CFR›Title 40›Chapter I›Part 141›Subpart E ContainsSections 141.40–141.42CorpusDaily eCFRDisplayed edition2026-10-26Last updated2026-10-26 Subpart E—Special Regulations, Including Monitoring Sections 141.40 § 141.40 Monitoring requirements for unregulated contaminants. 141.41 § 141.41 Special monitoring for sodium. 141.42 § 141.42 Special monitoring for corrosivity characteristics. Previous D Subpart D—Reporting and Recordkeeping Next F Subpart F—Maximum Contaminant Level Goals and Maximum Residual Disinfectant Level Goals