Federal regulations · Through 2026-08-25 · Newer source version available

40 CFR 420.92: 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 representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
(a) Sulfuric acid pickling (spent acid solutions and rinse waters)—(1) Rod, wire and coil.
Subpart I
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.0818 0.0350
O&G 1 0.0350 0.0117
Lead 0.000526 0.000175
Zinc 0.000701 0.000234
pH (2) (2)
1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.
2 Within the range of 6.0 to 9.0.
(2) Bar, billet and bloom.
Subpart I
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.0263 0.0113
O&G 1 0.0113 0.00375
Lead 0.000169 0.0000563
Zinc 0.000225 0.0000751
pH (2) (2)
1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.
2 Within the range of 6.0 to 9.0.
(3) Strip, sheet and plate.
Subpart I
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.0526 0.0225
O&G 1 0.0225 0.00751
Lead 0.000338 0.000113
Zinc 0.000451 0.000150
pH (2) (2)
1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.
2 Within the range of 6.0 to 9.0.
(4) Pipe, tube and other products.
Subpart I
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.146 0.0626
O&G 1 0.0626 0.0209
Lead 0.000939 0.000313
Zinc 0.00125 0.000417
pH (2) (2)
1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.
2 Within the range of 6.0 to 9.0.
(5) Fume scrubbers.
Subpart I
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kilograms per day
TSS 5.72 2.45
O&G 1 2.45 0.819
Lead 0.0368 0.0123
Zinc 0.0491 0.0164
pH (2) (2)
1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.
2 Within the range of 6.0 to 9.0.
The above limitations shall be applicable to each fume scrubber associated with a sulfuric acid pickling operation.
(b) Hydrochloric acid pickling (spent acid solutions and rinse waters)—(1) Rod, wire and coil.
Subpart I
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.143 0.0613
O&G 1 0.0613 0.0204
Lead 0.000920 0.000307
Zinc 0.00123 0.000409
pH (2) (2)
1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.
2 Within the range of 6.0 to 9.0.
(2) Strip, sheet and plate.
Subpart I
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.0818 0.0350
O&G 1 0.0350 0.0117
Lead 0.000526 0.000175
Zinc 0.000701 0.000234
pH (2) (2)
1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.
2 Within the range of 6.0 to 9.0.
(3) Pipe, tube and other products.
Subpart I
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.298 0.128
O&G 1 0.128 0.0426
Lead 0.00192 0.000638
Zinc 0.00255 0.000851
pH (2) (2)
1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.
2 Within the range of 6.0 to 9.0.
(4) Fume scrubbers.
Subpart I
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kilograms per day
TSS 5.72 2.45
O&G 1 2.45 0.819
Lead 0.0368 0.0123
Zinc 0.0491 0.0164
pH (2) (2)
1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.
2 Within the range of 6.0 to 9.0.
The above limitations shall be applicable to each fume scrubber associated with a hydrochloric acid pickling operation.
(5) Acid regeneration (absorber vent scrubber).
Subpart I
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kilograms per day
TSS 38.2 16.3
O&G 1 16.3 5.45
Lead 0.245 0.0819
Zinc 0.327 0.109
pH (2) (2)
1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.
2 Within the range of 6.0 to 9.0.
The above limitations shall be applicable to the absorber vent scrubber wastewater associated with hydrochloric acid regeneration plants.
(c) Combination acid pickling (spent acid solution and rinse waters)—(1) Rod, Wire, and Coil.
Subpart I
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.149 0.0638
O&G 1 0.0638 0.0213
Chromium 0.00213 0.000852
Nickel 0.00192 0.000638
pH (2) (2)
1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.
2 Within the range of 6.0 to 9.0.
(2) Bar, billet, and bloom.
Subpart I
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.0672 0.0288
O&G 1 0.0288 0.00960
Chromium 0.000960 0.000384
Nickel 0.000864 0.000288
pH (2) (2)
1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.
2 Within the range of 6.0 to 9.0.
(3) Strip, sheet, and plate—continuous.
Subpart I
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.438 0.188
O&G 1 0.188 0.0626
Chromium 0.00626 0.00250
Nickel 0.00563 0.00188
pH (2) (2)
1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.
2 Within the range of 6.0 to 9.0.
(4) Strip, sheet and plate—batch.
Subpart I
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.134 0.0576
O&G 1 0.0576 0.0192
Chromium 0.00192 0.000768
Nickel 0.00173 0.000576
pH (2) (2)
1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.
2 Within the range of 6.0 to 9.0.
(5) Pipe, tube, and other products.
Subpart I
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.225 0.0964
O&G 1 0.0964 0.0322
Chromium 0.00322 0.00129
Nickel 0.00289 0.000964
pH (2) (2)
1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.
2 Within the range of 6.0 to 9.0.
(6) Fume scrubbers.
Subpart I
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kilograms per day
TSS 5.72 2.45
O&G 1 2.45 0.819
Chromium 0.0819 0.0327
Nickel 0.0735 0.0245
pH (2) (2)
1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.
2 Within the range of 6.0 to 9.0.
The above limitations shall be applicable to each fume scrubber associated with a combination acid pickling operation.

