CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS (Parts 400–471) > PART 437—THE CENTRALIZED WASTE TREATMENT POINT SOURCE CATEGORY > SUBPART D—Multiple Wastestreams (§437.40 to §437.47) > 437.42—Effluent limitations attainable by the application of the best practicable control technology currently available (BPT).

437.42—Effluent limitations 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 or § 437.40(b), any existing facility subject to this subpart which combines treated or untreated wastes from subparts A, B, or C of this part may be subject to Multiple Wastestream Subcategory effluent limitations representing the application of BPT set forth in paragraphs (b), (c), (d), or (e) of this section if the discharger agrees to the following conditions in its NPDES permit:
(1) The discharger will meet the applicable Multiple Wastestream Subcategory limitations set forth in (b), (c), (d) or (e);
(2) The discharger will notify its NPDES permit writer at the time of renewal or modification of its permit, of its desire to be subject to the Multiple Waste Subcategory by submitting to the NPDES permit writer an initial certification statement as described in § 437.41(a) ;
(3) The discharger will submit to its NPDES permitting authority a periodic certification statement as described in § 437.41(b) once a year; and
(4) The discharger will maintain at the office of the facility and make available for inspection the on-site compliance paperwork as described in § 437.41(c).
(b) Combined waste receipts from subparts A, B, and C of this part. (1) As provided in § 437.42(a), any existing point source subject to this paragraph must achieve the following effluent limitations representing the application of BPT:
BPT Limitations
Regulatedparameter Maximum daily 1 Maximum monthly avg. 1
Conventional Parameters
BOD5 163 53.0
O&G 127 38.0
pH (2) (2)
TSS 74.1 30.6
Metal Parameters
Antimony 0.249 0.206
Arsenic 0.162 0.104
Cadmium 0.0172 0.0102
Chromium 0.746 0.323
Cobalt 0.192 0.124
Copper 0.500 0.242
Lead 0.350 0.160
Mercury 0.00234 0.000739
Nickel 3.95 1.45
Silver 0.120 0.0351
Tin 0.409 0.120
Titanium 0.0947 0.0618
Vanadium 0.218 0.0662
Zinc 0.497 0.420
Organic Parameters
Acetone 30.2 7.97
Acetophenone 0.114 0.0562
Bis(2-ethylhexyl) phthalate 0.215 0.101
2-Butanone 4.81 1.85
Butylbenzyl phthalate 0.188 0.0887
Carbazole 0.598 0.276
o-Cresol 1.92 0.561
p-Cresol 0.698 0.205
n-Decane 0.948 0.437
Fluoranthene 0.0537 0.0268
n-Octadecane 0.589 0.302
Phenol 3.65 1.08
Pyridine 0.370 0.182
2,4,6-Trichlorophenol 0.155 0.106
1 mg/L (ppm).
2 OSC Within the range 6 to 9.
(2) The following in-plant limitations apply to metal-bearing wastewater containing cyanide:
In-Plant Limitations
Regulatedparameter Maximum daily 1 Maximum monthly avg. 1
Cyanide 500 178
1 mg/L (ppm).
(c) Combined waste receipts from subparts A and B of this part. (1) As provided in § 437.42(a), any existing point source subject to this paragraph must achieve the following effluent limitations representing the application of BPT:
BPT Limitations
Regulatedparameter Maximum daily 1 Maximum monthly avg. 1
Conventional Parameters
O&G 127 38.0
pH (2) (2)
TSS 74.1 30.6
Metal Parameters
Antimony 0.249 0.206
Arsenic 0.162 0.104
Cadmium 0.0172 0.0102
Chromium 0.746 0.323
Cobalt 0.192 0.124
Copper 0.500 0.242
Lead 0.350 0.160
Mercury 0.00234 0.000739
Nickel 3.95 1.45
Silver 0.120 0.0351
Tin 0.409 0.120
Titanium 0.0947 0.0618
Vanadium 0.218 0.0662
Zinc 2.87 0.641
Organic Parameters
Bis(2-ethylhexyl) phthalate 0.215 0.101
Butylbenzyl phthalate 0.188 0.0887
Carbazole 0.598 0.276
n-Decane 0.948 0.437
Fluoranthene 0.0537 0.0268
n-Octadecane 0.589 0.302
1 mg/L (ppm).
2 Within the range 6 to 9.
(2) The following in-plant limitations apply to metal-bearing wastewater containing cyanide:
In-Plant Limitations
Regulatedparameter Maximum daily 1 Maximum monthly avg. 1
Cyanide 500 178
1 mg/L (ppm).
