40 CFR § 421.284 - Standards of performance for new sources.
---
identifier: "/us/cfr/t40/s421.284"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 421.284 - Standards of performance for new sources."
title_number: 40
title_name: "Protection of Environment"
section_number: "421.284"
section_name: "Standards of performance for new sources."
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"
---
# 421.284 Standards of performance for new sources.
Any new source subject to this subpart shall achieve the following new source performance standards:
(a) Tantalum alloy leach and rinse.
NSPS for the Secondary Tantalum Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of tantalum powder produced | |
| Copper | 295.200 | 140.700 |
| Lead | 64.570 | 29.980 |
| Nickel | 126.800 | 85.320 |
| Zinc | 235.200 | 96.850 |
| Tantalum | 103.800 | |
| Total suspended solids | 3,459.000 | 2,767.000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(b) Capacitor leach and rinse.
NSPS for the Secondary Tantalum Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of tantalum powder produced from leaching | |
| Copper | 25.860 | 12.320 |
| Lead | 5.656 | 2.626 |
| Nickel | 11.110 | 7.474 |
| Zinc | 20.600 | 8.484 |
| Tantalum | 9.090 | |
| Total suspended solids | 303.000 | 242.400 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(c) Tantalum sludge leach and rinse.
NSPS for the Secondary Tantalum Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of equivalent pure tantalum powder produced | |
| Copper | 262.800 | 125.200 |
| Lead | 57.480 | 26.690 |
| Nickel | 112.900 | 75.960 |
| Zinc | 209.400 | 86.230 |
| Tantalum | 92.390 | |
| Total suspended solids | 3,080.000 | 2,464.000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(d) Tantalum powder acid wash and rinse.
NSPS for the Secondary Tantalum Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of tantalum powder produced | |
| Copper | 0.448 | 0.214 |
| Lead | 0.098 | 0.046 |
| Nickel | 0.193 | 0.130 |
| Zinc | 0.357 | 0.147 |
| Tantalum | 0.158 | |
| Total suspended solids | 5.250 | 4.200 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(e) Leaching wet air pollution control.
NSPS for the Secondary Tantalum Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of equivalent pure tantalum powder produced | |
| Copper | 6.246 | 2.977 |
| Lead | 1.366 | 0.634 |
| Nickel | 2.684 | 1.806 |
| Zinc | 4.978 | 2.050 |
| Tantalum | 2.196 | |
| Total suspended solids | 73.200 | 58.560 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |