CFR›Title 40›Chapter I›Part 425›Subject Group General Provisions ContainsSections 425.01–425.06CorpusDaily eCFRDisplayed edition2026-08-31Last updated2026-08-31 Sections 425.01 § 425.01 Applicability. 425.02 § 425.02 General definitions. 425.03 § 425.03 Sulfide analytical methods and applicability. 425.04 § 425.04 Applicability of sulfide pretreatment standards. 425.05 § 425.05 Compliance dates. 425.06 § 425.06 Monitoring requirements. Previous F Subpart F—Through-the-Blue Subcategory