Regulations last checked for updates: May 01, 2025
Title 40 - Protection of Environment last revised: Nov 01, 2025
§ 421.120 - Applicability: Description of the secondary silver subcategory.
The provisions of this subpart are applicable to discharges resulting from the production of silver from secondary silver facilities processing photographic and nonphotographic raw materials.
[49 FR 8821, Mar. 8, 1984; 49 FR 26739, June 29, 1984]
§ 421.121 - Specialized definitions.
For the purpose of this subpart the general definitions, abbreviations, and methods of analysis set forth in 40 CFR part 401 shall apply to this subpart.
§ 421.122 - 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) Subpart L—Film Stripping.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from film stripping
|
| Copper | 95.670 | 50.350
|
| Zinc | 73.510 | 30.720
|
| Ammonia (as N) | 6,712.000 | 2,951.000
|
| Total suspended solids | 2,065.000 | 981.800
|
| pH | (
1) | (
1)
|
(b) Subpart L—Film Stripping Wet Air Pollution Control and Precipitation and Filtration of Film Stripping Solutions Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from precipitation and filtration of film stripping solutions
|
| Copper | 1.843 | .970
|
| Zinc | 1.416 | .592
|
| Ammonia (as N) | 129.300 | 56.840
|
| Total suspended solids | 39.770 | 18.920
|
| pH | (
1) | (
1)
|
(c) Subpart L—Precipitation and Filtration of Film Stripping Solutions.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver precipitated
|
| Copper | 109.400 | 57.570
|
| Zinc | 84.050 | 35.120
|
| Ammonia (as N) | 7,674.000 | 3,374.000
|
| Total suspended solids | 2,361.000 | 1,123.000
|
| pH | (
1) | (
1)
|
(d) Subpart L—Precipitation and Filtration of Photographic Solutions.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver precipitated
|
| Copper | 50.540 | 26.600
|
| Zinc | 38.836 | 16.226
|
| Ammonia (as N) | 3,545.000 | 1,559.000
|
| Total suspended solids | 1,090.600 | 518.700
|
| pH | (
1) | (
1)
|
(e) Subpart L—Precipitation and Filtration of Photographic Solutions Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from precipitation and filtration of photographic solutions
|
| Copper | 23.070 | 12.140
|
| Zinc | 17.730 | 7.406
|
| Ammonia (as N) | 1,618.000 | 711.400
|
| Total suspended solids | 497.800 | 236.800
|
| pH | (
1) | (
1)
|
(f) Subpart L—Electrolytic Refining.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from electrolytic refining
|
| Copper | 1.444 | .760
|
| Zinc | 1.110 | .464
|
| Ammonia (as N) | 101.300 | 44.540
|
| Total suspended solids | 31.160 | 14.820
|
| pH | (
1) | (
1)
|
(g) Subpart L—Furnace Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver roasted, smelted, or dried
|
| Copper | 1.273 | .670
|
| Zinc | .978 | .409
|
| Ammonia (as N) | 89.310 | 39.260
|
| Total suspended solids | 27.470 | 13.070
|
| pH | (
1) | (
1)
|
(h) Subpart L—Leaching.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver produced from leaching
|
| Copper | .164 | .086
|
| Zinc | .126 | .053
|
| Ammonia (as N) | 11.470 | 5.040
|
| Total suspended solids | 3.526 | 1.677
|
| pH | (
1) | (
1)
|
(i) Subpart L—Leaching Wet Air Pollution Control and Precipitation of Nonphotographic Solutions Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver produced from leaching or silver precipitated
|
| Copper | 8.417 | 4.430
|
| Zinc | 6.468 | 2.703
|
| Ammonia (as N) | 590.500 | 259.600
|
| Total suspended solids | 181.700 | 86.390
|
| pH | (
1) | (
1)
|
(j) Subpart L—Precipitation and Filtration of Nonphotographic Solutions.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver precipitated
|
| Copper | 5.833 | 3.070
|
| Zinc | 4.482 | 1.873
|
| Ammonia (as N) | 409.300 | 179.900
|
| Total suspended solids | 125.900 | 59.870
|
| pH | (
1) | (
1)
|
(k) Subpart L—Floor and Equipment Washdown.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver production
|
| Copper | .000 | .000
|
| Zinc | .000 | .000
|
| Ammonia (as N) | .000 | .000
|
| Total suspended solids | .000 | .000
|
| pH | (
1) | (
1)
|
§ 421.123 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
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 available technology economically achievable:
(a) Subpart L—Film Stripping.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from film stripping
|
| Copper | 64.450 | 30.720
|
| Zinc | 51.360 | 21.150
|
| Ammonia (as N) | 6,712.000 | 2,951.000 |
