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Illinois Administrative Code (Last Updated: March 27, 2024) |
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TITLE77. PUBLIC HEALTH |
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PART890. ILLINOIS PLUMBING CODE |
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SUBPARTM. INSPECTIONS, TESTS, MAINTENANCE AND ADMINISTRATION |
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Section890.APPENDIX A. Plumbing Materials, Equipment, