Chapter NR 206

Chapter NR 206

LAND DISPOSAL OF MUNICIPAL AND DOMESTIC WASTEWATERS

NR 206.01   Purpose.

NR 206.02   Applicability.

NR 206.03   Definitions.

NR 206.05   Compliance with effluent limitations and monitoring requirements.

NR 206.06   Alternative requirements.

NR 206.07   General conditions required for all land disposal systems.

NR 206.08   Effluent limitations for specific types of land disposal systems.

NR 206.09   Wastewater monitoring requirements.

NR 206.10   Groundwater monitoring.

Ch. NR 206 Note Note: Corrections made under s. 13.93 (2m) (b) 7., Stats., Register, March, 1997, No. 495.

NR 206.01 NR 206.01 Purpose. The purpose of this chapter is to establish effluent limitations and monitoring requirements to be used in permits for discharges of wastewaters from publicly owned treatment works and privately owned domestic wastewater treatment works to land disposal systems. Section 283.31, Stats., requires a permit for the lawful discharge of any pollutant into the waters of the state. Section 283.01 (13), Stats., defines “waters of the state” as including groundwater. Consequently, permits are required for the type of discharges to which this chapter applies. It is the intent of the department through this chapter to restore and maintain the physical, chemical and biological integrity of the groundwater of the state and to encourage the protection of this resource, and to achieve compliance with ch. NR 140.

NR 206.01 History History: Cr. Register, March, 1985, No. 351, eff. 4-1-85; am. Register, November, 1990, No. 419, eff. 12-1-90; correction made under s. 13.93 (2m) (b) 7., Stats., Register, January, 2000, No. 529.

NR 206.02 NR 206.02 Applicability.

NR 206.02(1) (1) The provisions of this chapter are applicable to discharges to land disposal systems of liquid wastewaters from publicly owned wastewater treatment works and from privately owned domestic wastewater treatment works;

NR 206.02(2) (2) The provisions of this chapter are not applicable to land disposal of:

NR 206.02(2)(a) (a) Industrial wastes and by-products approved and permitted under ch. NR 214;

NR 206.02(2)(b) (b) Sludge from publicly owned wastewater treatment works and privately owned domestic wastewater treatment works regulated under ch. NR 204;

NR 206.02(2)(c) (c) Domestic wastewater by “private pumpers” as defined and regulated under ch. NR 113;

NR 206.02(2)(d) (d) Septage disposal regulated under ch. NR 113; and

NR 206.02(2)(e) (e) Solid, liquid, and hazardous wastes at a disposal site licensed pursuant to chs. NR 500 to 520 or 660 to 670.

NR 206.02 History History: Cr. Register, March, 1985, No. 351, eff. 4-1-85; am. (1), r. (2) (d), renum. (2) (e) and (f) to be (2) (d) and (e), and am. (e), Register, 1990, November, No. 419, eff. 12-1-90; correction in (2) (e) made under s. 13.92 (4) (b) 7., Stats., Register May 2011 No. 665.

NR 206.03 NR 206.03 Definitions. The following definitions are applicable to terms used in this chapter. Definitions of other terms and the meanings of abbreviations are set forth in ch. NR 205.

NR 206.03(1) (1) “Average daily flow” means the average daily wastewater volume discharging to the wastewater treatment system determined for the previous 24 months.

NR 206.03(2) (2) “Average design flow” means the anticipated average daily wastewater discharge to a sewage treatment facility.

NR 206.03(3) (3) “Bedrock” means the rocks that underlie soil material. Bedrock may be present at the earth’s surface when the weathered in place consolidated material, larger than 2 mm in size, is greater than 50% by volume.

NR 206.03(4) (4) “Biological treatment” means a level of wastewater treatment accomplished through:

NR 206.03(4)(a) (a) An activated sludge process,

NR 206.03(4)(b) (b) Trickling filters,

NR 206.03(4)(c) (c) An aerated lagoon,

NR 206.03(4)(d) (d) Rotating biological contactors,

NR 206.03(4)(e) (e) A stabilization pond, or

NR 206.03(4)(f) (f) Other equivalent systems approved on a case-by-case basis.

