eCFR Reference Browser

---

title: "40 CFR §57.401"

source: "https://www.ecfr.gov/current/title-40/section-57.401"

title_number: "40"

volume_number: "6"

chapter_number: "Unknown"

subchapter_code: "C"

subchapter_subject: "AIR PROGRAMS (CONTINUED)"

part_code: "57"

part_subject: "PRIMARY NONFERROUS SMELTER ORDERS"

subpart_code: "D"

subpart_subject: "Supplementary Control System Requirements"

section_number: "57.401"

section_subject: "General requirements."

cfr_reference: "40 CFR 57.401"

title_name: "Title 40"

title_subject: "Protection of Environment"

parts_covered: "Parts 53 to 59"

revised_date: "Revised as of July 1, 2019"

publication_date: "As of July 1, 2019"

contains_description: "Containing a codification of documents of general applicability and future effect"

publication_info: "Published by the Office of the Federal Register National Archives and Records Administration as a Special Edition of the Federal Register"

---

Except as provided in subpart E, each NSO shall require the smelter owner to prevent all violations of the NAAQS in the smelter's designated liability area (DLA) through the operation of an approved supplementary control system (SCS).

§57.401 - General requirements.