U.S. Code of Federal Regulations

Regulations most recently checked for updates: Oct 04, 2022

§ 461.31 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).

(a) 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:

(1) Subpart C - Closed Formation - Double Fill, or Fill and Dump.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units - mg/kg of lead used
English units - pounds per 1,000,000 pounds of lead used
Copper0.860.45
Lead0.190.090
Iron0.540.27
Oil and grease9.005.40
TSS18.458.78
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(2) Subpart C - Open Formation - Dehydrated.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units - mg/kg of lead used
English units - pounds per 1,000,000 pounds of lead used
Copper20.9911.05
Lead4.642.21
Iron16.136.74
Oil and grease221.00132.60
TSS453.05215.47
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(3) Subpart C - Open Formation - Wet.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units - mg/kg of lead used
English units - pounds per 1,000,000 pounds of lead used
Copper0.100.05
Lead0.020.01
Iron0.060.03
Oil and grease1.060.64
TSS2.171.03
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(4) Subpart C - Plate Soak.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units - mg/kg of lead used
English units - pounds per 1,000,000 pounds of lead used
Copper0.0400.020
Lead0.0090.004
Iron0.0300.010
Oil and grease0.4200.250
TSS0.8600.410
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(5) Subpart C - Battery Wash (with Detergent).

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units - mg/kg of lead used
English units - pounds per 1,000,000 pounds of lead used
Copper1.710.90
Lead0.380.18
Iron1.080.55
Oil and grease18.0010.80
TSS36.9017.55
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(6) Subpart C - Battery Wash (Water Only).

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units - mg/kg of lead used
English units - pounds per 1,000,000 pounds of lead used
Copper1.120.59
Lead0.250.12
Iron0.710.36
Oil and grease11.807.08
TSS24.1911.51
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(7) Subpart C - Direct Chill Lead Casting.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units - mg/kg of lead used
English units - pounds per 1,000,000 pounds of lead used
Copper0.000400.00020
Lead0.000080.00004
Iron0.000200.00010
Oil and grease0.004000.00200
TSS0.008000.00300
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(8) Subpart C - Mold Release Formulation.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units - mg/kg of lead used
English units - pounds per 1,000,000 pounds of lead used
Copper0.0110.006
Lead0.0020.001
Iron0.0070.004
Oil and grease0.1200.072
TSS0.2460.117
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(9) Subpart C - Truck Wash.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units - mg/kg of lead in trucked batteries
English units - pounds per 1,000,000 pounds of lead in trucked batteries
Copper0.0260.014
Lead0.0050.002
Iron0.0160.008
Oil and grease0.2800.168
TSS0.5740.273
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(10) Subpart C - Laundry.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units - mg/kg of lead used
English units - pounds per 1,000,000 pounds of lead used
Copper0.210.11
Lead0.050.02
Iron0.130.07
Oil and grease2.181.31
TSS4.472.13
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(11) Subpart C - Miscellaneous Wastewater Streams.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
Metric units - mg/kg of lead used
English units - pounds per 1,000,000 pounds of lead used
Copper0.810.43
Lead0.180.09
Iron0.510.26
Oil and grease8.545.12
TSS17.518.33
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(b) There shall be no discharge allowance for process wastewater pollutants from any battery manufacturing operation other than those battery manufacturing operations listed above.

[49 FR 9134, Mar. 9, 1984; 49 FR 13879, Apr. 9, 1984]