CFR›Title 40›Chapter I›Part 749 ContainsSubparts A–DCorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 PART 749—WATER TREATMENT CHEMICALS Subparts A-C Subparts A-C [Reserved] D Subpart D—Air Conditioning and Cooling Systems Section 749.68 Authority15 U.S.C. 2605 and 2607. Previous 747 Part 747—Metalworking Fluids Next 750 Part 750—Procedures for Rulemaking Under Section 6 of the Toxic Substances Control Act