Section was enacted as part of the Environmental Research, Development, and Demonstration Authorization Act of 1978, and not as part of the Public Health Service Act which comprises this chapter.

1978—Subsec. (a)(2). Pub. L. 95–477 inserted “agricultural use or” after “drinking and”.

Pub. L. 95–477, § 7(a)(2), Oct. 18, 1978, 92 Stat. 1511, provided that: “This subsection [amending this section] shall become effective October 1, 1978.”