Code of Federal Regulations Title 40. Protection of Environment § 40.503.3 Permits and direct enforceability

(1) Issued to a “treatment works treating domestic sewage”, as defined in 40 CFR 122.2, in accordance with 40 CFR parts 122 and 124 by EPA or by a State that has a State sludge management program approved by EPA in accordance with 40 CFR part 123 or 40  CFR part 501 or

(2) Issued under subtitle C of the Solid Waste Disposal Act;  part C of the Safe Drinking Water Act;  the Marine Protection, Research, and Sanctuaries Act of 1972;  or the Clean Air Act. “Treatment works treating domestic sewage” shall submit a permit application in accordance with either 40 CFR 122.21 or an approved State program.