Statutes, codes, and regulations
Wisconsin Administrative Code
Agency - Department of Natural ResourcesEnvironmental Protection - Wisconsin Pollutant Discharge Elimination SystemChapter NR 260 - Electroplating
Subchapter II - Indirect Discharges
Section NR 260.22 - Discharge standards

Wis. Admin. Code Department of Natural Resources NR 260.22

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Current through October 28, 2024
Section NR 260.22 - Discharge standards
(1) Any existing source which introduces pollutants into a publicly owned treatment works shall comply with ch. NR 211 and achieve the following pretreatment standards for existing sources (PSES). The subcategories referred to in Tables 1 through 4 are those process subcategories listed in s. NR 260.02(1).
(a) No industrial user introducing wastewater pollutants into a publicly owned treatment works under the provisions of this chapter may augment the use of process wastewater or otherwise dilute the wastewater as a partial or total substitute for adequate treatment to achieve compliance with this standard.
(b) For facilities discharging less than 38,000 liters (10,000 gal.) per calendar day of electroplating process wastewater the following limitations shall apply:

Table 1

Facilities discharging less than 38,000 liters

per day PSES limitations (mg/l)

All subcategories

Pollutant or pollutant

1 day max.

4 day avg.2

30 day avg.3

property1

Cyanide, A

5.0

2.7

1.5

(CN, A)

Lead (Pb)

0.6

0.4

0.3

Cadmium (Cd)

1.2

0.7

.5

Total Toxic Organics (TTO)

4.57

1 All metals shall be determined in "total" form.

2 Average of daily values for 4 consecutive monitoring days.

3 Limitations for integrated facilities using the combined wastestream formula as set forth in s. NR 21 1.12.

(c) Except as provided in pars. (d) and (e), for facilities discharging 38,000 liters (10,000 gal.) or more per calendar day of electroplating process wastewater the following limitations shall apply:

Table 2

Facilities discharging 38,000 liters or more

per day PSES limitations (mg/l)

All subcategories

Pollutant or pollutant property1

1 day max.

4 day avg.2

30 day avg.3

Silver (Ag)4

1.2

0.7

.5

Cyanide (CN)

1.9

1.0

.55

Copper (Cu)

4.5

2.7

1.8

Nickel (Ni)

4.1

2.6

1.8

Chromium (Cr)

7.0

4.0

2.5

Zinc (Zn)

4.2

2.6

1.8

Lead (Pb)

0.6

0.4

0.3

Cadmium (Cd)

1.2

0.7

.5

Total Metals5

10.5

6.8

5.0

Total Toxic

Organics

(TTO)

2.13

1 All metals and cyanide shall be determined in ''total" form.

2 Average of daily values for 4 consecutive monitoring days.

3 Limitations for integrated facilities using the combined wastestream formula as set forth in s. NR 21 1.12.

4 Applicable to subcategory (b) only - Electroplating of precious metals.

5 Total Metals equals the sum of the concentrations of copper, nickel, chro - mium and zinc.

(d) The following optional mass based limitations are equivalent to and may apply in place of those outlined in Table 2 if there has been a prior agreement between the facility and the publicly owned treatment works receiving such regulated wastes:

Table 3

Optional Mass Limits

Facilities discharging 38,000 liters or more

per day PSES limitations (mg/sq m - operation1)

Subcategories (a) to (g)

Subcategory (h)

Pollutant or

pollutant

property2

1 day max.

4 day

avg.3

30 day

avg.4

1day max.

4 day avg.3

30 day

avg.4

Silver (Ag)5

47

29

20

Cyanide

(CN)

74

39

21

169

89

49

Copper (Cu)

176

105

70

401

241

160

Nickel (Ni)

160

100

70

365

229

160

Chromium

(Cr)

273

156

96

623

357

223

Zinc (Zn)

164

102

70

374

232

160

Lead (Pb)

23

16

13

53

36

27

Cadmium

(Cd)

47

29

20

107

65

45

Total Metals6

410

267

195

935

609

445

Total Toxic Organics

(TTO)7

2.13

2.13

1 The area plated or acted upon by the processes described in ss. NR 260.02(1) and 260.03(3) which are expressed in square meters.

2 All metals and cyanide shall be determined in ' 'total" form.

3 Average of daily values for 4 consecutive monitoring days.

4 Limitations for integrated facilities using the combined wastestream formula as set forth in s. NR 21 1.12.

5 Applicable to subcategory (b) only - Electroplating of precious metals.

6 Total Metals equals the sum of the masses of copper, nickel, chromium and zinc.

7 TTO shall be measured by mg/l.

(e) In the absence of strong chelating agents, after reduction of hexavalent chromium wastes, and after neutralization using calcium oxide (or hydroxide), the following control program may be elected by the industrial user, with the approval of the control authority, in place of the limitations in Table 2. These optional pollutant limitations are not eligible for allowance for removal achieved by the publicly owned treatment works.

Table 4

Optional Control Program Limits1

Facilities discharging 38,000 liters or more

per day PSES limitations (mg/l)

All subcategories

Pollutant or pollutant

1 day max.

4 day avg.3

30 day avg.4

property2

Cyanide (CN)

1.9

1.0

.55

Lead (Pb)

0.6

0.4

0.3

Cadmium (Cd)

1.2

0.7

.5

Total Suspended Solids (TSS)

20.0

13.4

10.0

pH5

7.5 - 10.0

7.5 - 10.0

Total Toxic

Organics

(TTO)

2.13

1 Optional pollutants agreed upon by facility and control authority.

2 All metals and cyanide shall be determined in ''total" form.

3 A verage of daily values for 4 consecutive monitoring days.

4 Limitations for integrated facilities using the combined wastestream formula as set forth in s. NR 21 1.12.

5 pH shall be measured in standard units.

(2) Where electroplating process wastewaters are combined with regulated wastewaters which have 30-day average standards, the corresponding 30-day average standard for the electroplating wastewaters shall be used. The 30-day average for pollutants may be found in Tables 1 through 4.

Wis. Admin. Code Department of Natural Resources NR 260.22

Cr. Register, October, 1986, No. 370, eff. 11-1-86.