PART 141 — NATIONAL PRIMARY DRINKING WATER REGULATIONS [ 40 CFR 141 ]PART141 — NATIONAL PRIMARY DRINKING WATER REGULATIONS [ 40 CFR141 ]Table of ContentsSubpart A — General§ 141.1 — Applicability.§ 141.2 — Definitions.[ Last FR update: 12/24/1975 ]§ 141.3 — Coverage.§ 141.4 — Variances and exemptions.[ Last FR update: 08/14/1998 ]§ 141.5 — Siting requirements.§ 141.6 — Effective dates.[ Last FR update: 05/22/2001 ]Subpart B — Maximum Contaminant Levels§ 141.11 — Maximum contaminant levels forinorganic chemicals.[ Last FRupdate: 01/22/2001 ]§ 141.12 — [Reserved]§ 141.13 — Maximum contaminant levels forturbidity.[ Last FR update:12/24/1975 ]Subpart C — Monitoring and AnalyticalRequirements§ 141.21 — Coliform sampling.[ Last FR update: 06/29/1989 ]§ 141.22 — Turbidity sampling and analyticalrequirements.[ Last FR update:05/04/2000 ]§ 141.23 — Inorganic chemical sampling andanalytical requirements.[Last FR update: 05/02/2012 ]...