pipe activities contractors, persons engaged in remodeling and renovation, experts in lead health effects, and others. If the Administrator determines that a category of contractors engaged in renovation or remodeling does not require certification, the Administrator shall publish an explanation of the basis for that determination. 202. Identification of dangerous levels of lead Within 18 months after the enactment of this Act, the Administrator shall promulgate regulations which shall identify for purposes of this title lead-based pipe hazards. 203. Authorized State programs (a) Approval Any State which seeks to administer and enforce the standards, regulations, or other requirements established may, after notice and opportunity for public hearing, develop and submit to the Administrator an application, in such form as the Administrator shall require, for authorization of such a State program. Any such State may also certify to the Administrator at the time of submitting such program that the State program meets the requirements of paragraphs (1) and (2) of subsection (b). Upon submission of such certification, the State program shall be deemed to be authorized under this section, and shall apply in such State in lieu of the corresponding Federal program as the case may be, until such time as the Administrator disapproves the program or withdraws the authorization. (b) Approval or disapproval Within 180 days following submission of an application, the Administrator shall approve or disapprove the application. The Administrator may approve the application only if after notice and after opportunity for public hearing, the Administrator finds that— (1) the State program is at least as protective of human health and the environment as the Federal program as the case may be