40 CFR § 421.53 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

---
identifier: "/us/cfr/t40/s421.53"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 421.53 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable."
title_number: 40
title_name: "Protection of Environment"
section_number: "421.53"
section_name: "Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "N"
subchapter_name: "EFFLUENT GUIDELINES AND STANDARDS"
part_number: "421"
part_name: "NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
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."
regulatory_source: "49 FR 8790, Mar. 8, 1984, unless otherwise noted."
cfr_part: "421"
---


# 421.53 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable:

(a) Subpart E—Casting Contact Cooling.

BAT Effluent Limitations

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kg (pounds per million pounds) of copper cast |  |
| Arsenic | .692 | .309 |
| Copper | .638 | .304 |
| Nickel | .274 | .184 |

(b) Subpart E—Anode and Cathode Rinse.

BAT Effluent Limitations

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kg (pounds per million pounds) of cathode copper production |  |
| Arsenic | .000 | .000 |
| Copper | .000 | .000 |
| Nickel | .000 | .000 |

(c) Subpart E—Spent Electrolyte.

BAT Effluent Limitations

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kg (pounds per million pounds) of copper cathode production |  |
| Arsenic | .068 | .031 |
| Copper | .063 | .030 |
| Nickel | .027 | .018 |

(d) Subpart E—Casting Wet Air Pollution Control.

BAT Effluent Limitations

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kg (pounds per million pounds) of casting production |  |
| Arsenic | .000 | .000 |
| Copper | .000 | .000 |
| Nickel | .000 | .000 |

(e) Subpart E—By-Product Recovery.

BAT Effluent Limitations

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kg (pounds per million pounds) of product recovered from electrolytic slimes processing |  |
| Arsenic | .000 | .000 |
| Copper | .000 | .000 |
| Nickel | .000 | .000 |

[49 FR 8801, Mar. 8, 1984; 49 FR 26739, June 29, 1984, as amended at 49 FR 29795, July 24, 1984]