(b) Subpart L—Film Stripping Wet Air Pollution Control and Precipitation and Filtration of Film Stripping Solutions Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from precipitation and filtration of film stripping solutions
|
| Copper | 1.242 | .592
|
| Zinc | .990 | .408
|
| Ammonia (as N) | 129.300 | 56.840 |
(c) Subpart L—Precipitation and Filtration of Film Stripping Solutions.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver precipitated
|
| Copper | 73.690 | 35.120
|
| Zinc | 58.720 | 24.180
|
| Ammonia (as N) | 7,674.000 | 3,374.000 |
(d) Subpart L—Precipitation and Filtration of Photographic Solutions.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver precipitated
|
| Copper | 34.048 | 16.226
|
| Zinc | 27.132 | 11.172
|
| Ammonia (as N) | 3,545.000 | 1,559.000 |
(e) Subpart L—Precipitation and Filtration of Photographic Solutions Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from precipitation and filtration of photographic solutions
|
| Copper | 15.540 | 7.406
|
| Zinc | 12.380 | 5.099
|
| Ammonia (as N) | 1,618.000 | 711.400 |
(f) Subpart L—Electrolytic Refining.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from electrolytic refining
|
| Copper | .973 | .464
|
| Zinc | .775 | .319
|
| Ammonia (as N) | 101.300 | 44.540 |
(g) Subpart L—Furnace Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver roasted, smelted, or dried
|
| Copper | .000 | .000
|
| Zinc | .000 | .000
|
| Ammonia (as N) | .000 | .000 |
(h) Subpart L—Leaching.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver produced from leaching
|
| Copper | .110 | .053
|
| Zinc | .088 | .036
|
| Ammonia (as N) | 11.470 | 5.040 |
(i) Subpart L—Leaching Wet Air Pollution Control and Precipitation of Nonphotographic Solutions Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver produced from leaching or silver precipitated
|
| Copper | 5.671 | 2.703
|
| Zinc | 4.519 | 1.861
|
| Ammonia (as N) | 590.500 | 259.600 |
(j) Subpart L—Precipitation and Filtration of Nonphotographic Solutions.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver precipitated
|
| Copper | 3.930 | 1.873
|
| Zinc | 3.132 | 1.290
|
| Ammonia (as N) | 409.300 | 179.900 |
(k) Subpart L—Floor and Equipment Washdown.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver production
|
| Copper | .000 | .000
|
| Zinc | .000 | .000
|
| Ammonia (as N) | .000 | .000 |
§ 421.124 - Standards of performance for new sources.
Any new source subject to this subpart shall achieve the following new source performance standards:
(a) Subpart L—Film Stripping.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from film stripping
|
| Copper | 64.450 | 30.720
|
| Zinc | 51.360 | 21.150
|
| Ammonia (as N) | 6,712.000 | 2,951.000
|
| Total suspended solids | 755.300 | 604.200
|
| pH | (
1) | (
1)
|
(b) Subpart L—Film Stripping Wet Air Pollution Control and Precipitation and Filtration of Film Stripping Solutions Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from precipitation and filtration of film stripping solutions
|
| Copper | 1.242 | .592
|
| Zinc | .990 | .408
|
| Ammonia (as N) | 129.300 | 56.840
|
| Total suspended solids | 14.550 | 11.640
|
| pH | (
1) | (
1)
|
(c) Subpart L—Precipitation and Filtration of Film Stripping Solutions.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver precipitated
|
| Copper | 73.690 | 35.120
|
| Zinc | 58.720 | 24.180
|
| Ammonia (as N) | 7,674.000 | 3,374.000
|
| Total suspended solids | 863.600 | 690.900
|
| pH | (
1) | (
1)
|
(d) Subpart L—Precipitation and Filtration of Photographic Solutions.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver precipitated
|
| Copper | 34.048 | 16.226
|
| Zinc | 27.132 | 11.172
|
| Ammonia (as N) | 3,545.000 | 1,559.000
|
| Total suspended solids | 399.000 | 319.200
|
| pH | (
1) | (
1)
|
(e) Subpart L—Precipitation and Filtration of Photographic Solutions Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from precipitation and filtration of photographic solutions
|
| Copper | 15.540 | 7.406
|
| Zinc | 12.380 | 5.099
|
| Ammonia (as N) | 1,618.000 | 711.400
|
| Total suspended solids | 182.100 | 145.700
|
| pH | (
1) | (
1)
|
(f) Subpart L—Electrolytic Refining.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from electrolytic refining
|
| Copper | .973 | .464
|
| Zinc | .775 | .319
|
| Ammonia (as N) | 101.300 | 44.540
