ to the categories; and adjust RQs for 11 Resource Conservation and Recovery Act hazardous wastes. EPA also is making conforming changes to the Clean Water Act table of hazardous substances and the Emergency Planning and Community Right-to-Know Act tables of extremely hazardous substances. EPA thoroughly evaluated the intrinsic properties of these substances to determine appropriate levels for the adjusted RQs; thus, this rule reflects a sound, scientific approach. The RQ adjustments are consistent with the Agency's common sense goals in that the rule will minimize net reporting and recordkeeping burdens. The rule results in an estimated net cost savings to industry and government of approximately $500,000 annually.