---
kind: "section"
citation: "40 C.F.R. § 421.126"
title: "40"
number: "421.126"
heading: "Pretreatment standards for new sources."
url: "https://uscodex.org/cfr/40/421.126"
---

# §421.126. Pretreatment standards for new sources.


Except as provided in [40 CFR 403.7](/cfr/40/403.7.md), any new source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with [40 CFR part 403](/cfr/40/part403.md) and achieve the following pretreatment standards for new sources. The mass of wastewater pollutants in secondary silver process wastewater introduced into a POTW shall not exceed the following values:

- (a) **Subpart L—** Film Stripping.
- (b) **Subpart L—** Film Stripping Wet Air Pollution Control and Precipitation and Filtration of Film Stripping Solutions Wet Air Pollution Control.
- (c) **Subpart L—** Precipitation and Filtration of Film Stripping Solutions.
- (d) **Subpart L—** Precipitation and Filtration of Photographic Solutions.
- (e) **Subpart L—** Precipitation and Filtration of Photographic Solutions Wet Air Pollution Control.
- (f) **Subpart L—** Electrolytic Refining.
- (g) **Subpart L—** Furnace Wet Air Pollution Control.
- (h) **Subpart L—** Leaching.
- (i) **Subpart L—** Leaching Wet Air Pollution Control and Precipitation of Nonphotographic Solutions Wet Air Pollution Control.
- (j) **Subpart L—** Precipitation and Filtration of Nonphotographic Solutions.
- (k) **Subpart L—** Floor and Equipment Washdown.

## Notes

### Amendments

[49 FR 8821, Mar. 8, 1984; 49 FR 26739, June 29, 1984]

### Source

Source: 49 FR 8821, Mar. 8, 1984, unless otherwise noted.

### Authority

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.

### Source

Source: 49 FR 8790, Mar. 8, 1984, unless otherwise noted.

### Amendments

[49 FR 8821, Mar. 8, 1984; 49 FR 26739, June 29, 1984]