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

40 CFR 420.94: New source performance standards (NSPS).

The discharge of wastewater pollutants from any new source subject to this subpart shall not exceed the standards set forth below.
(a) Sulfuric acid pickling (spent acid solutions and rinse waters)—(1) Rod, wire, and coil.
Subpart I
Pollutant or pollutant property New source performance standards
Maximum for any 1 day Average of daily values for 30 consecutive days
kg/kkg (pounds per 1,000 lb) of product
TSS 0.0146 0.00626
O&G* 0.00626 0.00209
Lead 0.0000939 0.0000313
Zinc 0.000125 0.0000417
pH (1) (1)
*The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.
1 Within the range of 6.0 to 9.0.
(2) Bar, billet, and bloom.
Subpart I
Pollutant or pollutant property New source performance standards
Maximum for any 1 day Average of daily values for 30 consecutive days
kg/kkg (pounds per 1,000 lb) of product
TSS 0.00876 0.00376
O&G* 0.00376 0.00125
Lead 0.0000563 0.0000188
Zinc 0.0000751 0.0000250
pH (1) (1)
*The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.
1 Within the range of 6.0 to 9.0.
(3) Strip, sheet, and plate.
Subpart I
Pollutant or pollutant property New source performance standards
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.0117 0.00501
O&G 1 0.00501 0.00167
Lead 0.0000751 0.0000250
Zinc 0.000100 0.0000334
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 New source performance standars
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.0204 0.00876
O&G 1 0.00876 0.00292
Lead 0.000131 0.0000438
Zinc 0.000175 0.0000584
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 New source performance standars
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 New source performance standards
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.0175 0.00751
O&G 1 0.00751 0.00250
Lead 0.000113 0.0000376
Zinc 0.000150 0.0000501
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 New source performance standards
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.0117 0.00501
O&G 1 0.00501 0.00167
Lead 0.0000751 0.0000250
Zinc 0.000100 0.0000334
pH (2) (2)
1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.
1 Within the range of 6.0 to 9.0.
(3) Pipe, tube, and other products.
Subpart I
Pollutant or pollutant property New source performance standards
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.0321 0.0138
O&G 1 0.0138 0.00459
Lead 0.000206 0.0000688
Zinc 0.000275 0.0000918
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 New source performance standards
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.
(c) Combination acid pickling (spent acid solutions and rinse waters)—(1) Rod, wire, and coil.
Subpart I
Pollutant or pollutant property New source performance standards
Maximum for any 1 day Average of daily values for 30 consecutive days
kg/kkg (pounds per 1,000 lb) of product
TSS 0.0204 0.00876
O&G 1 0.00876 0.00292
Chromium 0.000292 0.000117
Nickel 0.000263 0.0000876
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 New source performance standards
Maximum for any 1 day Average of daily values for 30 consecutive days
kg/kkg (pounds per 1,000 lb) of product
TSS 0.0117 0.00501
O&G 1 0.00501 0.00167
Chromium 0.000167 0.0000667
Nickel 0.000150 0.0000501
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 New source performance standards
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.0496 0.0213
O&G 1 0.0213 0.00710
Chromium 0.000710 0.000284
Nickel 0.000638 0.000213
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 New source performance standards
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.0175 0.00751
O&G 1 0.00751 0.00250
Chromium 0.000250 0.000100
Nickel 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.
(5) Pipe, tube, and other products.
Subpart I
Pollutant or pollutant property New source performance standards
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.0292 0.0125
O&G 1 0.0125 0.00418
Chromium 0.000418 0.000167
Nickel 0.000376 0.000125
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 New source performance standards
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

The discharge of wastewater pollutants from any new source subject to this subpart shall not exceed the standards set forth below.

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

Subpart I

Pollutant or pollutant property New source performance standards

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

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

TSS 0.0146 0.00626

O&G* 0.00626 0.00209

Lead 0.0000939 0.0000313

Zinc 0.000125 0.0000417

pH (1) (1)

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

1 Within the range of 6.0 to 9.0.

(2) Bar, billet, and bloom.

Subpart I

Pollutant or pollutant property New source performance standards

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

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

TSS 0.00876 0.00376

O&G* 0.00376 0.00125

Lead 0.0000563 0.0000188

Zinc 0.0000751 0.0000250

pH (1) (1)

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

1 Within the range of 6.0 to 9.0.

(3) Strip, sheet, and plate.

Subpart I

Pollutant or pollutant property New source performance standards

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

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

TSS 0.0117 0.00501

O&G 1 0.00501 0.00167

Lead 0.0000751 0.0000250

Zinc 0.000100 0.0000334

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 New source performance standars

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

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

TSS 0.0204 0.00876

O&G 1 0.00876 0.00292

Lead 0.000131 0.0000438

Zinc 0.000175 0.0000584

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 New source performance standars

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 New source performance standards

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

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

TSS 0.0175 0.00751

O&G 1 0.00751 0.00250

Lead 0.000113 0.0000376

Zinc 0.000150 0.0000501

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 New source performance standards

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

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

TSS 0.0117 0.00501

O&G 1 0.00501 0.00167

Lead 0.0000751 0.0000250

Zinc 0.000100 0.0000334

pH (2) (2)

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

1 Within the range of 6.0 to 9.0.

(3) Pipe, tube, and other products.

Subpart I

Pollutant or pollutant property New source performance standards

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

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

TSS 0.0321 0.0138

O&G 1 0.0138 0.00459

Lead 0.000206 0.0000688

Zinc 0.000275 0.0000918

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 New source performance standards

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.

Subpart I

Pollutant or pollutant property New source performance standards

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

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

TSS 0.0204 0.00876

O&G 1 0.00876 0.00292

Chromium 0.000292 0.000117

Nickel 0.000263 0.0000876

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 New source performance standards

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

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

TSS 0.0117 0.00501

O&G 1 0.00501 0.00167

Chromium 0.000167 0.0000667

Nickel 0.000150 0.0000501

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 New source performance standards

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

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

TSS 0.0496 0.0213

O&G 1 0.0213 0.00710

Chromium 0.000710 0.000284

Nickel 0.000638 0.000213

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 New source performance standards

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

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

TSS 0.0175 0.00751

O&G 1 0.00751 0.00250

Chromium 0.000250 0.000100

Nickel 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.

(5) Pipe, tube, and other products.

Subpart I

Pollutant or pollutant property New source performance standards

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

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

TSS 0.0292 0.0125

O&G 1 0.0125 0.00418

Chromium 0.000418 0.000167

Nickel 0.000376 0.000125

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 New source performance standards

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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