SPS 382.32(3)(a)
(a) Trap exceptions. The plumbing fixtures listed in subds.
1. to
3. shall not be required to be separately trapped:
SPS 382.32(3)(a)2.
2. Compartments of a combination plumbing fixture installed on one trap, provided:
SPS 382.32(3)(a)2.b.
b. The distance between the compartments' waste outlets farthest apart does not exceed 30"; and
SPS 382.32(3)(b)
(b) Trap seals. Each trap shall provide a liquid seal depth of not less than 2" and not more than 4", except as otherwise specified in this chapter.
SPS 382.32(3)(c)
(c) Loss of trap seal. A trap seal primer valve may be installed on a trap subject to high rates of evaporation.
SPS 382.32(3)(c)1.
1. A trap seal primer valve or other means of trap seal protection acceptable to the department shall be provided for a trap subject to seal loss due to evaporation.
SPS 382.32 Note
Note: Liquids acceptable to use for reducing trap seal evaporation include mineral oil, vegetable oil, propylene glycol and glycerin.
SPS 382.32 Note
Note: A list of referenced standards is contained in ch.
SPS 381.
SPS 382.32(3)(c)3.
3. Barrier type trap seal protectors for floor drains shall conform to ASSE 1072.
SPS 382.32(3)(d)
(d) Design. Traps shall be self-scouring and shall not have interior partitions, except where such traps are integral with the fixture. Uniform diameter P-traps shall be considered self-scouring.
SPS 382.32(3)(e)1.1. Except as provided in subd.
2., traps shall be of diameters not less than those specified in Table 382.30-1.
SPS 382.32(3)(e)2.
2. The minimum trap diameter for a trap serving a shower replacing a non-public residential-type bathtub is 1.5 inches provided each of the following apply:
SPS 382.32(3)(e)2.a.
a. The shower shall have no more than one control valve and not allow for the operation of more than one showerhead simultaneously.
SPS 382.32(3)(e)2.b.
b. It shall be permissible under this approval to use a diverter valve that feeds up to 2 showerheads provided the showerheads cannot be used simultaneously.
SPS 382.32(3)(f)
(f) Prohibited traps. The installation of the types of traps listed in subds.
1. to
6. shall be prohibited:
SPS 382.32(3)(f)4.
4. Separate fixture traps which depend on interior partitions for the trap seal;
SPS 382.32(4)(a)(a) Setting of traps. All traps shall be rigidly supported and set true with respect to the water level and so located as to protect the water seals, and shall be protected from freezing and evaporation.
SPS 382.32(4)(b)1.1. `Vertical distance.' Except as provided in subd.
1. a. to
c., the vertical distance between the top of the fixture drain outlet and the horizontal center line of the trap outlet shall not exceed 15".
SPS 382.32(4)(b)1.a.
a. The vertical distance between the top of the strainer of a floor drain or the opening of a standpipe receptor and the horizontal center line of the trap outlet shall not exceed 36".
SPS 382.32(4)(b)1.b.
b. The vertical distance between the top of the fixture drain outlet of a pedestal fixture or a cuspidor and the horizontal center line of the trap outlet shall not exceed 60".
SPS 382.32(4)(b)1.c.
c. The vertical distance between the water level in the bowl of a floor outlet water closet or floor outlet clinic sink and the center line of the horizontal portion of the fixture drain may not exceed 36 inches.
SPS 382.32(4)(b)1.d.
d. The vertical distance from the inlet to the horizontal centerline of the fixture drain for a campsite receptor, exterior storm drain inlet, or a receptor for a sanitary dump station may exceed 3 feet so as to permit the trap to be installed below the predicted depth of frost.
SPS 382.32(4)(b)1.e.
e. The vertical distance of a floor outlet fixture between the top of the fixture drain outlet and the horizontal center line of the trap outlet may not exceed 18 inches.
SPS 382.32(4)(b)2.
2. `Horizontal distance.' Except as provided in subd.
2. a. and
b., the horizontal distance between the vertical centerline of a fixture drain outlet and the vertical centerline of the trap inlet shall not exceed 15".
SPS 382.32(4)(b)2.a.
a. The horizontal distance for a pedestal drinking fountain shall not exceed 24".
