(A) GOALS AND REGULATIONS FOR CERTAIN CONTAMINANTS.-In the case of those contaminants listed in the Advance Notice of Proposed Rulemaking published in volume 47, Federal Register, page 9352, and in volume 48, Federal Register, page 45502, the Administrator shall publish maximum contaminant level goals and promulgate national primary drinking water regulations

(i) not later than 12 months after June 19, 1986, for not less than 9 of the listed contaminants;

(ii) not later than 24 months after June 19, 1986, for not less than 40 of the listed contaminants; and

(iii) not later than 36 months after June 19, 1986, for the remainder of the listed contaminants.

(B) SUBSTITUTION OF CONTAMINANTS.-If the Administrator identifies a drinking water contaminant the regulation of which, in the judgment of the Administrator, is more likely to be protective of public health (taking into account the schedule for regulation under subparagraph (A)), the Administrator may publish a maximum contaminant level goal and promulgate a national primary drinking water regulation for the identified contaminant in lieu of regulating the contaminant referred to in such subparagraph. There may be no more than 7 contaminants in subparagraph (A) for which substitutions may be made. Regulation of a contaminant identified under this subparagraph shall be in accordance with the schedule applicable to the contaminant for which the substitution is made. (2) DISINFECTANTS AND DISINFECTION BYPRODUCTS.—

(A) PROPOSED GOALS AND REGULATION.-Not later than May 31, 1994, the Administrator shall propose maximum contaminant level goals or maximum residual disinfectant level goals, and a national primary drinking water regulation, for disinfectants and disinfection byproducts (including maximum residual disinfectant levels). The Administrator shall also propose an interim enhanced surface water treatment rule for systems serving a population of more than 10,000 that includes a maximum contaminant level goal for cryptosporidium. The proposed regulation shall be consistent with the "Disinfection and Disinfection Byproducts Negotiated Rulemaking Committee Agreement".

(B) STAGE I REGULATION.-Not later than December 31, 1996, the Administrator shall, after notice and opportunity for public comment, publish maximum contaminant level goals or maximum residual disinfectant level goals, and promulgate a revised national primary drinking water regulation for disinfectants and disinfection byproducts (including maximum residual disinfectant levels) and an interim enhanced surface water treatment rule for systems serving a population of more than 10,000 for microbial contaminants, including cryptosporidium.

(C) INFORMATION COLLECTION RULE.-Not later than July 29, 1994, the Administrator shall, after notice and opportunity for comment, promulgate an information collection rule to obtain information that will facilitate further

revisions to the national primary drinking water regulation for disinfectants and disinfection byproducts, including information on microbial contaminants such as cryptosporidium.

(D) PROPOSED RULE.-Not later than June 30, 1997, the Administrator shall propose a long-term enhanced surface water treatment rule for all public water systems (including any appropriate revisions to the interim regulations for public water systems serving a population of more than 10,000) promulgated pursuant to subparagraph (B).

(E) FINAL RULE.-Not later than December 31, 1998, the Administrator shall promulgate a long-term enhanced surface water treatment rule for all public water systems (including any appropriate revisions to the interim regulations for public water systems serving a population of more than 10,000) promulgated pursuant to subparagraph (B).

(F) STAGE II REGULATION.-Not later than June 30, 2000, the Administrator shall, after notice and opportunity for comment, promulgate a revised national primary drinking water regulation for disinfectants and disinfection byproducts taking into account the information collected under subparagraph (C). To the extent practicable, the Administrator shall develop the revised national primary drinking water regulation through the negotiated rulemaking procedure provided for under subchapter III of chapter 5 of title 5, United States Code.

[(3)(A) The Administrator shall publish maximum contaminant level goals and promulgate national primary drinking water regulations for each contaminant (other than a contaminant referred to in paragraph (1) or (2) for which a national primary drinking water regulation was promulgated) which, in the judgment of the Administrator, may have any adverse effect on the health of persons and which is known or anticipated to occur in public water systems. Not later than January 1, 1988, and at 3-year intervals thereafter, the Administrator shall publish a list of contaminants which are known or anticipated to occur in public water systems and which may require regulation under this Act.

[(B) For the purpose of establishing the list under subparagraph (A), the Administrator shall form an advisory working group including members from the National Toxicology Program and the Environmental Protection Agency's Offices of Drinking Water, Pesticides, Toxic Substances, Ground Water, Solid Waste and Emergency Response and any others the Administrator deems appropriate. The Administrator's consideration of priorities shall include, but not be limited to, substances referred to in section 101(14) of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980, and substances registered as pesticide under the Federal Insecticide, Fungicide, and Rodenticide Act.

[(C) Not later than 24 months after the listing of contaminants under subparagraph (A), the Administrator shall publish proposed maximum contaminant level goals and national primary drinking water regulations for not less than 25 contaminants for the list established under the subparagraph (A).

[(D) Not later than 36 months after the listing of contaminants under subparagraph (A), the Administrator shall publish a maximum contaminant goal and promulgate a national primary drinking water regulation for those contaminants for which proposed maximum contaminant level goals and proposed national primary drinking water regulations were published under subparagraph (C).]

(3) IDENTIFICATION OF CONTAMINANTS FOR LISTING.

(A) GENERAL AUTHORITY.—The Administrator shall publish a maximum contaminant level goal, and promulgate a national primary drinking water regulation, for each contaminant (other than a contaminant referred to in paragraph (1) or (2) for which a national primary drinking water regulation has been promulgated) if, in the judgment of the Administrator, the contaminant may have an adverse effect on the health of persons and the contaminant is known or anticipated to occur in public water systems with a frequency and at levels of public health concern. (B) CONTAMINANTS TO BE CONSIDERED.

