40 CFR § 424.25 - Standards of performance for new sources.

---
identifier: "/us/cfr/t40/s424.25"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 424.25 - Standards of performance for new sources."
title_number: 40
title_name: "Protection of Environment"
section_number: "424.25"
section_name: "Standards of performance for new sources."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "N"
subchapter_name: "EFFLUENT GUIDELINES AND STANDARDS"
part_number: "424"
part_name: "FERROALLOY MANUFACTURING POINT SOURCE CATEGORY"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "Secs. 301, 304(b) and (c), 306(b) and (c), 307(c) of the Federal Water Pollution Control Act, as amended; 33 U.S.C. 1251, 1311, 1314(b) and (c), 1316 (b) and (c), 1317(c); 86 Stat. 816  Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217."
regulatory_source: "39 FR 6809, Feb. 22, 1974, unless otherwise noted."
cfr_part: "424"
---


# 424.25 Standards of performance for new sources.

The following standards of performance establish the quantity or quality of pollutants or pollutant properties, controlled by this section, which may be discharged by a new source subject to the provisions of this subpart:

|  |  |  |
| --- | --- | --- |
|  | Metric units (kg/Mwh) |  |
| TSS | 0.032 | 0.016 |
| Chromium total | .001 | .0005 |
| Chromium VI | .0001 | .00005 |
| Manganese total | .011 | .005 |
| Cyanide total | .0005 | .0003 |
| Phenols | .0004 | .0002 |
| pH | () | () |
|  | English units (lb/Mwh) |  |
| TSS | .071 | .035 |
| Chromium total | .002 | .0012 |
| Chromium VI | .0002 | .0001 |
| Manganese total | .023 | .012 |
| Cyanide total | .001 | .0006 |
| Phenols | .0009 | .0005 |
| pH | () | () |
| Within the range 6.0 to 9.0. |  |  |

*Provided, however,* That for nonelectric furnace smelting processes, the units of effluent limitations set forth in this section shall be read as “kg/kkg of product” rather than “kg/Mwh,” and the limitations (except for pH) shall be 3.3 times those listed in the table in this section (or, for English units, “lb/ton of product” rather than “lb/Mwh,” and the limitations (except for pH) shall be three times those listed in the table).

[39 FR 6809, Feb. 22, 1974, as amended at 39 FR 17841, May 21, 1974]