40 CFR § 405.122 - 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/s405.122"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 405.122 - 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: "405.122"
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: "405"
part_name: "DAIRY PRODUCTS PROCESSING POINT SOURCE CATEGORY"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "Secs. 301, 304 (b) and (c), 306 (b) and (c) and 307(c) of the Federal Water Pollution Control Act, as amended (the Act); 33 U.S.C. 1251, 1311, 1314 (b) and (c), 1316 (b) and (c), and 1317(c); 86 Stat. 816,  Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217."
regulatory_source: "39 FR 18597, May 28, 1974, unless otherwise noted."
cfr_part: "405"
---


# 405.122 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 §§ 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 (BPT):

(a) For whey drying plants with an input equivalent to more than 57,000 lb/day of 40 percent solids whey (22,800 lb/day of solids or 15,620 lb/day of BOD*5* input).

|  |  |  |
| --- | --- | --- |
|  | Metric units (kilograms per 1,000 kg of BOD input) |  |
| BOD | 1.00 | 0.400 |
| TSS | 1.50 | .600 |
| pH | () | () |
|  | English units (pounds per 100 lb of BOD input) |  |
| BOD | 0.100 | 0.040 |
| TSS | 0.150 | .060 |
| pH | () | () |
| Within the range 6.0 to 9.0. |  |  |

(b) For whey drying plants with an input equivalent to 57,000 lb/day or less of 40 percent solids whey (under 22,800 lb/day solids or 15,620 lb/day of BOD*5* input).

|  |  |  |
| --- | --- | --- |
|  | Metric units (kilograms per 1,000 kg of BOD input) |  |
| BOD | 1.30 | 0.650 |
| TSS | 1.95 | .975 |
| pH | () | () |
|  | English units (pounds per 100 lb of BOD input) |  |
| BOD | 0.130 | 0.065 |
| TSS | 0.195 | .098 |
| pH | () | () |
| Within the range 6.0 to 9.0. |  |  |

[39 FR 18597, May 28, 1974, as amended at 60 FR 33935, June 29, 1995]