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Type of Fixture
D.F.U./Fixture (Load)
Minimum Size of Trap(inches)
Bathroom groups:
1 tank water closet, 1 lavatory with 11/4 inch trap and 1 bathtub1 or shower stall
7
11/4
1 water closet with flush valve, 1 lavatory with 11/4 inch trap and 1 bathtub or shower1
11
 
Bathtub (with or without overhead shower)1
2
11/2
Bathtub1
3
2
Bidet
2
11/2
Clothes washer, automatic
3
2
Dental unit or cuspidor
1
11/4
Drinking fountain
1/2
1
Dishwasher2, domestic
2
11/2
Floor drains
See Appendix A, Table F
2
Lavatories:
 
 
Lavatory
1
11/4
Lavatory
2
11/2
Lavatory, barber, beauty parlor
2
11/2
Lavatory, dental
1
11/4
Lavatory, surgeon's
2
11/2
Laundry tray (1 or 2 compartments)
2
11/2


Type of Fixture
D.F.U./Fixture (Load)
Minimum Size of Trap(inches)
Shower stall
3
2
Showers (group) per head2
3
2

Sinks:
   
Combination sink and tray
3
11/2
Combination sink and tray with
food-disposal unit
4 Separate Traps
11/2
Flushing rim (with valve)
8
3
Kitchen sink, domestic
2
11/2
Kitchen sink, domestic, with food-waste grinder
3 Separate Traps
11/2
Pot, scullery, etc.2
4
11/2
Service (P trap)
3
3
Service (P trap)
2
2
Surgeon's
3
11/2
Wash sink(circular or multiple),
each set of faucets
2


11/2
Urinals:
 
 
Urinal, pedestal, siphon jet, blowout
8
2
Urinal stall
3
2
Urinal, wall integral trap
3
2
Urinal, wall P trap, exposed
2
11/2
Water closets:
 
 
Tank operated
4
3
Valve-operated
8
3

  1. 1A shower head over a bathtub does not increase the fixture value.
  2. 2See Appendix A:  Table F and Section 890.1330(b) for method of determining unit values of fixtures not listed in this Table or for rating of devices with intermittent flows.
(Source: Amended at 28 Ill. Reg. 4215, effective February 18, 2004)

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