{"data":{"id":"us/40-cfr-421.4","jurisdiction":"us","citation":"40 CFR 421.4","heading":"Compliance date for pretreatment standards for existing sources (PSES).","body":"The PSES compliance deadline in subparts A through M is March 8, 1987. The PSES compliance deadline for plants in subparts N through AE is September 20, 1988.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS","PART 421—NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"a87ae709c4b086dbeee6816b80d9512c7d9ba1ab34317c50d6888a9d3f03a467","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.3","next":"us/40-cfr-421.5"},"notice":"GroundRules: Original legal text. Not legal advice."}