NR 211.10(2)(f)(f) Petroleum oil, nonbiodegradable cutting oil or products of mineral oil origin in amounts that will cause interference or pass through.

NR 211.10(2)(g)(g) Pollutants which result in the presence of gases, vapors or fumes within the POTW in a quantity which may cause acute worker health or safety problems.

NR 211.10(3)(a)(a) POTWs developing pretreatment programs under subchapter II shall develop specific prohibited discharge standards to enforce the general prohibitions of subs. (1) and (2). All other POTWs shall, where the contributions of industrial users result in pass-through or interference and the resulting permit violation is likely to recur, develop and enforce specific prohibited discharge standards which, together with appropriate POTW facility or operation changes, are necessary to ensure continued compliance with the POTW’s WPDES permit.

NR 211.10(3)(c)(c) Specific prohibited discharge standards may not be developed and enforced by the POTW without giving prior notice to persons or groups who have requested notice and an opportunity to respond.

NR 211.10(3)(d)(d) Where specific prohibited discharge standards or limits on pollutants or pollutant parameters are developed by a POTW under this subsection, they shall be deemed pretreatment standards for the purposes of s. 283.21 (2), Stats.

NR 211.10(3)(e)(e) POTWs may develop best management practices to implement the prohibitions of subs. (1) and (2). Such BMPs shall be considered specific prohibited discharge standards under this subsection and pretreatment standards for the purposes of s. 283.21 (2), Stats.

NR 211.10(4)(4) Except where expressly authorized to do so by an applicable pretreatment standard or requirement, no industrial user may increase the use of process water or in any other way attempt to dilute a discharge as a partial or complete substitute for adequate treatment to achieve compliance with a pretreatment standard or requirement. The control authority may impose mass limitations on an industrial user to account for dilution or in any other situation for which the control authority finds mass limitations appropriate.

NR 211.10 HistoryHistory: Cr. Register, July, 1983, No. 331, eff. 8-1-83; r. (1) (a) and (b), am. (2) (a), cr. (2) (f) to (h) and (4), Register, March, 1992, No. 435, eff. 4-1-92; correction in (2) (a) made under s. 13.92 (4) (b) 7., Stats., Register May 2011 No. 665; CR 13-006: am. (3) (d), cr. (3) (e) Register January 2014 No. 697, eff. 2-1-14; CR 19-082: am. (2) (a) Register July 2020 No. 775, eff. 8-1-20.

NR 211.11(1)(1) Categorical pretreatment standards for specific point source categories are set forth in chs. NR 221 to 297. Limits in categorical pretreatment standards shall apply to the effluent from the process regulated by the standard, unless otherwise specified in the standard. Limits in categorical pretreatment standards shall apply to wastestreams which are transported off-site for disposal as well as those discharged on-site. Industrial users shall comply with applicable categorical pretreatment standards, in addition to complying with the general prohibitions established in s. NR 211.10, unless specifically noted otherwise in the categorical pretreatment standard.

NR 211.11(2)(2) Compliance dates.

NR 211.11(2)(a)(a) All industrial users, except new sources, shall comply with the applicable categorical pretreatment standards within 3 years from the effective date of the standard or within a shorter time period if specified in the applicable standard. A direct discharger which becomes an industrial user after promulgation of an applicable categorical pretreatment standard may not be considered a new source unless it falls within the definition of a “new source”contained in s. NR 211.03 (9).

NR 211.11(2)(b)(b) New sources shall install, have in operating condition and start up all of the pollution control equipment required to meet the applicable pretreatment standards before beginning discharge. Within the shortest feasible time, not to exceed 90 days, new sources shall meet all applicable pretreatment standards.

NR 211.11(3)(3) Conversion to equivalent mass or concentration standards.

NR 211.11(3)(a)1.1. When the limits in a categorical pretreatment standard are expressed only in terms of mass of pollutant per unit of production, the control authority may convert the limits to equivalent limitations expressed either as mass of pollutant discharged per day or effluent concentration for purposes of calculating limits for individual users.

NR 211.11(3)(a)2.2. Equivalent mass per day limits shall be calculated by multiplying the limits in the standard by the industrial user’s average rate of production. This average rate of production shall be based upon a reasonable measure of the industrial user’s actual long-term daily production, such as average daily production, during a representative year. For new sources, actual production shall be estimated using projected production.

NR 211.11(3)(a)3.3. Equivalent concentration limits shall be calculated by dividing the mass limits derived according to subd. 2. by the average daily flow rate of the industrial user’s process wastewater. This average daily flow rate shall be based upon a reasonable measure of the industrial user’s actual long-term average flow rate, such as the average daily flow rate during the same representative year used in subd. 2.

NR 211.11(3)(a)4.4. When pretreatment standards specify both daily and long-term limits, the same production or flow figures shall be used in calculating daily and long-term equivalent limits.

NR 211.11(3)(a)5.5. Any industrial user operating under a control mechanism incorporating equivalent mass or concentration limits calculated from a production based standard shall notify the control authority within 2 business days after the industrial user has reason to know that the production level will significantly change within the next calendar month. Any industrial user which does not notify the control authority of such anticipated change shall meet the mass or concentration limits in its control mechanism that were based on the original estimate of the long-term average production rate.

NR 211.11(3)(bm)1.1. When the limits in a categorical pretreatment standard are expressed only in terms of pollutant concentrations, an industrial user may request that the control authority convert the limits to equivalent mass limits. The determination to convert concentration limits to mass limits is within the discretion of the control authority. The control authority may establish equivalent mass limits only if the industrial user:

NR 211.11(3)(bm)1.a.a. Employs or demonstrates that it will employ water conservation methods and technologies that substantially reduce water use during the term of its control mechanism;

NR 211.11(3)(bm)1.b.b. Uses control and treatment technologies that are adequate to achieve compliance with the applicable categorical pretreatment standard, and has not used dilution as a substitute for treatment;

NR 211.11(3)(bm)1.c.c. Provides sufficient information to establish the facility’s actual average daily flow rate for all waste streams, based on data from a continuous effluent flow monitoring device, as well as the facility’s long-term average production rate. Both the actual average daily flow rate and the long-term average production rate shall be representative of current operating conditions;

NR 211.11(3)(bm)1.d.d. Does not have daily flow rates, production levels, or pollutant levels that vary so significantly that equivalent mass limits are not appropriate to control the discharge; and