40 CFR § 420.117 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional technology (BCT).

---
identifier: "/us/cfr/t40/s420.117"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 420.117 - 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: "420.117"
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"
---


# 420.117 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) *Batch.*

Subpart K

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.0730 | 0.0313 |
| O&G | 0.0313 | 0.0104 |
| pH | () | () |
| Within the range of 6.0 to 9.0. |  |  |

(b) *Continuous.*

Subpart K

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.102 | 0.0438 |
| O&G | 0.0438 | 0.0146 |
| pH | () | () |
| Within the range of 6.0 to 9.0. |  |  |