Subchapter IV — Overflows and Sewage Collection Systems
NR 210.20 Permits for satellite sewage collection systems. NR 210.205 Combined sewer systems and overflows. NR 210.21 Sanitary sewer overflows and sewage treatment facility overflows. NR 210.22 Building Backups. NR 210.23 Capacity, Management, Operation, and Maintenance Programs. NR 210.24 System Evaluation and Capacity Assurance Plan. NR 210.25 Emergency Operation — Lift Stations. Ch. NR 210 NoteNote: Chapter NR 210 as it existed on October 31, 1986 was repealed and a new chapter NR 210 was created effective November 1, 1986. Corrections made under s. 13.93 (2m) (b) 7., Stats., Register, March, 1997, No. 495. Subchapter I — General
NR 210.01NR 210.01 Purpose. The purpose of this chapter is to establish effluent limitations, performance requirements and monitoring provisions to be used in permits for discharges from publicly owned treatment works and privately owned domestic sewage treatment works. NR 210.02NR 210.02 Applicability. This chapter applies to all publicly owned treatment works and privately owned domestic sewage treatment works. NR 210.02 HistoryHistory: Cr. Register, October, 1986, No. 370, eff. 11-1-86; CR 12-027: r. and recr. Register July 2013 No. 691, eff. 8-1-13. NR 210.03NR 210.03 Definitions. The definitions of terms and meanings of abbreviations used in this chapter are set forth in s. 283.01, Stats., chs. NR 205 and 218, and as follows: NR 210.03(1)(1) “7-day average” means the arithmetic mean of pollutant parameter values for samples collected in a period of 7 consecutive days. NR 210.03(2)(2) “30-day average” means the arithmetic mean of pollutant parameter values for samples collected in a period of 30 consecutive days. NR 210.03(2e)(2e) “Blending” means the routing of untreated or partially treated wastewater around a biological treatment process, or a portion of a biological treatment process, within a sewage treatment facility. The routing of untreated or partially treated wastewater around a portion of a biological treatment process is considered to be blending only if the entire wastewater flow has not received biological treatment. NR 210.03(2m)(2m) “Building backup” means an accumulation of sewage in any public or private building caused by blockage, failure, or other hydraulic constraint in the sewage collection system or by blockage or failure of the building sewer or private interceptor main sewer. NR 210.03 NoteNote: The discharge from a building sewer or private interceptor main sewer directly to a water of the state may be a sanitary sewer overflow and may be subject to the WPDES permit requirements of ch. 283, Stats. NR 210.03 NoteNote: Section NR 110.03 (6s) reads: “Building sewer” means that part of the drain system not within or under a building which conveys its discharge to a public sewer, private interceptor main sewer, private onsite wastewater treatment system, or other point of discharge or dispersal. NR 210.03(3)(3) “CBOD5” means the 5-day carbonaceous biochemical oxygen demand. NR 210.03(3h)(3h) “Combined sewer overflow” means a release of wastewater from a combined sewer system directly into a water of the state or to the land surface. NR 210.03(3p)(3p) “Combined sewer system” means a wastewater collection system owned by a municipality that conveys domestic, commercial, and industrial wastewater and storm water runoff through a single pipe system to a publicly owned treatment works. NR 210.03 NoteNote: Section NR 110.03 (7s) reads: “Combined sewer treatment facility” means all the structures, pipes, and other equipment that constitute the various treatment processes and treatment units employed to reduce pollutants in wastewater from combined sewer systems. NR 210.03(4)(4) “Disinfection” means the operation of an ultraviolet lamp unit, or the addition of chemical disinfectants with adequate mixing and detention times, to provide pathogen reductions. NR 210.03(5)(5) “Effluent concentrations consistently achievable through proper operation and maintenance” means: NR 210.03(5)(a)(a) For a given pollutant parameter, the 95th percentile value for the 30-day average effluent quality achieved by a treatment works in a period of at least 2 years, excluding values attributable to upsets, bypasses, operational errors, or other unusual conditions, and NR 210.03(5)(b)(b) A 7-day average value equal to 1.5 times the value derived under par. (a). NR 210.03(6)(6) “Facilities eligible for treatment equivalent to secondary treatment” means treatment works which meet all of the following: NR 210.03(6)(a)(a) The BOD5 and SS effluent concentrations consistently achievable through proper operation and maintenance of the treatment works exceed the minimum level of the effluent quality set forth in s. NR 210.05 (1) (a) and (b); NR 210.03(6)(b)(b) Trickling filters, aerated lagoons or waste stabilization ponds are used as the principal processes; and NR 210.03(6)(c)(c) The treatment works provide significant biological treatment of municipal wastewater. NR 210.03(6e)(6e) “Hydraulic constraint” means the structural collapse of a sewer, an accumulation of material in a sewer or an insufficiently-sized sewer such that sewage flow is impeded or stopped from flowing downstream. NR 210.03 NoteNote: Section NR 110.03 (16) reads: “Infiltration” means water other than wastewater that enters a sewerage system (including sewer service connections) from the ground through such sources as defective pipes, pipe joints, connections, or manholes. Infiltration does not include, and is distinguished from, inflow. NR 210.03 NoteNote: Section NR 110.03 (17) reads: “Inflow” means water other than wastewater that enters a sewerage system (including sewer service connections) from sources such as roof leaders, cellar drains, yard drains, area drains, foundation drains, sump pumps, drains from springs and swampy areas, manhole covers, cross connections between storm sewers and sanitary sewers, catch basins, cooling towers, storm waters, surface runoff, street wash waters, or drainage. Inflow does not include, and is distinguished from, infiltration. NR 210.03(8)(8) “Percent removal” means a percentage expression of the removal efficiency across a treatment plant for a given pollutant parameter, as determined from the 30-day average values of the