(i) INITIAL LIST.-Not later than 3 years after the date of enactment of the Safe Drinking Water Act Amendments of 1994, the Administrator shall publish a list of not fewer than 15 contaminants that, in the judgment of the Administrator, present the greatest public health concern, based on available information with respect to the adverse health effects associated with the contaminants and the known or anticipated occurrence of the contaminants in public water sys

tems.

(ii) SUBSEQUENT LISTS.-Not later than 5 years after the date of publication of the initial list under clause (i), and every 5 years thereafter, the Administrator shall publish a list of not fewer than 7 additional contaminants meeting the criteria set forth in clause (i).

(iii) COMMENT.-The Administrator shall seek comment on each of the lists required under clauses (i) and (ii) prior to publication of each list from officials of State and local governments, operators of public water systems, the scientific community, and the general public.

(iv) LIST OF CONTAMINANTS.-Each of the contaminants listed pursuant to clause (ii) shall be on the list of contaminants established pursuant to to section 1445(a)(2)(B).

(v) PROPOSED WORK PLANS.-Proposed work plans, including schedules and milestones, for meeting the requirements of subparagraphs (C), (D), and (E) shall be published at the time a list is published under this subparagraph.

(C) PROPOSED GOAL AND REGULATION.-Not later than 18 months after the date on which a contaminant has been listed pursuant to subparagraph (B), the Administrator shall publish a maximum contaminant level goal, and pro

pose a national primary drinking water regulation, for the contaminant, unless the Administrator determines that

(i) adequate data are not available to develop the regulation; or

(ii) the contaminant does not meet the criteria for regulation established in subparagraph (A).

A determination that adequate data are not available, or that the contaminant does not meet the criteria for regulation, shall be a final agency action for purposes of section 1448.

(D) FINAL WORK PLAN FOR INFORMATION.-Not later than 18 months after the date on which a contaminant is listed pursuant to subparagraph (B) and for each of the contaminants for which a national primary drinking water regulation is not proposed pursuant to subparagraph (C)(i), the Administrator shall publish a final work plan with respect to the contaminant for collecting information and conducting studies necessary for development of a national primary drinking water regulation for the contaminant.

(E) PUBLICATION OF GOAL AND REGULATION OR DETERMINATION. After the completion of studies for a contami nant identified in a work plan under subparagraph (D), but not later than 5 years after a contaminant is first listed under subparagraph (B), the Administrator shall publish—

(i) a maximum contaminant level goal and propose a national primary drinking water regulation for the contaminant; or

(ii) a determination that the contaminant does not meet the criteria for regulation under subparagraph (A).

A determination under clause (ii) shall be a final agency action for purposes of section 1448.

(F) ISSUANCE OF REGULATIONS.-The Administrator shall promulgate a national primary drinking water regulation for each contaminant for which a regulation is proposed under this paragraph not later than 24 months after the date on which the regulation is proposed.

(G) URGENT THREATS TO PUBLIC HEALTH.-The Administrator may promulgate a national primary drinking water regulation for a contaminant using procedures other than the procedures specified in subparagraphs (B) through (F) to address an urgent threat to public health.

(H) MONITORING DATA AND OTHER INFORMATION.—The Administrator may require, in accordance with section 1445(a)(2), the submission of monitoring data and other information necessary for the development of studies, work plans, or national primary drinking water regulations. (1) NATIONAL DRINKING WATER OCCURRENCE DATA BASE.

(i) IN GENERAL.-Not later than 3 years after the date of enactment of the Safe Drinking Water Act Amendments of 1994, the Administrator shall assemble and maintain a national drinking water occurrence data base, using information on the occurrence of both

regulated and unregulated contaminants in public water systems obtained under section 1445(a) and information from other public and private sources.

(ii) USE.-The data shall be used by the Administrator in making determinations under this section with respect to the occurrence of a contaminant in drinking water at a level of public health concern.

(iii) PUBLIC RECOMMENDATIONS.-The Administrator shall periodically solicit recommendations from the appropriate officials of the National Academy of Sciences, and any person may submit recommendations to the Administrator, with respect to contaminants that should be included in the national drinking water occurrence data base, including recommendations with respect to additional unregulated contaminants that should be listed under section 1445(a)(2).

(iv) PUBLIC AVAILABILITY.-The information from the data base shall be available to the public in readily accessible form.

(v) REGULATED CONTAMINANTS.-With respect to each contaminant for which a national primary drinking water regulation has been established, the data base shall include information on the detection of the contaminant at a quantifiable level in public water systems (including detection of the contaminant at levels not constituting a violation of the maximum contaminant level for the contaminant).

(vi) UNREGULATED CONTAMINANTS.-With respect to contaminants for which a national primary drinking water regulation has not been established, the data base shall include

(I) monitoring information collected by public water systems that serve a population of more than 10,000, as required by the Administrator under section 1445;

(II) monitoring information collected by the States from a representative sampling of public water systems that serve a population of 10,000 or less; and

(III) other appropriate monitoring information on the occurrence of the contaminants in public water systems that is available to the Adminis

trator.

(J) PRIOR REQUIREMENTS-The requirements of subparagraph (C) of this paragraph (as it existed before the amendment made by section 4(b) of the Safe Drinking Water Act Amendments of 1994), and any obligations to promulgate regulations not promulgated as of the date of enactment of such Act, are superseded by this paragraph and paragraph (2).

(4) [Each maximum] (A) IN GENERAL.—Each maximum contaminant level goal established under this subsection shall be set at the level at which no known or anticipated adverse effects on the health of persons occur and which allows an ade