National drinking water regulations

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Title 42—THE PUBLIC HEALTH AND WELFARE > CHAPTER 6A—PUBLIC HEALTH SERVICE > SUBCHAPTER XII—SAFETY OF PUBLIC WATER SYSTEMS > Part B—Public Water Systems

This text was captured on Sep 9, 2026. It is a snapshot, not a live feed, so check the official code before relying on it.

Text

Effective on June 19, 1986 , each national interim or revised primary drinking water regulation promulgated under this section before June 19, 1986 , shall be deemed to be a national primary drinking water regulation under subsection (b). No such regulation shall be required to comply with the standards set forth in subsection (b)(4) unless such regulation is amended to establish a different maximum contaminant level after June 19, 1986 .

( July 1, 1944, ch. 373 , title XIV, § 1412, as added Pub. L. 93–523, § 2(a) , Dec. 16, 1974 , 88 Stat. 1662 ; amended Pub. L. 95–190 , §§ 3(c), 12(a), Nov. 16, 1977 , 91 Stat. 1394 , 1398; Pub. L. 99–339, title I, § 101(a) –(c)(1), (d), (e), June 19, 1986 , 100 Stat. 642–646 ; Pub. L. 104–182, title I , §§ 102(a), (c)(2), 103, 104(a), (c), 105–111(a), title V, § 501(a)(1), (2), Aug. 6, 1996 , 110 Stat. 1617 , 1621–1623, 1625–1631, 1691.)

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