40 CFR § 421.324 - Standards of performance for new sources.
---
identifier: "/us/cfr/t40/s421.324"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 421.324 - Standards of performance for new sources."
title_number: 40
title_name: "Protection of Environment"
section_number: "421.324"
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"
---
# 421.324 Standards of performance for new sources.
Any new source subject to this subpart shall achieve the following new source performance standards:
(a) Refinery sump filtrate.
NSPS for the Secondary Uranium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of uranium processed in the refinery | |
| Chromium (total) | 27.14 | 11.00 |
| Copper | 93.88 | 44.74 |
| Nickel | 40.34 | 27.14 |
| Fluoride | 2,567.00 | 1,459.00 |
| Total suspended solids | 1,100.00 | 880.10 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(b) Slag leach reslurry.
NSPS for the Secondary Uranium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of uranium processed in the refinery | |
| Chromium (total) | 1.689 | 0.685 |
| Copper | 5.844 | 2.785 |
| Nickel | 2.511 | 1.689 |
| Fluoride | 159.800 | 90.860 |
| Total suspended solids | 68.490 | 54.790 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(c) Solvent extraction raffinate filtrate.
NSPS for the Secondary Uranium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of uranium processed in the refinery | |
| Chromium (total) | 2.357 | 0.955 |
| Copper | 8.152 | 3.885 |
| Nickel | 3.503 | 2.357 |
| Fluoride | 222.900 | 126.700 |
| Total suspended solids | 95.540 | 76.430 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(d) Digestion wet air pollution control.
NSPS for the Secondary Uranium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of uranium processed in the refinery | |
| Chromium (total) | 0.000 | 0.000 |
| Copper | 0.000 | 0.000 |
| Nickel | 0.000 | 0.000 |
| Fluoride | 0.000 | 0.000 |
| Total suspended solids | 0.000 | 0.000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(e) Evaporation and denitration wet air pollution control
NSPS for the Secondary Uranium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of uranium trioxide produced | |
| Chromium (total) | 0.000 | 0.000 |
| Copper | 0.000 | 0.000 |
| Nickel | 0.000 | 0.000 |
| Fluoride | 0.000 | 0.000 |
| Total suspended solids | 0.000 | 0.000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(f) Hydrofluorination alkaline scrubber.
NSPS for the Secondary Uranium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of uranium tetrafluoride produced | |
| Chromium (total) | 0.007 | 0.003 |
| Copper | 0.026 | 0.012 |
| Nickel | 0.011 | 0.007 |
| Fluoride | 0.700 | 0.398 |
| Total suspended solids | 0.300 | 0.240 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(g) Hydrofluorination water scrubber.
NSPS for the Secondary Uranium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of uranium tetrafluoride produced | |
| Chromium (total) | 0.000 | 0.000 |
| Copper | 0.000 | 0.000 |
| Nickel | 0.000 | 0.000 |
| Fluoride | 0.000 | 0.000 |
| Total suspended solids | 0.000 | 0.000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(h) Magnesium reduction and casting floor wash.
NSPS for the Secondary Uranium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of uranium produced by magnesium reduction | |
| Chromium (total) | 0.011 | 0.005 |
| Copper | 0.039 | 0.018 |
| Nickel | 0.017 | 0.011 |
| Fluoride | 1.054 | 0.599 |
| Total suspended solids | 0.452 | 0.361 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(i) Laundry wastewater.
NSPS for the Secondary Uranium Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of uranium produced by magnesium reduction | |
| Chromium (total) | 0.036 | 0.014 |
| Copper | 0.123 | 0.059 |
| Nickel | 0.053 | 0.036 |
| Fluoride | 3.360 | 1.910 |
| Total suspended solids | 1.440 | 1.152 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |