StacksVerified U.S. regulatory reference

40 CFR §143.18

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Solder and flux that is not “lead free” as defined in § 143.12(a)(1) must bear a prominent label stating that it is illegal to use the solder or flux in the installation or repair of any plumbing providing water for human consumption.