{"data":{"id":"us/40-cfr-419.55","jurisdiction":"us","citation":"40 CFR 419.55","heading":"Pretreatment standards for existing sources (PSES).","body":"Except as provided in 40 CFR 403.7 and 403.13 any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR 403 and achieve the following pretreatment standards for existing sources (PSES). The following standards apply to the total refinery flow contribution to the POTW:\nPollutant or pollutant property Pretreatment standards for existing sources—maximum for any 1 day\nMilligrams per liter (mg/l)\nOil and grease 100\nAmmonia (as N) 1 100\n1 Where the discharge to the POTW consists solely of sour waters, the owner or operator has the option of complying with this limit or the daily maximum mass limitation for ammonia set forth in § 419.53 (a) and (b).","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS","PART 419—PETROLEUM REFINING POINT SOURCE CATEGORY","Subpart E—Integrated Subcategory"],"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":"c8941801bce97d5c22e385c6ec24db7f1cf827d9938fa4ae4b1728e475eb30ff","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-419.54","next":"us/40-cfr-419.56"},"notice":"GroundRules: Original legal text. Not legal advice."}