40 CFR § 420.87 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional technology (BCT).

---
identifier: "/us/cfr/t40/s420.87"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 420.87 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional technology (BCT)."
title_number: 40
title_name: "Protection of Environment"
section_number: "420.87"
section_name: "Effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional technology (BCT)."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "N"
subchapter_name: "EFFLUENT GUIDELINES AND STANDARDS"
part_number: "420"
part_name: "IRON AND STEEL 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: "33 U.S.C. 1311, 1314, 1316, 1317, 1318, 1342, and 1361."
regulatory_source: "47 FR 23284, May 27, 1982, unless otherwise noted."
cfr_part: "420"
---


# 420.87 Effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional technology (BCT).

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

(a) *Salt bath descaling, oxidizing*—(1) *Batch, sheet and plate.*

Subpart H

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.204 | 0.0876 |
| pH | () | () |
| Within the range of 6.0 to 9.0. |  |  |

(2) *Batch, rod and wire.*

Subpart H

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.123 | 0.0526 |
| pH | () | () |
| Within the range of 6.0 to 9.0. |  |  |

(3) *Batch, pipe and tube.*

Subpart H

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.496 | 0.213 |
| pH | () | () |
| Within the range of 6.0 to 9.0. |  |  |

(4) *Continuous.*

Subpart H

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.0964 | 0.0413 |
| pH | () | () |
| Within the range of 6.0 to 9.0. |  |  |

(b) *Salt bath descaling, reducing*—(1) *Batch.*

Subpart H

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.0949 | 0.0407 |
| pH | () | () |
| Within the range of 6.0 to 9.0. |  |  |

(2) *Continuous.*

Subpart H

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.532 | 0.228 |
| pH | () | () |
| Within the range of 6.0 to 9.0. |  |  |

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