40 CFR § 421.96 - Pretreatment standards for new sources.
---identifier: "/us/cfr/t40/s421.96"source: "ecfr"legal_status: "authoritative_unofficial"title: "40 CFR § 421.96 - Pretreatment standards for new sources."title_number: 40title_name: "Protection of Environment"section_number: "421.96"section_name: "Pretreatment standards for new sources."chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"subchapter_number: "N"subchapter_name: "EFFLUENT GUIDELINES AND STANDARDS"part_number: "421"part_name: "NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY"positive_law: falsecurrency: "2026-03-24"last_updated: "2026-03-24"format_version: "1.1.0"generator: "[email protected]"authority: "Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307 (b) and (c), 308 and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) and the Water Quality Act of 1987 (the “Act”); 33 U.S.C. 1311, 1314 (b), (c), (e), and (g), 1316 (b) and (c), 1317 (b) and (c), 1318 and 1361; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217; 101 Stat. 7, Pub. L. 100-4."regulatory_source: "49 FR 8790, Mar. 8, 1984, unless otherwise noted."cfr_part: "421"---
Identifier
/us/cfr/t40/s421.96
Currency
2026-03-24
Positive Law
No
Updated
2026-03-24
Chapter
Environmental Protection Agency
Authority
Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307 (b) and (c), 308 and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water A... Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307 (b) and (c), 308 and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) and the Water Quality Act of 1987 (the “Act”); 33 U.S.C. 1311, 1314 (b), (c), (e), and (g), 1316 (b) and (c), 1317 (b) and (c), 1318 and 1361; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217; 101 Stat. 7, Pub. L. 100-4.
# 421.96 Pretreatment standards for new sources.Except as provided in 40 CFR 403.7, any new source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for new sources. The mass of wastewater pollutants in metallurgical acid plant blowdown introduced into a POTW shall not exceed the following values:Subpart I—Metallurgical Acid Plant—PSNS| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average || --- | --- | --- || | mg/kg (pounds per million pounds) of 100 pct sulfuric acid capacity | || Arsenic | 3.550 | 1.584 || Cadmium | 0.511 | 0.204 || Copper | 3.269 | 1.558 || Lead | 0.715 | 0.332 || Zinc | 2.605 | 1.073 || Fluoride | 89.390 | 50.820 || Molybdenum | [Reserved] | [Reserved]. || For Molybdenum acid plants only. | | |[50 FR 38343, Sept. 20, 1985, as amended at 55 FR 31697, Aug. 3, 1990]