raw wastewater influent pollutant concentrations to the facility and the 30-day average values of the effluent pollutant concentrations for a given time period. NR 210.03 NoteNote: Section NR 110.03 (26m) reads: “Private interceptor main sewer” means a sewer serving two or more buildings and not part of the municipal sewer system. NR 210.03(9)(9) “Privately owned domestic sewage treatment works” means those facilities which treat domestic wastewater and are owned and operated by nonmunicipal entities or enterprises such as mobile home parks, restaurants, hotels, motels, country clubs, resorts, etc., which are permitted under ch. 283, Stats. NR 210.03(10)(10) “Sanitary sewer overflow” means a release of wastewater from a sewage collection system or an interceptor sewer directly into a water of the state or to the land surface. NR 210.03(10m)(10m) “Sanitary survey” means a thorough investigation and evaluation of a surface water including bacteriological sampling to determine the extent and cause of any bacterial contamination. NR 210.03 NoteNote: Section NR 110.03 (28) reads: “Sewage collection system” means the common sanitary sewers, interceptor sewers, and appurtenant equipment, such as lift stations, within a sewerage system which are primarily installed to receive wastewaters directly from facilities which convey wastewater from individual structures or from private property, and which include service connection “Y” fittings designed for connection with those facilities. The facilities which convey wastewater from individual structures such as building sewers and private interceptor sewers, from private property to the public sanitary sewer, or its equivalent, are specifically excluded from the definition of “sewage collection system”; except that pumping units and pressurized lines for individual structures or groups of structures are included as part of a “sewage collection system” when such units are cost effective and are owned and maintained by the sewerage system owner. NR 210.03 NoteNote: Section NR 110.03 (29) reads: “Sewage treatment facility” means all the structures, pipes and other equipment that constitute the various treatment processes and treatment units employed to reduce pollutants in sewage. NR 210.03(13)(13) “Sewage treatment facility overflow” means a release of wastewater from a location within a sewage treatment facility, other than permitted effluent outfall structures, directly to a water of the state or to the land surface. A sewage treatment facility overflow does not include blending, controlled diversions or discharges from permitted combined sewage treatment facility effluent outfall structures. NR 210.03 NoteNote: Section NR 110.03 (29m) reads: “Sewer extension” means installation of a sewer or interceptor sewer, or extension thereof, to provide additional conveyance capacity and service to development within the existing or proposed tributary area of the extension. Alterations or modifications of existing sewerage systems designed to replace inadequate existing structures or installed because of inadequate hydraulic sewer capacity and that do not extend sanitary sewer service to areas previously not served are not sewer extensions. NR 210.03 NoteNote: Section NR 110.03 (30) reads: “Sewerage system” means all structures, conduits and pipes, by which sewage is collected, treated, and disposed of, except plumbing inside and in connection with buildings served, and service pipes, from building to street main. NR 210.03(16)(16) “Significant biological treatment” means the use of an aerobic or anaerobic biological treatment process in a treatment works to consistently achieve a 30-day average of at least 65% removal of BOD5. NR 210.03 HistoryHistory: Cr. Register, October, 1986, No. 370, eff. 11-1-86; CR 09-123: cr. (9m) Register July 2010 No. 655, eff. 8-1-10; CR 12-027: am. (intro.), cr. (2e), (2m), (2s), (3d), (3h), (3p), (3t), (6e), (6m), (6s), (8m), renum. (9m) to (12) and am., renum. (10) to (16), cr. (10), (11), (13) to (15) Register July 2013 No. 691, eff. 8-1-13; correction in (14) made under s. 13.92 (4) (b) 7., Stats., Register July 2013 No. 691; CR 19-014: (10m) renum. from NR 102.03 (6) Register April 2020 No. 772, eff. 5-1-20. Subchapter II — Monitoring Requirements and
Effluent Limitations
NR 210.035NR 210.035 Applicability. This subchapter applies to publicly owned treatment works and privately owned domestic sewage treatment works that discharge to surface waters. NR 210.035 HistoryHistory: CR 12-027: cr. Register July 2013 No. 691, eff. 8-1-13. NR 210.04(1)(1) Discharges subject to the provisions of this chapter shall at a minimum monitor the effluent for BOD5, SS, and pH. NR 210.04(2)(2) Influent wastewater strengths and volumes shall be characterized at treatment facilities subject to the monitoring provisions of sub. (1) by monitoring for flow, BOD5 and SS. NR 210.04(3)(3) Monitoring requirements may be adjusted on a case-by-case basis depending on wastewater characteristics and their potential to degrade water quality. NR 210.04(4)(4) The department shall require the use of 24-hour flow proportional samplers for monitoring influent and effluent wastewater quality except where the department determines through the permit issuance process that other sample types may adequately characterize the influent or effluent quality. In evaluating permit monitoring requirements, the department may consider: NR 210.04(4)(c)(c) Previous performance records as reported on the discharge monitoring report; NR 210.04(4)(d)(d) Type of wastewater treated: domestic, municipal or industrial wastewater; and NR 210.04 HistoryHistory: Cr. Register, October, 1986, No. 370, eff. 11-1-86. NR 210.05NR 210.05 Effluent limitations. Publicly owned treatment works and privately owned domestic sewage treatment works shall meet as a minimum the effluent limits specified in this section. NR 210.05(1)(c)(c) The effluent pH shall be within the range of 6.0 to 9.0. NR 210.05(1)(d)(d) Upon request by the permittee, pursuant to s. NR 210.07 (4), the department may substitute the parameter CBOD5 for the parameter BOD5 and the levels of effluent quality specified in par. (a). The following effluent quality levels of CBOD5 shall be applicable:
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