40 CFR § 405.112 - 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/s405.112"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 405.112 - 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: "405.112"
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"
---


# 405.112 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 condensing plants with over 300,000 lb/day of fluid raw whey input (over 20,700 lb/day of solids or 14,160 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 condensing plants with 300,000 lb/day or less of raw fluid whey input (less than 20,700 lb/day of solids or 14,160 lb/day of BOD*5* input).

|  |  |  |
| --- | --- | --- |
|  | Metric units (kilograms per 1,000 kg of BOD input) |  |
| BOD | 1.30 | 0.650 |
| TSS | 1.950 | .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. |  |  |

(c) For plants in the size range covered in paragraph (b) once-through barometric condenser water may be discharged untreated if the composite net entrainment is below 15 mg/1 of BOD*5* for any one day and below 10 mg/1 of BOD*5* as the average for thirty consecutive days.

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