40 CFR § 437.11 - Effluent limitations attainable by the application of the best practicable control technology currently available (BPT).
---
identifier: "/us/cfr/t40/s437.11"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 437.11 - 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: "437.11"
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: "437"
part_name: "THE CENTRALIZED WASTE TREATMENT POINT SOURCE CATEGORY"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "33 U.S.C. 1311, 1314, 1316, 1317, 1318, 1342, and 1361."
regulatory_source: "65 FR 81300, Dec. 22, 2000, unless otherwise noted."
cfr_part: "437"
---
# 437.11 Effluent limitations attainable by the application of the best practicable control technology currently available (BPT).
(a) Except as provided in 40 CFR 125.30 through 125.32 or § 437.10(b), any existing point source subject to this subpart must achieve the following effluent limitations representing the application of BPT:
BPT Limitations
| Regulatedparameter | Maximum daily | Maximum monthly avg. |
| --- | --- | --- |
| | | |
| O&G | 205 | 50.2 |
| pH | () | () |
| TSS | 60.0 | 31.0 |
| | | |
| Antimony | 0.249 | 0.206 |
| Arsenic | 0.162 | 0.104 |
| Cadmium | 0.474 | 0.0962 |
| Chromium | 15.5 | 3.07 |
| Cobalt | 0.192 | 0.124 |
| Copper | 4.14 | 1.06 |
| Lead | 1.32 | 0.283 |
| Mercury | 0.00234 | 0.000739 |
| Nickel | 3.95 | 1.45 |
| Silver | 0.120 | 0.0351 |
| Tin | 0.409 | 0.120 |
| Titanium | 0.0947 | 0.0618 |
| Vanadium | 0.218 | 0.0662 |
| Zinc | 2.87 | 0.641 |
| mg/L (ppm). | | |
| Within the range 6 to 9. | | |
(b) The following in-plant limitations apply to metal-bearing wastewater containing cyanide:
In-Plant Limitations
| Regulatedparameter | Maximum daily | Maximum monthly avg. |
| --- | --- | --- |
| Cyanide | 500 | 178 |
| mg/L (ppm). | | |
[65 FR 81300, Dec. 22, 2000, as amended at 68 FR 71023, Dec. 22, 2003]