STATE PRIMACY.

SEC. 112. STATE PRIMACY. (a) State Primary Enforcement Responsibility.— Section 1413 (42 U.S.C. 300g-2) is amended as follows: (1) In subsection (a), by amending paragraph (1) to read as follows: “(1) has adopted drinking water regulations that are no less stringent than the national primary drinking water regulations promulgated by the Administrator under subsections (a) and (b) of section 1412 not later than 2 years after the date on which the regulations are promulgated by the Administrator, except that the Administrator may provide for an extension of not more than 2 years if, after submission and review of appropriate, adequate documentation from the State, the Administrator determines that the extension is necessary and justified;”. (2) By adding at the end the following subsection: “(c) Interim Primary Enforcement Authority.— A State that has primary enforcement authority under this section with respect to each existing national primary drinking water regulation shall be considered to have primary enforcement authority with respect to each new or revised national primary drinking water regulation during the period beginning on the effective date of a regulation adopted and submitted by the State with respect to the new or revised national primary drinking water regulation in accordance with subsection (b)(1) and ending at such time as the Administrator makes a determination under subsection (b)(2)(B) with respect to the regulation.”. (b) Emergency Plans.— Section 1413(a)(5) (42 U.S.C. 300g-2(a)(5)) is amended by inserting after “emergency circumstances” 110 STAT. 1634the following: “including earthquakes, floods, hurricanes, and other natural disasters, as appropriate”.