|
| Total suspended solids | 11.400 | 9.120
|
| pH | (
1) | (
1)
|
(g) Subpart L—Furnace Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver roasted, smelted, or dried
|
| Copper | .000 | .000
|
| Zinc | .000 | .000
|
| Ammonia (as N) | .000 | .000
|
| Total suspended solids | .000 | .000
|
| pH | (
1) | (
1)
|
(h) Subpart L—Leaching.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver produced from leaching
|
| Copper | .110 | .053
|
| Zinc | .088 | .036
|
| Ammonia (as N) | 11.470 | 5.040
|
| Total suspended solids | 1.290 | 1.032
|
| pH | (
1) | (
1)
|
(i) Subpart L—Leaching Wet Air Pollution Control and Precipitation of Nonphotographic Solutions Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver produced from leaching or silver precipitated
|
| Copper | 5.671 | 2.703
|
| Zinc | 4.519 | 1.861
|
| Ammonia (as N) | 590.500 | 259.600
|
| Total suspended solids | 66.450 | 53.160
|
| pH | (
1) | (
1)
|
(j) Subpart L—Precipitation and Filtration of Nonphotograhic Solutions.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver precipitated
|
| Copper | 3.930 | 1.873
|
| Zinc | 3.132 | 1.290
|
| Ammonia (as N) | 409.300 | 179.900
|
| Total suspended solids | 46.050 | 36.840
|
| pH | (
1) | (
1)
|
(k) Subpart L—Floor and Equipment Washdown.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver production
|
| Copper | .000 | .000
|
| Zinc | .000 | .000
|
| Ammonia (as N) | .000 | .000
|
| Total suspended solids | .000 | .000
|
| pH | (
1) | (
1)
|
§ 421.125 - Pretreatment standards for existing sources.
Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources. The mass of wastewater pollutants in secondary silver process wastewater introduced into a POTW must not exceed the following values.
(a) Subpart L—Film Stripping.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from film stripping
|
| Copper | 64.450 | 30.720
|
| Zinc | 51.360 | 21.150
|
| Ammonia (as N) | 6,712.000 | 2,951.000 |
(b) Subpart L—Film Stripping Wet Air Pollution Control and Precipitation and Filtration of Film Stripping Solutions Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from precipitation and filtration of film stripping solutions
|
| Copper | 1.242 | .592
|
| Zinc | .990 | .408
|
| Ammonia (as N) | 129.300 | 56.840 |
(c) Subpart L—Precipitation and Filtration of Film Stripping Solutions.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver precipitated
|
| Copper | 73.690 | 35.120
|
| Zinc | 58.720 | 24.180
|
| Ammonia (as N) | 7,674.000 | 3,374.000 |
(d) Subpart L—Precipitation and Filtration of Photographic Solutions.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver precipitated
|
| Copper | 34.048 | 16.226
|
| Zinc | 27.132 | 11.172
|
| Ammonia (as N) | 3,545.000 | 1,559.000 |
(e) Subpart L—Precipitation and Filtration of Photographic Solutions Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from precipitation and filtration of photographic solutions
|
| Copper | 15.540 | 7.406
|
| Zinc | 12.380 | 5.099
|
| Ammonia (as N) | 1,618.000 | 711.400 |
(f) Subpart L—Electrolytic Refining.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from electrolytic refining
|
| Copper | .973 | .464
|
| Zinc | .775 | .319
|
| Ammonia (as N) | 101.300 | 44.540 |
(g) Subpart L—Furnace Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver roasted, smelted, or dried
|
| Copper | .000 | .000
|
| Zinc | .000 | .000
|
| Ammonia (as N) | .000 | .000 |
(h) Subpart L—Leaching.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver produced from leaching
|
| Copper | .110 | .053
|
| Zinc | .088 | .036
|
| Ammonia (as N) | 11.470 | 5.040 |
(i) Subpart L—Leaching Wet Air Pollution Control and Precipitation of Nonphotographic Solutions Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver produced from leaching or silver precipitated
|
| Copper | 5.671 | 2.703
|
| Zinc | 4.519 | 1.861
|
| Ammonia (as N) | 590.500 | 259.600 |
(j) Subpart L—Precipitation and Filtration of Nonphotographic Solutions.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver precipitated
|
| Copper | 3.930 | 1.873
|
| Zinc | 3.132 | 1.290
|
| Ammonia (as N) | 409.300 | 179.900 |
(k) Subpart L—Floor and Equipment Washdown.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver production
|
| Copper | .000 | .000
|
| Zinc | .000 | .000
|
| Ammonia (as N) | .000 | .000 |
§ 421.126 - Pretreatment standards for new sources.
