40 CFR § 471.101 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).
---
identifier: "/us/cfr/t40/s471.101"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 471.101 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT)."
title_number: 40
title_name: "Protection of Environment"
section_number: "471.101"
section_name: "Effluent limitations representing the degree of effluent reduction 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: "471"
part_name: "NONFERROUS METALS FORMING AND METAL POWDERS 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(b), (c), (e), and (g), 306(b) and (c), 307, 308, and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972 as amended by the Clean Water Act of 1977) (the “Act”); 33 U.S.C. 1311, 1314(b), (c), (e), and (g), 1316(b) and (c), and 1361; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217."
regulatory_source: "50 FR 34270, Aug. 23, 1985, unless otherwise noted."
cfr_part: "471"
---
# 471.101 Effluent limitations representing the degree of effluent reduction 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 for the process operations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT):
(a) *Metal powder production atomization wastewater.*
Subpart J—BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/off-kg (pounds per million off-pounds) of powder wet atomized | |
| Copper | 9.58 | 5.04 |
| Cyanide | 1.46 | 0.605 |
| Lead | 2.12 | 1.01 |
| Oil and grease | 101 | 60.5 |
| TSS | 207 | 98.3 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(b) *Sizing spent emulsion.*
Subpart J—BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/off-kg (pounds per million off-pounds) of powder sized | |
| Copper | 0.028 | 0.015 |
| Cyanide | 0.004 | 0.002 |
| Lead | 0.006 | 0.003 |
| Oil and grease | 0.292 | 0.175 |
| TSS | 0.599 | 0.285 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(c) *Oil-resin impregnation wastewater—subpart J—BPT.* There shall be no discharge of process wastewater pollutants.
(d) *Steam treatment wet air pollution control scrubber blowdown.*
Subpart J—BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/off-kg (pounds per million off-pounds) of power metallurgy parts steam treated | |
| Copper | 1.51 | 0.792 |
| Cyanide | 0.230 | 0.095 |
| Lead | 0.333 | 0.159 |
| Oil and grease | 15.9 | 9.51 |
| TSS | 32.5 | 15.5 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(e) *Tumbling, burnishing and cleaning wastewater.*
Subpart J—BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/off-kg (pounds per million off-pounds) of powder metallurgy parts tumbled, burnished, or cleaned | |
| Copper | 8.36 | 4.40 |
| Cyanide | 1.28 | 0.528 |
| Lead | 1.85 | 0.880 |
| Oil and grease | 88.0 | 52.800 |
| TSS | 181 | 85.8 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(f) *Sawing or grinding spent neat oils—subpart J—BPT.* There shall be no discharge of process wastewater pollutants.
(g) *Sawing or grinding spent emulsion.*
Subpart J—BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/off-kg (pounds per million off-pounds) of powder metallurgy parts sawed or ground with emulsion | |
| Copper | 0.035 | 0.018 |
| Cyanide | 0.005 | 0.002 |
| Lead | 0.008 | 0.004 |
| Oil and grease | 0.362 | 0.217 |
| TSS | 0.742 | 0.353 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(h) *Sawing or grinding contact cooling water.*
Subpart J—BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/off-kg (pounds per million off-pounds) of powder metallurgy parts sawed or ground with contact cooling | |
| Copper | 3.08 | 1.62 |
| Cyanide | 0.470 | 0.195 |
| Lead | 0.681 | 0.324 |
| Oil and grease | 32.4 | 19.5 |
| TSS | 66.4 | 31.6 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(i) *Hot pressing contact cooling water.*
Subpart J—BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/off-kg (pounds per million off-pounds) of powder cooled after pressing | |
| Copper | 16.7 | 8.80 |
| Cyanide | 2.55 | 1.06 |
| Lead | 3.70 | 1.76 |
| Oil and grease | 176 | 106 |
| TSS | 361 | 172 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(j) *Mixing wet air pollution control scrubber blowdown.*
Subpart J—BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/off-kg (pounds per million off-pounds) of powder mixed | |
| Copper | 15.0 | 7.90 |
| Cyanide | 2.29 | 0.948 |
| Lead | 3.32 | 1.58 |
| Oil and grease | 158 | 94.8 |
| TSS | 324 | 154 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(k) *Degreasing spent solvents—subpart J—BPT.* There shall be no discharge of process wastewater pollutants.
[50 FR 34270, Aug. 23, 1985; 51 FR 2889, Jan. 22, 1986]