CFR›Title 40›Chapter I›Part 141›Subpart U ContainsSections 141.600–141.605CorpusDaily eCFRDisplayed edition2026-04-27Last updated2026-04-27 Subpart U—Initial Distribution System Evaluations Sections 141.600 § 141.600 General requirements. 141.601 § 141.601 Standard monitoring. 141.602 § 141.602 System specific studies. 141.603 § 141.603 40/30 certification. 141.604 § 141.604 Very small system waivers. 141.605 § 141.605 Subpart V compliance monitoring location recommendations. Source71 FR 483, Jan. 4, 2006, unless otherwise noted. Previous T Subpart T—Enhanced Filtration and Disinfection—Systems Serving Fewer Than 10,000 People Next V Subpart V—Stage 2 Disinfection Byproducts Requirements