Except as provided in 40 CFR 403.7, any new source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for new sources. The mass of wastewater pollutants in secondary silver process wastewater introduced into a POTW shall not exceed the following values:
(a) Subpart L—Film Stripping.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from film stripping
|
| Copper | 64.450 | 30.720
|
| Zinc | 51.360 | 21.150
|
| Ammonia (as N) | 6,712.000 | 2,951.000 |
(b) Subpart L—Film Stripping Wet Air Pollution Control and Precipitation and Filtration of Film Stripping Solutions Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from precipitation and filtration of film stripping solutions
|
| Copper | 1.242 | .592
|
| Zinc | .990 | .408
|
| Ammonia (as N) | 129.300 | 56.840 |
(c) Subpart L—Precipitation and Filtration of Film Stripping Solutions.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver precipitated
|
| Copper | 73.690 | 35.120
|
| Zinc | 58.720 | 24.180
|
| Ammonia (as N) | 7,674.000 | 3,374.000 |
(d) Subpart L—Precipitation and Filtration of Photographic Solutions.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver precipitated
|
| Copper | 34.048 | 16.226
|
| Zinc | 27.132 | 11.172
|
| Ammonia (as N) | 3,545.000 | 1,559.000 |
(e) Subpart L—Precipitation and Filtration of Photographic Solutions Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from precipitation and filtration of photographic solutions
|
| Copper | 15.540 | 7.406
|
| Zinc | 12.380 | 5.099
|
| Ammonia (as N) | 1,618.000 | 711.400 |
(f) Subpart L—Electrolytic Refining.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver from electrolytic refining
|
| Copper | .973 | .464
|
| Zinc | .775 | .319
|
| Ammonia (as N) | 101.300 | 44.540 |
(g) Subpart L—Furnace Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver roasted, smelted or dried
|
| Copper | .000 | .000
|
| Zinc | .000 | .000
|
| Ammonia (as N) | .000 | .000 |
(h) Subpart L—Leaching.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver produced from leaching
|
| Copper | .110 | .053
|
| Zinc | .088 | .036
|
| Ammonia (as N) | 11.470 | 5.040 |
(i) Subpart L—Leaching Wet Air Pollution Control and Precipitation of Nonphotographic Solutions Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver produced from leaching or silver precipitated
|
| Copper | 5.671 | 2.703
|
| Zinc | 4.519 | 1.861
|
| Ammonia (as N) | 590.500 | 259.600 |
(j) Subpart L—Precipitation and Filtration of Nonphotographic Solutions.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver precipitated
|
| Copper | 3.930 | 1.873
|
| Zinc | 3.132 | 1.290
|
| Ammonia (as N) | 409.300 | 179.900 |
(k) Subpart L—Floor and Equipment Washdown.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/troy ounce of silver production
|
| Copper | .000 | .000
|
| Zinc | .000 | .000
|
| Ammonia (as N) | .000 | .000 |
§ 421.127 - [Reserved]
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,
c,
e,
and, 1316 (b) and
c, 1317 (b) and
c,
1318; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217; 101 Stat. 7, Pub. L. 100-4
source: 49 FR 8790, Mar. 8, 1984, unless otherwise noted.
cite as: 40 CFR 421.120