40 CFR § 445.21 - Effluent limitations attainable by the application of the best practicable control technology currently available (BPT).

---
identifier: "/us/cfr/t40/s445.21"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 445.21 - Effluent limitations attainable by the application of the best practicable control technology currently available (BPT)."
title_number: 40
title_name: "Protection of Environment"
section_number: "445.21"
section_name: "Effluent limitations attainable by the application of the best practicable control technology currently available (BPT)."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "N"
subchapter_name: "EFFLUENT GUIDELINES AND STANDARDS"
part_number: "445"
part_name: "LANDFILLS 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, 306, 307, 308, 402 and 501 of the Clean Water Act, as amended (33 U.S.C. 1311, 1314, 1316, 1317, 1318, 1342 and 1361)"
regulatory_source: "65 FR 3048, Jan. 19, 2000, unless otherwise noted."
cfr_part: "445"
---


# 445.21 Effluent limitations attainable by the application of the best practicable control technology currently available (BPT).

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 which represent the application of BPT:

Effluent Limitations

| Regulated parameter | Maximum daily | Maximum monthly avg. |
| --- | --- | --- |
| BOD | 140 | 37 |
| TSS | 88 | 27 |
| Ammonia (as N) | 10 | 4.9 |
| α-Terpineol | 0.033 | 0.016 |
| Benzoic acid | 0.12 | 0.071 |
| -Cresol | 0.025 | 0.014 |
| Phenol | 0.026 | 0.015 |
| Zinc | 0.20 | 0.11 |
| pH | () | () |
| Milligrams per liter (mg/L, ppm) |  |  |
| Within the range 6 to 9. |  |  |

[65 FR 3048, Jan. 19, 2000; 65 FR 14344, Mar. 16, 2000]