NR 206.03(5) (5) “Cation exchange capacity” means the sum total of exchangeable cations absorbed by a soil, expressed in milliequivalents per 100 grams of oven dry soil.

NR 206.03(7) (7) “Domestic wastewater” means the type of wastewater normally discharged from plumbing facilities in private dwellings or commercial domestic establishments and includes, but is not limited to, sanitary, bath, laundry, dishwashing, garbage disposal and cleaning wastes.

NR 206.03(8) (8) “Groundwater” means any of the waters of the state as defined in s. 299.01 (5), Stats., occurring in a saturated subsurface geological formation of rock or soil.

NR 206.03(9) (9) “Groundwater monitoring” means measuring the groundwater level and/or analyzing samples of water taken from one or more wells.

NR 206.03(10) (10) “Hazardous waste” means a waste identified by the department as hazardous under s. 299.01 (6), Stats.

NR 206.03(11) (11) “Highest anticipated groundwater elevation” means the sum of the calculated mounding effects of the disposal discharge and the seasonal high groundwater level.

NR 206.03(12) (12) “High groundwater level” means the higher of either the elevation to which the soil is saturated as observed as a free water surface in an unlined hole, or the elevation to which the soil has been seasonally or periodically saturated as indicated by soil color pattern throughout the soil profile.

NR 206.03(13) (13) “Hydraulic application rate” means the average daily volume of effluent discharged to a designated acreage of land of the land application system during a calendar month or other period of time specified in a WPDES permit. The rate is calculated by dividing the total discharge volume for the month or period of time by the acreage of land and by the number of days in the month or period of time (usually expressed in units of gpad). For overland flow systems, the hydraulic application rate is expressed as flow rate per unit width of slope.

NR 206.03(14) (14) “Hydraulic loading rate” means the average daily volume of effluent discharged to a land disposal system during a calendar month or other period of time specified in a WPDES permit for the discharge. The average is calculated by dividing the total discharge volume for the month or period of time by the number of days in the month or period of time.

NR 206.03(15) (15) “Injection” means the subsurface emplacement of a fluid or waste.

NR 206.03(16) (16) “Land disposal system” means a facility for disposing of liquid wastes consisting of:

NR 206.03(16)(a) (a) An absorption or seepage pond system,

NR 206.03(16)(b) (b) A ridge and furrow system,

NR 206.03(16)(c) (c) A spray irrigation system,

NR 206.03(16)(d) (d) A subsurface soil absorption system or mound system,

NR 206.03(16)(e) (e) An overland flow system, or

NR 206.03(16)(f) (f) Any other land area receiving liquid waste discharges.

NR 206.03(17) (17) “Large scale soil absorption system” means a private sewage system or subsurface soil absorption system which has a design capacity of more than 12,000 gallons per day where design capacity is calculated in accordance with s. NR 200.03 (4).

NR 206.03(18) (18) “Privately owned domestic wastewater treatment work” means facilities which treat domestic wastewater and which are owned and operated by non-municipal entities or enterprises such as mobile home parks, restaurants, hotels, motels, country clubs, etc., which are permitted under ch. 283, Stats.

NR 206.03(19) (19) “Publicly owned treatment work” has the meaning specified under s. NR 211.03 (8).

NR 206.03(20) (20) “Soil” means the unconsolidated material which overlies the bedrock.

NR 206.03(21) (21) “Total Kjeldahl nitrogen” or “TKN” means the sum of ammonia nitrogen and organic nitrogen.

NR 206.03(22) (22) “Total nitrogen” means the sum of nitrate plus nitrite nitrogen, ammonia nitrogen, and organic nitrogen.

NR 206.03(23) (23) “Toxic pollutants” has the meaning specified under s. NR 205.03 (7).

NR 206.03(24) (24) “Water table observation well” means any groundwater monitoring well whose screen intersects the water table, installed for the specific purpose of determining either the elevation of the water table or the physical, chemical, biological or radiological properties of groundwater at the water table or both.