(d) Combined waste receipts from subparts A and C of this part. (1) As provided in § 437.42(a), any existing point source subject to this paragraph must achieve the following effluent limitations representing the application of BPT:
BPT Limitations
Regulatedparameter Maximum daily 1 Maximum monthly avg. 1
Conventional Parameters
BOD 5 163 53.0
O&G 205 50.2
pH (2) (2)
TSS 60.0 31.0
Metal Parameters
Antimony 0.249 0.206
Arsenic 0.162 0.104
Cadmium 0.474 0.0962
Chromium 15.5 3.07
Cobalt 0.192 0.124
Copper 0.865 0.757
Lead 1.32 0.283
Mercury 0.00234 0.000739
Nickel 3.95 1.45
Silver 0.120 0.0351
Tin 0.409 0.120
Titanium 0.0947 0.0618
Vanadium 0.218 0.0662
Zinc 0.497 0.420
Organic Parameters
Acetone 30.2 7.97
Acetophenone 0.114 0.0562
2-Butanone 4.81 1.85
o-Cresol 1.92 0.561
p-Cresol 0.698 0.205
Phenol 3.65 1.08
Pyridine 0.370 0.182
2,4,6-Trichlorophenol 0.155 0.106
1 mg/L (ppm).
2 Within the range 6 to 9.
(2) The following in-plant limitations apply to metal-bearing wastewater containing cyanide:
In-Plant Limitations
Regulatedparameter Maximum daily 1 Maximum monthly avg. 1
Cyanide 500 178
1 mg/L )ppm).
(e) Combined waste receipts from subparts B and C of this part. As provided in § 437.42(a), any existing point source subject to this paragraph must achieve the following effluent limitations representing the application of BPT:
BPT Limitations
Regulatedparameter Maximum daily 1 Maximum monthly avg. 1
Conventional Parameters
BOD5 163 53.0
O&G 127 38.0
pH (2) (2)
TSS 74.1 30.6
Metal Parameters
Arsenic 2.95 1.33
Cadmium 0.0172 0.0102
Chromium 0.746 0.323
Cobalt 56.4 18.8
Copper 0.500 0.242
Lead 0.350 0.160
Mercury 0.0172 0.00647
Tin 0.335 0.165
Zinc 0.497 0.420
Organic Parameters
Acetone 30.2 7.97
Acetophenone 0.114 0.0562
Bis(2-ethylhexyl) phthalate 0.215 0.101
2-Butanone 4.81 1.85
Butylbenzyl phthalate 0.188 0.0887
Carbazole 0.598 0.276
o-Cresol 1.92 0.561
p-Cresol 0.698 0.205
n-Decane 0.948 0.437
Fluoranthene 0.0537 0.0268
n-Octadecane 0.589 0.302
Phenol 3.65 1.08
Pyridine 0.370 0.182
2,4,6-Trichlorophenol 0.155 0.106
1 mg/L (ppm).
2 Within the range 6 to 9.

Code of Federal Regulations

[65 FR 81300, Dec. 22, 2000, as amended at 68 FR 71023, 71024, Dec. 22, 2003]
(a) Except as provided in 40 CFR 125.30 through 125.32 or § 437.40(b), any existing facility subject to this subpart which combines treated or untreated wastes from subparts A, B, or C of this part may be subject to Multiple Wastestream Subcategory effluent limitations representing the application of BPT set forth in paragraphs (b), (c), (d), or (e) of this section if the discharger agrees to the following conditions in its NPDES permit:
(1) The discharger will meet the applicable Multiple Wastestream Subcategory limitations set forth in (b), (c), (d) or (e);
(2) The discharger will notify its NPDES permit writer at the time of renewal or modification of its permit, of its desire to be subject to the Multiple Waste Subcategory by submitting to the NPDES permit writer an initial certification statement as described in § 437.41(a) ;
(3) The discharger will submit to its NPDES permitting authority a periodic certification statement as described in § 437.41(b) once a year; and
(4) The discharger will maintain at the office of the facility and make available for inspection the on-site compliance paperwork as described in § 437.41(c).
(b) Combined waste receipts from subparts A, B, and C of this part. (1) As provided in § 437.42(a), any existing point source subject to this paragraph must achieve the following effluent limitations representing the application of BPT:
BPT Limitations
Regulatedparameter Maximum daily 1 Maximum monthly avg. 1
Conventional Parameters
BOD5 163 53.0
O&G 127 38.0
pH (2) (2)
TSS 74.1 30.6
Metal Parameters
Antimony 0.249 0.206
Arsenic 0.162 0.104
Cadmium 0.0172 0.0102
Chromium 0.746 0.323
Cobalt 0.192 0.124
Copper 0.500 0.242
Lead 0.350 0.160
Mercury 0.00234 0.000739
Nickel 3.95 1.45
Silver 0.120 0.0351
Tin 0.409 0.120
Titanium 0.0947 0.0618
Vanadium 0.218 0.0662
Zinc 0.497 0.420
Organic Parameters
Acetone 30.2 7.97
Acetophenone 0.114 0.0562
Bis(2-ethylhexyl) phthalate 0.215 0.101
2-Butanone 4.81 1.85
Butylbenzyl phthalate 0.188 0.0887
Carbazole 0.598 0.276
o-Cresol 1.92 0.561
p-Cresol 0.698 0.205
n-Decane 0.948 0.437
Fluoranthene 0.0537 0.0268
n-Octadecane 0.589 0.302
Phenol 3.65 1.08
Pyridine 0.370 0.182
2,4,6-Trichlorophenol 0.155 0.106
1 mg/L (ppm).
