PUBLIC LAW 104-182—AUG. 6, 1996 110 STAT. 1633 every 7 years, or upon receipt of a petition supported by substantial information, review variance technologies identified under this paragraph. The Administrator shall issue revised guidance or regulations if new or innovative variance technologies become available that meet the requirements of this paragraph and achieve an equal or greater reduction or inactivation efficiency than the variance technologies previously identified under this subparagraph. No public water system shall be required to replace a variance technology during the useful life of the technology for the sole reason that a more efficient varisuice technology has been listed under this subparagraph.", (b) AVAILABILITY OF INFORMATION ON SMALL SYSTEM TECH- NOLOGIES.— Section 1445 (42 U.S.C. 300J -4) is amended by adding the following new subsection after subsection (g): "(h) AVAILABILITY OF INFORMATION ON SMALL SYSTEM TECH- NOLOGIES.— For purposes of sections 1412(b)(4)(E) and 1415(e) (relating to small system variance program), the Administrator may request information on the characteristics of commercially available treatment systems and technologies, including the effectiveness and performance of the systems and technologies under various operating conditions. The Administrator may specify the form, content, and submission date of information to be submitted by manufacturers, States, and other interested persons for the purpose of considering the systems and technologies in the development of regulations or guidance under sections 1412(b)(4)(E) and 1415(e).". 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 nation^ 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"