NR 206.03(25) (25) “WPDES permit” means a permit issued under the Wisconsin pollutant discharge elimination system.

NR 206.03(26) (26) “Well” means any borehole or other excavation or opening in the ground deeper than it is wide constructed for the purpose of obtaining or monitoring groundwater.

NR 206.03 History History: Cr. Register, March, 1985, No. 351, eff. 4-1-85; r. (7), (12) and (17), renum. (1) to (6), (8) to (11) and (13) to (16) to be (3), (4), (7) to (10), (14) to (16), (18) to (20), (23) and (25) and am. (16), cr. (1), (2), (5), (6), (11) to (13), (17), (21), (22), (24) and (26), Register, November, 1990, No. 419, eff. 12-1-90; r. and recr. (17), Register, January, 2000, No. 529, eff. 2-1-00.

NR 206.05 NR 206.05 Compliance with effluent limitations and monitoring requirements.

NR 206.05(1) (1) All new or modified land disposal systems approved on or after December 1, 1990 shall comply with the applicable effluent limits and monitoring requirements of this chapter and groundwater quality standards in ch. NR 140.

NR 206.05(2) (2) All land disposal systems, except large scale soil absorption systems, approved or modified prior to December 1, 1990 shall comply with the effluent limits as shown in Table 1, and with the groundwater quality standards in ch. NR 140.

NR 206.05(3) (3) All land disposal systems, except large scale soil absorption systems, approved prior to December 1, 1990 shall comply with the monitoring requirements described in s. NR 206.09 by January 1, 1994.

NR 206.05(4) (4) Large scale soil absorption systems shall comply with the effluent monitoring requirements of this chapter and with the groundwater quality standards in ch. NR 140. Influent monitoring may be required on a case-by-case basis.

NR 206.05(5) (5) All systems, except large scale soil absorption systems, approved prior to December 1, 1990 shall comply with the effluent limits for BOD5 and load/rest requirements described in ss. NR 206.08 (1) (b) 1., (2) (b) 3., (3) (b) 3., and 110.25 (4) (f).

NR 206.05(6) (6) All systems for which groundwater monitoring is required under s. NR 206.10 shall comply with the groundwater monitoring construction requirements of s. NR 110.25 and ch. NR 141.

NR 206.05 History History: Cr. Register, March, 1985, No. 351, eff. 4-1-85; r. and recr. Register, November, 1990, No. 419, eff. 12-1-90.

NR 206.06 NR 206.06 Alternative requirements.

NR 206.06(1) (1) If the owner of a proposed land disposal system feels that compliance with the monitoring requirements, discharge prohibitions and effluent limits of this chapter are impracticable, the reasons therefore shall be fully communicated in writing to the department. This communication shall set forth alternative requirements for which department approval is sought and all pertinent facts, data, reports, and studies supporting the imposition of such alternative requirements, along with supporting documentation on the ability of the system to meet ch. NR 140 standards or standards pursuant to the appropriate variances.

NR 206.06(2) (2) If the department determines that compliance with the monitoring requirements, discharge prohibitions and effluent limits of this chapter would be impracticable in specific cases, it may approve alternative requirements which, in its opinion, are in substantial compliance with the requirements of this chapter and ch. NR 140.

NR 206.06 History History: Cr. Register, March, 1985, No. 351, eff. 4-1-85; am. Register, November, 1990, No. 419, eff. 12-1-90.

NR 206.07 NR 206.07 General conditions required for all land disposal systems.

NR 206.07(1) (1) Design limitations.

NR 206.07(1)(a) (a) A land disposal system shall be constructed in accordance with the design criteria in ch. NR 110, or the appropriate rules promulgated by the department of safety and professional services for large scale subsurface soil absorption systems.

NR 206.07(1)(b) (b) Background groundwater monitoring data described in ss. NR 140.20 (1) and 206.10 (4) shall be collected prior to the design of a land disposal system, and submitted to the department as part of the facility plan required in s. NR 110.09.