Chapter NR 260

NR 260.03(3)(f) (f) “Chemical etching and milling” means any step in the process of etching or milling of ferrous or nonferrous material in which metal is chemically or electrochemically removed from the work piece and is followed by a rinse; this includes the related metal cleaning operations which precede chemical etching or milling.

NR 260.03(3)(g) (g) “Electroless plating” means any step in a process in which a metallic layer is deposited on a metallic or nonmetallic basis material and which is followed by a rinse; this includes the related operations of alkaline cleaning, acid pickling and stripping.

NR 260.03(3)(h) (h) “Printed circuit manufacturing” means any step in the process of converting an insulating substrate to a finished printed circuit board in which the board is immersed in an aqueous process bath which is followed by a rinse.

NR 260.03(4) (4) “Integrated facility” means a facility where manufacturing of a product at a single physical location includes electroplating as only one of several operations and produces significant quantities of process wastewater from nonelectroplating manufacturing operations and in which one or more plant electroplating process wastewater lines are combined prior to or at the point of treatment (or proposed treatment) with one or more plant sewers carrying nonelectroplating process wastewater.

NR 260.03(5) (5) “New source” means any building, structure, facility or installation from which there is or may be a discharge of pollutants, the construction of which commenced after August 31, 1982.

NR 260.03(6) (6) “Strong chelating agents” means compounds which form soluble metal complexes which are not removed by subsequent metals control techniques such as pH adjustment followed by clarification or filtration.

NR 260.03(7) (7) “TTO” means total toxic organics, which is the sum of all quantifiable values greater than 0.01 milligrams per liter (10 micrograms per liter) of the toxic organics listed in s. NR 215.03 (1) to (5).

NR 260.03 History History: Cr. Register, October, 1986, No. 370, eff. 11-1-86; correction in (7) made under s. 13.92 (4) (b) 7., Stats., Register February 2021 No. 782.

subch. I of ch. NR 260 Subchapter I — Direct Discharges

NR 260.10 NR 260.10 Applicability. All facilities which generate wastewater from any of the processes listed in s. NR 260.02 (1) discharging directly to waters of the state are subject to the provisions of ch. NR 261.

NR 260.10 History History: Cr. Register, October, 1986, No. 370, eff. 11-1-86.

subch. II of ch. NR 260 Subchapter II — Indirect Discharges

NR 260.20 NR 260.20 Applicability. All indirect discharges of wastewater generated from any of the processes listed in s. NR 260.02 (1) except those subject to pretreatment standards for new sources included under ch. NR 261, are subject to the provisions of this subchapter. All captive facilities are regulated under ch. NR 261, as of February 15, 1986, and the provisions of this chapter no longer apply.

NR 260.20 History History: Cr. Register, October, 1986, No. 370, eff. 11-1-86.

NR 260.21 NR 260.21 Compliance dates. Industrial users subject to the provisions of this subchapter shall meet the following compliance dates:

NR 260.21(1) (1) By April 27, 1984, for all facilities which are not integrated facilities and are subject to pretreatment standards for existing sources.

NR 260.21(2) (2) By June 30, 1984, for all integrated facilities subject to pretreatment standards for existing sources.

NR 260.21(3) (3) By July 15, 1986, for all industrial users subject to TTO limitations.

NR 260.21 History History: Cr. Register, October, 1986, No. 370, eff. 11-1-86.

NR 260.22 NR 260.22 Discharge standards.

NR 260.22(1) (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).

NR 260.22(1)(a) (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.

NR 260.22(1)(b) (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

- See PDF for table

NR 260.22(1)(c) (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

- See PDF for table

NR 260.22(1)(d) (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)

- See PDF for table

- See PDF for table

NR 260.22(1)(e) (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

- See PDF for table

NR 260.22(2) (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.

NR 260.22 History History: Cr. Register, October, 1986, No. 370, eff. 11-1-86.

NR 260.23 NR 260.23 Total toxic organics monitoring requirements.

NR 260.23(1) (1) In place of monitoring for TTO, the control authority may allow industrial users of publicly owned treatment works to make the following certification to replace the periodic reports required by s. NR 211.15:

“Based on my inquiry of the person or persons directly responsible for managing compliance with the pretreatment standard for total toxic organics (TTO), I certify that, to the best of my knowledge and belief, no dumping of concentrated toxic organics into the wastewaters has occurred since filing the last discharge monitoring report. I further certify that this facility is implementing the toxic organic plan submitted to the control authority.”

NR 260.23(2) (2) Industrial users of publicly owned treatment works shall submit a toxic organic management plan when requesting that monitoring not be required. The plan shall specify the toxic organic compounds used; the method of disposal used instead of dumping, such as reclamation, contract hauling, or incineration; and procedures for assuring that toxic organics do not routinely spill or leak into the wastewater.

NR 260.23(3) (3) An existing source submitting a certification in lieu of monitoring pursuant to subs. (1) and (2) shall implement the toxic organic management plan approved by the control authority.

NR 260.23(4) (4) If monitoring is necessary to measure compliance with the TTO standard, the industrial user need analyze only for those pollutants reasonably expected to be present.

NR 260.23 History History: Cr. Register, October, 1986, No. 370, eff. 11-1-86.