Where this section sits in the code

Title 40—Protection of Environment
CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY
SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS
PART 420—IRON AND STEEL MANUFACTURING POINT SOURCE CATEGORY
Subpart I—Acid Pickling Subcategory

(a) Sulfuric acid pickling (spent acid solutions and rinse waters)—(1) Rod, wire and coil.

Subpart I

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Average of daily values for 30 consecutive days

Kg/kkg (pounds per 1,000 lb) of product

TSS 0.0818 0.0350

O&G 1 0.0350 0.0117

Lead 0.000526 0.000175

Zinc 0.000701 0.000234

pH (2) (2)

1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.

2 Within the range of 6.0 to 9.0.

(2) Bar, billet and bloom.

Subpart I

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Average of daily values for 30 consecutive days

Kg/kkg (pounds per 1,000 lb) of product

TSS 0.0263 0.0113

O&G 1 0.0113 0.00375

Lead 0.000169 0.0000563

Zinc 0.000225 0.0000751

pH (2) (2)

1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.

2 Within the range of 6.0 to 9.0.

(3) Strip, sheet and plate.

Subpart I

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Average of daily values for 30 consecutive days

Kg/kkg (pounds per 1,000 lb) of product

TSS 0.0526 0.0225

O&G 1 0.0225 0.00751

Lead 0.000338 0.000113

Zinc 0.000451 0.000150

pH (2) (2)

1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.

2 Within the range of 6.0 to 9.0.

(4) Pipe, tube and other products.

Subpart I

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Average of daily values for 30 consecutive days

Kg/kkg (pounds per 1,000 lb) of product

TSS 0.146 0.0626

O&G 1 0.0626 0.0209

Lead 0.000939 0.000313

Zinc 0.00125 0.000417

pH (2) (2)

1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.

2 Within the range of 6.0 to 9.0.

(5) Fume scrubbers.

Subpart I

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Average of daily values for 30 consecutive days

Kilograms per day

TSS 5.72 2.45

O&G 1 2.45 0.819

Lead 0.0368 0.0123

Zinc 0.0491 0.0164

pH (2) (2)

1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.

2 Within the range of 6.0 to 9.0.

The above limitations shall be applicable to each fume scrubber associated with a sulfuric acid pickling operation.

(b) Hydrochloric acid pickling (spent acid solutions and rinse waters)—(1) Rod, wire and coil.

Subpart I

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Average of daily values for 30 consecutive days

Kg/kkg (pounds per 1,000 lb) of product

TSS 0.143 0.0613

O&G 1 0.0613 0.0204

Lead 0.000920 0.000307

Zinc 0.00123 0.000409

pH (2) (2)

1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.

2 Within the range of 6.0 to 9.0.

(2) Strip, sheet and plate.

