---
kind: "section"
citation: "40 C.F.R. § 437.23"
title: "40"
number: "437.23"
heading: "Effluent limitations attainable by the application of the best available technology economically achievable (BAT)."
url: "https://uscodex.org/cfr/40/437.23"
---

# §437.23. Effluent limitations attainable by the application of the best available technology economically achievable (BAT).


Except as provided in [40 CFR 125.30 through 125.32](/cfr/40/125.30..125.32.md) or [§ 437.20(b)](/cfr/40/437.20.md?p=b), any existing point source subject to this subpart must achieve the following effluent limitations by the application of BAT: Limitations for arsenic, cadmium, chromium, cobalt, copper, lead, mercury, tin, zinc, butylbenzyl phthalate, carbazole, n-decane, bis(2-ethylhexyl) phthalate, fluoranthene, and n-octadecane are the same as the corresponding limitation specified in [§ 437.21](/cfr/40/437.21.md).


## 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]