Register September 2021 No. 789
Chapter NR 113
SERVICING SEPTIC OR HOLDING TANKS, PUMPING CHAMBERS, GREASE INTERCEPTORS, SEEPAGE BEDS, SEEPAGE PITS, SEEPAGE TRENCHES, PRIVIES, OR PORTABLE RESTROOMS
Vehicle inspections and servicing.
Disposal of septage.
Site and soil evaluations.
Septage storage facilities.
Suspension and revocation.
Ch. NR 113 Note
Chapter NR 113 as it existed on September 30, 1987 was repealed and a new chapter NR 113 was created effective October 1, 1987. Chapter NR 113 as it existed on December 31, 1996, was repealed and a new chapter NR 113 was created effective January 1, 1997; corrections made under s. 13.93 (2m) (b) 7., Stats., Register, January, 1999, No. 517
NR 113.01 Purpose.
The purposes of this chapter are to establish standards for the servicing of private sewage systems including septic and holding tanks, dosing chambers, grease interceptors, seepage beds, seepage pits, seepage trenches, distribution cells, privies, and portable restrooms; to provide for the use and disposal of wastewaters from these sources while protecting public health from unsanitary and unhealthful practices and conditions; and to protect surface waters and groundwaters of the state from contamination by septage. The beneficial use of septage and its recycling to the land as a fertilizer or soil conditioner is encouraged.
NR 113.02 Applicability.
This chapter applies to licensed haulers, certified operators, owners, and any person servicing private sewerage systems including septic and holding tanks, dosing chambers, grease interceptors, seepage beds, seepage pits, seepage trenches, distribution cells, privies, and portable restrooms. The following services are exempt from these rules:
The transport of animal excrement and associated bedding.
The use or disposal of septage that has been treated by facilities which are operated under a Wisconsin pollutant discharge elimination system (WPDES) discharge permit, including centralized septage treatment facilities, which are regulated under ch. NR 204
NR 113.02 History
Cr. Register, September, 1996, No. 489
, eff. 1-1-97; corrections in (3) and (4) made under s. 13.92 (4) (b) 7.
, Stats., Register February 2010 No. 650
; CR 20-046: am. (intro.) Register September 2021 No. 789, eff. 10-1-21.
NR 113.03 Definitions.
In addition to the definitions and abbreviations in s. 281.48
, Stats., the following definitions apply to terms used in this chapter:
“Agricultural land" means land on which a food crop, a feed crop, or fiber crop will be grown within 12 months after septage is applied to the land. This includes range land and land used as pasture.
“Agronomic rate" means the total septage application rate (dry weight basis) designed to provide the amount of nitrogen needed by the food crop, feed crop, fiber crop, cover crop, or other vegetation grown on the land and designed to minimize the amount of nitrogen in the septage that passes below the root zone of the crop or vegetation grown on the land to the ground water.
“Application rate" means the hydraulic loading limits placed on a landspreading site or field normally expressed as gallons/acre/week.
“Approved site" means property approved by the department or its agent for the disposal, recycling or storage of septage.
“Available nitrogen" means the nitrogen present in the septage in the NH3
-N form and the nitrogen that is mineralized from the organic nitrogen in the septage, both of which can then be absorbed and assimilated by growing plants in the cropping year.
“Available water capacity" means the amount of water which is readily held by the soil and available for plant uptake. Available water holding capacity shall be calculated using the following table or other method acceptable to the department:
- See PDF for table
- See PDF for table
“Bedrock” means the rock that is exposed at the earth's surface or underlies soil material and includes any of the following:
Weathered in-place consolidated material, larger than 2 mm in size and greater than 50 percent by volume.
Weakly consolidated sandstone at the point of increased resistance to penetration of a knife blade.
“Business" means any individual, partnership, corporation, or body politic that does servicing.
“Centralized septage treatment facility” means a treatment facility that accepts septage from multiple sources and treats the septage prior to discharge or disposal.
NR 113.03 Note
Centralized septage treatment facilities are regulated under ch. NR 204
“Certified operator” means any person servicing private sewage systems such as septic and holding tanks, dosing chambers, grease interceptors, seepage beds, seepage pits, seepage trenches, distribution cells, privies, or portable restrooms who holds a valid Wisconsin septage servicing operator's certification under ch. NR 114
“Community well" means a public well which serves at least 15 service connections used by year-round residents or regularly serves at least 25 year-round residents. Any public well serving 7 or more homes, 10 or more mobile homes, 10 or more apartment units, or 10 or more condominium units shall be considered a community well unless information is available to indicate that 25 year-round residents will not be served.
“Department" means the department of natural resources.
“Disposal" means the controlled discharge of septage to a POTW, treatment or storage lagoon, or to an agricultural field for the purpose of recycling nutrients back into the environment.
“Distribution cell” means a dimensional zone that is part of a POWTS treatment or dispersal component where wastewater is disseminated into in situ soil or engineered soil.
“Dormant field" means a field that is not currently used or will not be used within 12 months after septage has been applied to the field for the harvesting of a crop. A field may have a vegetative cover crop grown on it, and a need for increased organic matter.
“Dosing chamber” or “pumping chamber” means a water tight receptacle that employs a pump or automatic siphon to elevate or distribute effluent to the private sewage system.
“Dry run" means a drainage pathway, either natural or artificial, with definable banks, which contains a confined flow during periods of runoff.
“DSPS” means the department of safety and professional services.
“Farmer" means a person who owns or leases a contiguous parcel of land of 40 acres or more that the person is using for agricultural purposes.
“Food crops" means tobacco and crops grown for human consumption.
“Grease interceptor" means a water tight receptacle designed to intercept and retain grease or fatty substances contained in kitchen and other food wastes. Grease interceptor and grease trap mean the same thing.
“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 permeable rock or soil.
“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 patterns throughout the soil profile.
“High use field” means a field that is approved by the department to receive more than 39,000 gallons per acre of septage per crop year and the volume applied is limited to the crop nutrient requirements.