Subpart I

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Average of daily values for 30 consecutive days

Kg/kkg (pounds per 1,000 lb) of product

TSS 0.0818 0.0350

O&G 1 0.0350 0.0117

Lead 0.000526 0.000175

Zinc 0.000701 0.000234

pH (2) (2)

1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.

2 Within the range of 6.0 to 9.0.

(3) Pipe, tube and other products.

Subpart I

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Average of daily values for 30 consecutive days

Kg/kkg (pounds per 1,000 lb) of product

TSS 0.298 0.128

O&G 1 0.128 0.0426

Lead 0.00192 0.000638

Zinc 0.00255 0.000851

pH (2) (2)

1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.

2 Within the range of 6.0 to 9.0.

(4) Fume scrubbers.

Subpart I

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Average of daily values for 30 consecutive days

Kilograms per day

TSS 5.72 2.45

O&G 1 2.45 0.819

Lead 0.0368 0.0123

Zinc 0.0491 0.0164

pH (2) (2)

1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.

2 Within the range of 6.0 to 9.0.

The above limitations shall be applicable to each fume scrubber associated with a hydrochloric acid pickling operation.

(5) Acid regeneration (absorber vent scrubber).

Subpart I

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Average of daily values for 30 consecutive days

Kilograms per day

TSS 38.2 16.3

O&G 1 16.3 5.45

Lead 0.245 0.0819

Zinc 0.327 0.109

pH (2) (2)

1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.

2 Within the range of 6.0 to 9.0.

The above limitations shall be applicable to the absorber vent scrubber wastewater associated with hydrochloric acid regeneration plants.

Subpart I

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Average of daily values for 30 consecutive days

Kg/kkg (pounds per 1,000 lb) of product

TSS 0.149 0.0638

O&G 1 0.0638 0.0213

Chromium 0.00213 0.000852

Nickel 0.00192 0.000638

pH (2) (2)

1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.

2 Within the range of 6.0 to 9.0.

(2) Bar, billet, and bloom.

Subpart I

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Average of daily values for 30 consecutive days

Kg/kkg (pounds per 1,000 lb) of product

TSS 0.0672 0.0288

O&G 1 0.0288 0.00960

Chromium 0.000960 0.000384

Nickel 0.000864 0.000288

pH (2) (2)

1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.

2 Within the range of 6.0 to 9.0.

(3) Strip, sheet, and plate—continuous.

Subpart I

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Average of daily values for 30 consecutive days

Kg/kkg (pounds per 1,000 lb) of product

TSS 0.438 0.188

O&G 1 0.188 0.0626

Chromium 0.00626 0.00250

Nickel 0.00563 0.00188

pH (2) (2)

1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.

2 Within the range of 6.0 to 9.0.

(4) Strip, sheet and plate—batch.

Subpart I

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Average of daily values for 30 consecutive days

Kg/kkg (pounds per 1,000 lb) of product

TSS 0.134 0.0576

O&G 1 0.0576 0.0192

Chromium 0.00192 0.000768

Nickel 0.00173 0.000576

pH (2) (2)

1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.

2 Within the range of 6.0 to 9.0.

(5) Pipe, tube, and other products.

Subpart I

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Average of daily values for 30 consecutive days

Kg/kkg (pounds per 1,000 lb) of product

TSS 0.225 0.0964

O&G 1 0.0964 0.0322

Chromium 0.00322 0.00129

Nickel 0.00289 0.000964

pH (2) (2)

1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.

2 Within the range of 6.0 to 9.0.

(6) Fume scrubbers.

Subpart I

Pollutant or pollutant property BPT effluent limitations

Maximum for any 1 day Average of daily values for 30 consecutive days

Kilograms per day

TSS 5.72 2.45

O&G 1 2.45 0.819

Chromium 0.0819 0.0327

Nickel 0.0735 0.0245

pH (2) (2)

1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.

2 Within the range of 6.0 to 9.0.

The above limitations shall be applicable to each fume scrubber associated with a combination acid pickling operation.

Collected 2026-08-27T02:26:04Z. Source file · JSON

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