40 CFR § 421.302 - 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/s421.302"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 421.302 - 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: "421.302"
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: "421"
part_name: "NONFERROUS METALS MANUFACTURING 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 (b) and (c), 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) and the Water Quality Act of 1987 (the “Act”); 33 U.S.C. 1311, 1314 (b), (c), (e), and (g), 1316 (b) and (c), 1317 (b) and (c), 1318 and 1361; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217; 101 Stat. 7, Pub. L. 100-4."
regulatory_source: "49 FR 8790, Mar. 8, 1984, unless otherwise noted."
cfr_part: "421"
---
# 421.302 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 40 CFR 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 technology currently available:
(a) Chlorination off-gas wet air pollution control.
BPT Limitations for the Primary and Secondary Titanium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of TiCl produced | |
| Chromium (total) | 0.412 | 0.168 |
| Lead | 0.393 | 0.187 |
| Nickel | 1.797 | 1.189 |
| Titanium | 0.880 | 0.384 |
| Oil and grease | 18.720 | 11.230 |
| Total suspended solids | 38.380 | 18.250 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(b) Chlorination area-vent wet air pollution control.
BPT Limitations for the Primary and Secondary Titanium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of TiCl produced | |
| Chromium (total) | 0.412 | 0.168 |
| Chromium (total) | 0.458 | 0.187 |
| Lead | 0.437 | 0.208 |
| Nickel | 1.997 | 1.321 |
| Titanium | 0.978 | 0.426 |
| Oil and grease | 20.800 | 12.480 |
| Total suspended solids | 42.640 | 20.280 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(c) TiCl<sub>4</sub> handling wet air pollution control.
BPT Limitations for the Primary and Secondary Titanium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of TiCl handled | |
| Chromium (total) | 0.082 | 0.034 |
| Lead | 0.079 | 0.037 |
| Nickel | 0.359 | 0.237 |
| Titanium | 0.176 | 0.077 |
| Oil and grease | 3.740 | 2.244 |
| Total suspended solids | 7.667 | 3.647 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(d) Reduction area wet air pollution control.
BPT Limitations for the Primary and Secondary Titanium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of titanium produced | |
| Chromium (total) | 18.170 | 7.435 |
| Lead | 17.350 | 8.261 |
| Nickel | 79.300 | 52.450 |
| Titanium | 38.820 | 16.930 |
| Oil and grease | 826.100 | 495.600 |
| Total suspended solids | 1,693.000 | 805.400 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(e) Melt cell wet air pollution control.
BPT Limitations for the Primary and Secondary Titanium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of titanium produced | |
| Chromium (total) | 9.352 | 3.826 |
| Lead | 8.927 | 4.251 |
| Nickel | 40.810 | 26.990 |
| Titanium | 19.980 | 8.714 |
| Oil and grease | 425.100 | 255.000 |
| Total suspended solids | 871.400 | 414.500 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(f) Chlorine liquefaction wet air pollution control.
BPT Limitations for the Primary and Secondary Titanium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of titanium produced | |
| Chromium (total) | 130.900 | 53.560 |
| Lead | 125.000 | 59.510 |
| Nickel | 571.300 | 377.900 |
| Titanium | 279.700 | 122.000 |
| Oil and grease | 5,951.000 | 3,571.000 |
| Total suspended solids | 12,200.000 | 5,702.000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(g) Sodium reduction container reconditioning wash water.
BPT Limitations for the Primary and Secondary Titanium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of titanium produced | |
| Chromium (total) | 0.564 | 0.231 |
| Lead | 0.538 | 0.256 |
| Nickel | 2.461 | 1.628 |
| Titanium | 1.205 | 0.526 |
| Oil and grease | 25.640 | 15.380 |
| Total suspended solids | 52.560 | 25.000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(h) Chip crushing wet air pollution control.
BPT Limitations for the Primary and Secondary Titanium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of titanium produced | |
| Chromium (total) | 10.090 | 4.126 |
| Lead | 9.627 | 4.584 |
| Nickel | 44.010 | 29.110 |
| Titanium | 21.550 | 9.398 |
| Oil and grease | 458.400 | 275.100 |
| Total suspended solids | 939.800 | 447.000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(i) Acid leachate and rinse water.
BPT Limitations for the Primary and Secondary Titanium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of titanium produced | |
| Chromium (total) | 5.210 | 2.131 |
| Lead | 4.973 | 2.368 |
| Nickel | 22.730 | 15.040 |
| Titanium | 11.130 | 4.854 |
| Oil and grease | 236.800 | 142.100 |
| Total suspended solids | 485.400 | 230.900 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(j) Sponge crushing and screening wet air pollution control.
BPT Limitations for the Primary and Secondary Titanium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of titanium produced | |
| Chromium (total) | 2.847 | 1.165 |
| Lead | 2.717 | 1.294 |
| Nickel | 12.420 | 8.217 |
| Titanium | 6.082 | 2.653 |
| Oil and grease | 129.400 | 77.640 |
| Total suspended solids | 265.300 | 126.200 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(k) Acid pickle and wash water.
BPT Limitations for the Primary and Secondary Titanium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of titanium pickled | |
| Chromium (total) | 0.027 | 0.011 |
| Lead | 0.026 | 0.012 |
| Nickel | 0.117 | 0.077 |
| Titanium | 0.057 | 0.025 |
| Oil and grease | 1.220 | 0.732 |
| Total suspended solids | 2.501 | 1.190 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(l) Scrap milling wet air pollution control.
BPT Limitations for the Primary and Secondary Titanium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of scrap milled | |
| Chromium (total) | 0.995 | 0.407 |
| Lead | 0.950 | 0.452 |
| Nickel | 4.341 | 2.871 |
| Titanium | 2.125 | 0.927 |
| Oil and grease | 45.220 | 27.130 |
| Total suspended solids | 92.700 | 44.090 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(m) Scrap detergent wash water.
BPT Limitations for the Primary and Secondary Titanium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of scrap washed | |
| Chromium (total) | 7.948 | 3.252 |
| Lead | 7.587 | 3.613 |
| Nickel | 34.680 | 22.940 |
| Titanium | 16.980 | 7.406 |
| Oil and grease | 361.300 | 216.800 |
| Total suspended solids | 740.600 | 352.300 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(n) Casting crucible wash water.
BPT Limitations for the Primary and Secondary Titanium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of titanium cast | |
| Chromium (total) | 0.210 | 0.086 |
| Lead | 0.200 | 0.095 |
| Nickel | 0.916 | 0.606 |
| Titanium | 0.448 | 0.196 |
| Oil and grease | 9.540 | 5.724 |
| Total suspended solids | 19.560 | 9.302 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(o) Casting contact cooling water.
BPT Limitations for the Primary and Secondary Titanium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of titanium cast | |
| Chromium (total) | 321.100 | 131.400 |
| Lead | 306.500 | 145.900 |
| Nickel | 1,401.000 | 926.800 |
| Titanium | 685.900 | 299.200 |
| Oil and grease | 14,590.000 | 8,757.000 |
| Total suspended solids | 29,920.000 | 14,230.000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |