---
kind: "section"
citation: "40 C.F.R. § 437.15"
title: "40"
number: "437.15"
heading: "Pretreatment standards for existing sources (PSES)."
url: "https://uscodex.org/cfr/40/437.15"
---

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

- (a) Except as provided in 40 CFR [403.7](/cfr/40/403.7.md), [403.13](/cfr/40/403.13.md) or [§ 437.10(b)](/cfr/40/437.10.md?p=b), and no later than December 22, 2003, any existing source subject to this subpart must achieve the following pretreatment standards: Standards for antimony, arsenic, cadmium, chromium, cobalt, copper, lead, mercury, nickel, silver, tin, titanium, vanadium, and zinc are the same as the corresponding limitation specified in [§ 437.11(a)](/cfr/40/437.11.md?p=a).
- (b) In-plant standards for cyanide are the same as the limitations specified in [§ 437.11(b)](/cfr/40/437.11.md?p=b).

## Notes

### Amendments

[65 FR 81300, Dec. 22, 2000, as amended at 68 FR 71023, Dec. 22, 2003]

### Authority

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

### Source

Source: 65 FR 81300, Dec. 22, 2000, unless otherwise noted.

### Amendments

[65 FR 81300, Dec. 22, 2000, as amended at 68 FR 71023, Dec. 22, 2003]