Regulations last checked for updates: Feb 12, 2026

Title 40 - Protection of Environment last revised: Dec 22, 2026
All TitlesTitle 40Chapter IPart 420Subpart H - Subpart H—Salt Bath Descaling Subcategory
View all text of Subpart H [§ 420.80 - § 420.87]
§ 420.84 - 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) Salt bath descaling, oxidizing—(1) Batch, sheet and plate.

Subpart H

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
TSS0.2040.0876
Chromium0.002920.00117
Nickel0.002630.000876
pH( 1)( 1)

1 Within the range of 6.0 to 9.0.

(2) Batch, rod and wire.

Subpart H

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
TSS0.1230.0526
Chromium0.001750.000701
Nickel0.001580.000526
pH( 1)( 1)

1 Within the range of 6.0 to 9.0.

(3) Batch, pipe and tube.

Subpart H

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
TSS0.4960.213
Chromium0.007090.00284
Nickel0.006380.00213
pH( 1)( 1)

1 Within the range of 6.0 to 9.0.

(4) Continuous.

Subpart H

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
TSS0.09640.0413
Chromium0.001380.000551
Nickel0.001240.000413
pH( 1)( 1)

1 Within the range of 6.0 to 9.0.

(b) Salt bath descaling, reducing—(1) Batch.

Subpart H

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
TSS0.09490.0407
Cyanide0.001020.000339
Chromium0.001360.000542
Nickel0.001220.000407
pH( 1)( 1)

1 Within the range of 6.0 to 9.0.

(2) Continuous.

Subpart H

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
TSS0.5320.228
Cyanide0.005690.00190
Chromium0.007590.00304
Nickel0.006830.00228
pH( 1)( 1)

1 Within the range of 6.0 to 9.0.

authority: 33 U.S.C. 1311,1314,1316,1317,1318,1342,and
source: 47 FR 23284, May 27, 1982, unless otherwise noted.
cite as: 40 CFR 420.84
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