CFR›Title 40›Chapter I›Part 143 ContainsSubparts A–BCorpusDaily eCFRDisplayed edition2026-04-27Last updated2026-04-27 PART 143—OTHER SAFE DRINKING WATER ACT REGULATIONS Subparts A Subpart A—National Secondary Drinking Water Regulations Sections 143.1–143.9 B Subpart B—Use of Lead Free Pipes, Fittings, Fixtures, Solder, and Flux for Drinking Water Sections 143.10–143.20 Authority42 U.S.C. 300f et seq.Source44 FR 42198, July 19, 1979, unless otherwise noted. Previous 142 Part 142—National Primary Drinking Water Regulations Implementation Next 144 Part 144—Underground Injection Control Program