SPS 382.32(4)(b)2.b.
b. The horizontal distance for an exterior sanitary area drain or a residential garage floor drain discharging through an interior trap shall not exceed 25 feet.
SPS 382.32(4)(b)2.c.
c. The minimum horizontal distance between the vertical centerline of the outlet from a floor-mounted water closet and a 3-inch double tee shall be 30 inches.
SPS 382.32 Note
Note: See ch.
SPS 382 Appendix for further explanatory material.
SPS 382.32(5)
(5)
Direct fixture drain connection. Except as provided in s.
SPS 382.33, all plumbing fixtures and appliances discharging wastes shall connect directly to a drain system.
SPS 382.32(5)(a)1.1. Floor drains shall be so located as to be accessible for cleaning purposes.
SPS 382.32(5)(a)2.
2. A floor drain receiving the wash from garbage cans shall be at least 3" in diameter.
SPS 382.32(5)(b)
(b) Kitchen sinks. Horizontal drain piping serving a kitchen sink trap shall not connect to vertical drain piping by means of a double sanitary tee where an appliance with pump discharge or a food waste grinder are installed.
SPS 382.32(5)(c)
(c) Water closets. A water closet shall discharge through a drain pipe or fitting with a minimum diameter of 3".
SPS 382.32(5)(c)1.
1. A floor mounted wall outlet water closet shall connect to a 4 inch or 4
× 3 inch closet collar fitting or to a horizontal or vertical carrier type fitting.
SPS 382.32(5)(c)2.
2. A floor outlet water closet shall connect to a 4 inch or 4
× 3 inch closet collar fitting.
SPS 382.32(5)(c)3.
3. A wall mounted wall outlet water closet shall connect to a horizontal or vertical carrier type fitting.
SPS 382.32(5)(c)4.
4. Two water closets discharging to a vertical drain from opposite sides by means of the same fitting shall be installed in accordance with subd.
4. a. and
b. SPS 382.32(5)(c)4.a.
a. Where the vertical drain is 3" in diameter, the fitting for floor outlet water closets shall be a 3 inch double wye pattern fitting.
SPS 382.32(5)(c)4.b.
b. Where the water closets are wall outlet types the fitting shall be a double wye pattern fitting or a carrier-type fitting.
SPS 382.32(5)(d)
(d) Blowout-type fixtures. Blowout-type plumbing fixtures shall be installed in accordance with the approval of the department.
SPS 382.32 History
History: Cr.
Register, February, 1985, No. 350, eff. 3-1-85; am. (4) (a), cr. (5) (intro.) and (d),
Register, May, 1988, No. 389, eff. 6-1-88; am. (4) (b) 1. b.,
Register, April, 2000, No. 532, eff. 7-1-00;
CR 02-002: r. and recr. (3) (c) 1. and (4) (b) 2., am. (4) (b) 1. b., cr. (4) (b) 1. d.,
Register April 2003 No. 568, eff. 5-1-03;
CR 02-129: am. (3) (intro.)
Register January 2004 No. 577, eff. 2-1-04;
CR 04-035: am. (3) (a) 3.
Register November 2004 No. 587, eff. 12-1-04;
CR 08-055: cr. (4) (b) 2. c.
Register February 2009 No. 638, eff. 3-1-09; correction in (2), (3) (a) 3., (e), (5) (intro.) made under s.
13.92 (4) (b) 7., Stats.,
Register December 2011 No. 672;
CR 23-006: am. (3) (c) 2., cr. (3) (c) 3., renum. (3) (e) to (3) (e) 1. and am., cr. (3) (e) 2., am. (4) (b) 1., c., cr. (4) (b) 1. e., am. (5) (b), (c) 2. Register September 2023 No. 813, eff. 10-1-23.
SPS 382.33
SPS 382.33 Indirect and local waste piping. SPS 382.33(1)(a)(a) The provisions of this section set forth the requirements for the installation of indirect waste piping and local waste piping.
SPS 382.33(1)(b)
(b) Indirect waste piping and local waste piping draining the fixtures, appliances and devices having a public health concern, including but not limited to those listed in Table 382.33-1, shall be considered as plumbing and shall comply with the provisions of this section.
SPS 382.33(2)
(2)
Materials. Indirect waste piping more than 30" in length and all local waste piping shall be of approved materials in accordance with ch.