2 OSC Within the range 6 to 9.
(2) The following in-plant limitations apply to metal-bearing wastewater containing cyanide:
In-Plant Limitations
Regulatedparameter Maximum daily 1 Maximum monthly avg. 1
Cyanide 500 178
1 mg/L (ppm).
(c) Combined waste receipts from subparts A and B of this part. (1) As provided in § 437.42(a), any existing point source subject to this paragraph must achieve the following effluent limitations representing the application of BPT:
BPT Limitations
Regulatedparameter Maximum daily 1 Maximum monthly avg. 1
Conventional Parameters
O&G 127 38.0
pH (2) (2)
TSS 74.1 30.6
Metal Parameters
Antimony 0.249 0.206
Arsenic 0.162 0.104
Cadmium 0.0172 0.0102
Chromium 0.746 0.323
Cobalt 0.192 0.124
Copper 0.500 0.242
Lead 0.350 0.160
Mercury 0.00234 0.000739
Nickel 3.95 1.45
Silver 0.120 0.0351
Tin 0.409 0.120
Titanium 0.0947 0.0618
Vanadium 0.218 0.0662
Zinc 2.87 0.641
Organic Parameters
Bis(2-ethylhexyl) phthalate 0.215 0.101
Butylbenzyl phthalate 0.188 0.0887
Carbazole 0.598 0.276
n-Decane 0.948 0.437
Fluoranthene 0.0537 0.0268
n-Octadecane 0.589 0.302
1 mg/L (ppm).
2 Within the range 6 to 9.
(2) The following in-plant limitations apply to metal-bearing wastewater containing cyanide:
In-Plant Limitations
Regulatedparameter Maximum daily 1 Maximum monthly avg. 1
Cyanide 500 178
1 mg/L (ppm).
(d) Combined waste receipts from subparts A and C of this part. (1) As provided in § 437.42(a), any existing point source subject to this paragraph must achieve the following effluent limitations representing the application of BPT:
BPT Limitations
Regulatedparameter Maximum daily 1 Maximum monthly avg. 1
Conventional Parameters
BOD 5 163 53.0
O&G 205 50.2
pH (2) (2)
TSS 60.0 31.0
Metal Parameters
Antimony 0.249 0.206
Arsenic 0.162 0.104
Cadmium 0.474 0.0962
Chromium 15.5 3.07
Cobalt 0.192 0.124
Copper 0.865 0.757
Lead 1.32 0.283
Mercury 0.00234 0.000739
Nickel 3.95 1.45
Silver 0.120 0.0351
Tin 0.409 0.120
Titanium 0.0947 0.0618
Vanadium 0.218 0.0662
Zinc 0.497 0.420
Organic Parameters
Acetone 30.2 7.97
Acetophenone 0.114 0.0562
2-Butanone 4.81 1.85
o-Cresol 1.92 0.561
p-Cresol 0.698 0.205
Phenol 3.65 1.08
Pyridine 0.370 0.182
2,4,6-Trichlorophenol 0.155 0.106
1 mg/L (ppm).
2 Within the range 6 to 9.
(2) The following in-plant limitations apply to metal-bearing wastewater containing cyanide:
In-Plant Limitations
Regulatedparameter Maximum daily 1 Maximum monthly avg. 1
Cyanide 500 178
1 mg/L )ppm).
(e) Combined waste receipts from subparts B and C of this part. As provided in § 437.42(a), any existing point source subject to this paragraph must achieve the following effluent limitations representing the application of BPT:
BPT Limitations




Regulatedparameter Maximum daily 1 Maximum monthly avg. 1
Conventional Parameters
BOD5 163 53.0
O&G 127 38.0
pH (2) (2)
TSS 74.1 30.6
Metal Parameters
Arsenic 2.95 1.33
Cadmium 0.0172 0.0102
Chromium 0.746 0.323
Cobalt 56.4 18.8
Copper 0.500 0.242
Lead 0.350 0.160
Mercury 0.0172 0.00647
Tin 0.335 0.165
Zinc 0.497 0.420
Organic Parameters
Acetone 30.2 7.97
Acetophenone 0.114 0.0562
Bis(2-ethylhexyl) phthalate 0.215 0.101
2-Butanone 4.81 1.85
Butylbenzyl phthalate 0.188 0.0887
Carbazole 0.598 0.276
o-Cresol 1.92 0.561
p-Cresol 0.698 0.205
n-Decane 0.948 0.437
Fluoranthene 0.0537 0.0268
n-Octadecane 0.589 0.302
Phenol 3.65 1.08