40 CFR § 421.94 - Standards of performance for new sources.
---identifier: "/us/cfr/t40/s421.94"source: "ecfr"legal_status: "authoritative_unofficial"title: "40 CFR § 421.94 - Standards of performance for new sources."title_number: 40title_name: "Protection of Environment"section_number: "421.94"section_name: "Standards of performance 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/s421.94
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.
# 421.94 Standards of performance for new sources.Any new source subject to this subpart shall achieve the following new source performance standards:Subpart I—Metallurgical Acid Plant—NSPS| 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]. || Total suspended solids | 38.310 | 30.650 || pH | () | () || For Molybdenum acid plants only. | | || Within the range of 7.5 to 10.0 at all times. | | |[50 FR 38343, Sept. 20, 1985, as amended at 55 FR 31697, Aug. 3, 1990]