SPS 384.
SPS 382.33(3)
(3)
Size. Except as provided in pars.
(a) and
(b), indirect waste piping more than 30" in length and all local waste piping shall be sized in accordance with s.
SPS 382.30.
SPS 382.33(3)(a)
(a) Indirect or local waste piping not exceeding 20 feet in length for refrigerated food display cases may not be less than one inch in diameter.
SPS 382.33(3)(b)
(b) Indirect waste piping, attached to an appliance, appurtenance or equipment through which pressurized waste is discharged, shall be sized in accordance with specifications of the manufacturer of the appliance, appurtenance or equipment.
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See PDF for table 
SPS 382.33(4)
(4)
Installation. Indirect waste piping and local waste piping shall be so installed as to permit access for flushing and cleaning.
SPS 382.33(5)(a)1.1. Gravity flow indirect waste piping more than 30" in length shall be provided with a trap in accordance with s.
SPS 382.32 (4), except indirect waste piping draining a sterilizer shall not be trapped.
SPS 382.33(5)(a)2.
2. All indirect waste piping draining a refrigerated food storage room, compartment or display case shall be provided with a trap in accordance with s.
SPS 382.32 (4).
SPS 382.33(5)(b)
(b) Local waste piping. Local waste piping handling sanitary wastes and more than 30" in length shall be provided with a trap in accordance with s.
SPS 382.32 (4).
SPS 382.33(6)
(6)
Maximum length. Indirect waste piping and local waste piping handling sanitary wastes may not exceed 30 feet in length horizontally nor 15 feet in length vertically.
SPS 382.33 Note
Note: See ch.
SPS 382 Appendix for further explanatory material.
SPS 382.33(7)
(7)
Air-gaps and air-breaks. All indirect waste piping and all local waste piping shall discharge by means of an air-gap or air-break into a receptor.
SPS 382.33(7)(a)
(a) Air-gap installation. The installation of an air gap shall conform to any of the following requirements:
SPS 382.33(7)(a)1.a.
a. The distance of an air gap serving indirect waste piping one inch or less in diameter and a receptor shall be at least twice the diameter of the indirect waste piping.
SPS 382.33(7)(a)1.b.
b. The distance of an air gap between indirect waste piping larger than one inch in diameter and a receptor shall not be less than 2 inches.
SPS 382.33(7)(a)2.
2. The installation of all air-gap fittings shall comply with ASME A112.1.3.
SPS 382.33(7)(a)3.
3. The installation of a residential dishwashing machine manufactured air gap shall comply with ASSE 1021.
SPS 382.33(7)(b)
(b)
Air–break installation. The air-break between indirect waste piping or local waste piping and the receptor shall be accomplished by extending the indirect waste piping or local waste piping below the flood level rim of the receptor and terminating at an elevation above the trap outlet.
SPS 382.33 Note
Note: See ch.
SPS 382 Appendix for further explanatory material.
SPS 382.33(8)
(8)
Receptors. A receptor receiving the discharge from indirect waste piping or local waste piping shall be of a shape and capacity as to prevent splashing or flooding. Receptors shall be installed in accordance with this subsection and shall be accessible.
SPS 382.33(8)(a)
(a) Waste sinks and standpipes. A waste sink or a standpipe serving as a receptor shall have its rim at least one inch above the floor.
SPS 382.33(8)(b)
(b) Floor sinks. A floor sink serving as a receptor shall be equipped with a removable metal basket over which the indirect waste piping or local waste piping is to discharge, or the floor sink shall be equipped with a dome strainer. Indirect waste piping or local waste piping shall not discharge through a traffic grate, but shall terminate over an ungrated portion of the floor sink.
SPS 382.33(8)(c)
(c) Local waste piping. Local waste piping may not receive discharge from another local waste pipe.
SPS 382.33(8)(d)
(d) Other receptors. A plumbing fixture may not be used as a receptor for indirect or local waste piping, except as provided in subds.
1. to
9. SPS 382.33(8)(d)1.
1. The indirect waste piping of a portable dishwasher or water treatment device serving one or 2 outlets may discharge into a kitchen sink of a dwelling unit or to a branch tail piece serving a kitchen sink.
