---
kind: "section"
citation: "40 C.F.R. § 420.85"
title: "40"
number: "420.85"
heading: "Pretreatment standards for existing sources (PSES)."
url: "https://uscodex.org/cfr/40/420.85"
---

# §420.85. Pretreatment standards for existing sources (PSES).


Except as provided in 40 CFR [403.7](/cfr/40/403.7.md) and [403.13](/cfr/40/403.13.md), any existing 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 existing sources.

- (a) **Salt bath descaling, oxidizing—**
  - (1) **Batch, sheet and plate.**
  - (2) **Batch, rod and wire.**
  - (3) **Batch, pipe and tube.**
  - (4) **Continuous.**
- (b) **Salt bath descaling, reducing—**
  - (1) **Batch.**
  - (2) **Continuous.**

## Notes

### Amendments

[47 FR 23284, May 27, 1982; 47 FR 41739, Sept. 22, 1982]

### Authority

Authority: 33 U.S.C. 1311, 1314, 1316, 1317, 1318, 1342, and 1361.

### Source

Source: 47 FR 23284, May 27, 1982, unless otherwise noted.

### Amendments

[47 FR 23284, May 27, 1982; 47 FR 41739, Sept. 22, 1982]