40 CFR § 421.72 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

---
identifier: "/us/cfr/t40/s421.72"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 421.72 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available."
title_number: 40
title_name: "Protection of Environment"
section_number: "421.72"
section_name: "Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available."
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"
---


# 421.72 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

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 practicable control technology currently available:

(a) Subpart G—Sinter Plant Materials Handling Wet Air Pollution Control.

BPT Effluent Limitations

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kkg (pounds per billion pounds) of sinter production |  |
| Lead | 594.000 | 270.000 |
| Zinc | 525.000 | 219.600 |
| Total suspended solids | 14,760.000 | 7,020.000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. |  |  |

(b) Subpart G—Blast Furnace Wet Air Pollution Control.

BPT Effluent Limitations

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kkg (pounds per billion pounds) of blast furance lead bullion produced |  |
| Lead | .000 | .000 |
| Zinc | .000 | .000 |
| Total suspended solids | .000 | .000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. |  |  |

(c) Subpart G—Blast Furnace Slag Granulation.

BPT Effluent Limitations

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kkg (pounds per billion pounds) of blast furance lead bullion produced |  |
| Lead | 6,155.000 | 2,798.000 |
| Zinc | 5,446.000 | 2,276.000 |
| Total suspended solids | 153,000.000 | 72,740.000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. |  |  |

(d) Subpart G—Dross Reverberatory Slag Granulation.

BPT Effluent Limitations

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kkg (pounds per billion pounds) of slag, speiss, or matte granulated |  |
| Lead | 9,499.000 | 4,318.000 |
| Zinc | 8,405.000 | 3,512.000 |
| Total suspended solids | 236,000.000 | 112,300.000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. |  |  |

(e) Subpart G—Dross Reverberatory Furnace Wet Air Pollution Control.

BPT Effluent Limitations

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kkg (pounds per billion pounds) of dross reverberatory furnace production |  |
| Lead | 15,920.000 | 7,235.000 |
| Zinc | 14,080.000 | 5,884.000 |
| Total suspended solids | 395,500.000 | 188,100.000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. |  |  |

(f) Subpart G—Zinc Fuming Wet Air Pollution Control.

BPT Effluent Limitations

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kkg (pounds per billion pounds) of blast furance lead bullion produced |  |
| Lead | 702.900 | 319.500 |
| Zinc | 622.000 | 259.900 |
| Total suspended solids | 17,470.000 | 8,307.000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. |  |  |

(g) Subpart G—Hard Lead Refining Slag Granulation.

BPT Effluent Limitations

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kkg (pounds per billion pounds) of hard lead produced |  |
| Lead | .000 | .000 |
| Zinc | .000 | .000 |
| Total suspended solids | .000 | .000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. |  |  |

(h) Subpart G—Hard Lead Refining Air Pollution Control.

BPT Effluent Limitations

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kkg (pounds per billion pounds) of hard lead produced |  |
| Lead | 32,730.000 | 14,880.000 |
| Zinc | 28,960.000 | 12,100.000 |
| Total suspended solids | 813,300.000 | 386,800.000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. |  |  |

(i) Subpart G—Facility Washdown.

BPT Effluent Limitations

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kkg (pounds per billion pounds) of lead bullion produced |  |
| Lead | .000 | .000 |
| Zinc | .000 | .000 |
| Total suspended solids | .000 | .000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. |  |  |

(j) Subpart G—Employee Handwash.

BPT Effluent Limitations

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kkg (pounds per billion pounds) of lead bullion produced |  |
| Lead | 5.445 | 2.475 |
| Zinc | 4.818 | 2.013 |
| Total suspended solids | 135.300 | 64.350 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. |  |  |

(k) Subpart G—Respirator Wash.

BPT Effluent Limitations

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kkg (pounds per billion pounds) of lead bullion produced |  |
| Lead | 8.745 | 3.975 |
| Zinc | 7.738 | 3.233 |
| Total suspended solids | 217.300 | 103.400 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. |  |  |

(l) Subpart G—Laundering of Uniforms.

BPT Effluent Limitations

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kkg (pounds per billion pounds) of lead bullion produced |  |
| Lead | 25.580 | 11.630 |
| Zinc | 22.630 | 9.455 |
| Total suspended solids | 635.500 | 302.300 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. |  |  |

[49 FR 8803, Mar. 8, 1984; 49 FR 26739, June 29, 1984, as amended at 49 FR 29795, July 24, 1984]