; and (iii) for the purposes described in subsection (a)(2)(G). (B) Allotment The amounts described in subparagraph (A) shall be allotted to a State— (i) for each of fiscal years 2021 and 2022, as if allotted under subsection (a)(1)(D); and (ii) for each of fiscal years 2023 through 2029, in accordance with the regulations promulgated under subparagraph (C). (C) Rulemaking Not later than 2 years after the date of enactment of this subparagraph, the Administrator shall promulgate regulations for the distribution of amounts described in subparagraph (A) among States in a manner that accounts for the prevalence and remedial costs of addressing emerging contaminants, with a focus on perfluoroalkyl and po­ly­fluo­ro­al­kyl substances. ; and (B) in paragraph (2), by striking this subsection and all that follows through the period at the end and inserting the following: this subsection, to remain available until expended— (A) for fiscal year 2020— (i) $1,000,000,000; and (ii) any additional amount as may be designated by Congress as being for an emergency requirement pursuant to section 251(b)(2)(A)(i) of the Balanced Budget and Emergency Deficit Control Act of 1985 ( 2 U.S.C. 901(b)(2)(A)(i) ); and (B) for each of fiscal years 2021 through 2029, $1,000,000,000. . 3. Remediation of contamination of groundwater by perfluoroalkyl substances Title V of the Federal Water Pollution Control Act is amended— (1) by redesignating section 520 ( 33 U.S.C. 1251 note) as section 521; and (2) by inserting after section 519 ( 33 U.S.C. 1377a ) the following: 520. Remediation of contamination of groundwater by perfluoroalkyl substances (a) Definitions In this section: (1) Contaminated site The term contaminated site means a site at which groundwater has been contaminated by a covered perfluoroalkyl substance. (2) Covered perfluoroalkyl substance The term covered perfluoroalkyl substance means— (A) perfluorooctanoic acid (commonly referred to as PFOA ) (Chemical Abstracts Service No. 335–67–1)