; (ii) shall require the development of information relating to perfluoroalkyl and polyfluoroalkyl substances that the Administrator determines is likely to be useful in evaluating the hazard and risk posed by such substances in land, air, and water (including drinking water and water used for agricultural purposes), as well as in products; and (iii) may allow for varied or tiered testing requirements based on hazard characteristics or chemical properties of perfluoroalkyl and polyfluoroalkyl substances or categories of perfluoroalkyl and polyfluoroalkyl substances. (C) Deadlines The Administrator shall issue— (i) a proposed rule under subparagraph (A) not later than 6 months after the date of enactment of this paragraph; and (ii) a final rule under subparagraph (A) not later than 2 years after the date of enactment of this paragraph. . (b) Persons subject to rule Section 4(b)(3) of the Toxic Substances Control Act ( 15 U.S.C. 2603(b)(3) ) is amended— (1) in subparagraph (A), by striking subparagraph (B) or (C) and inserting subparagraph (B), (C), or (D)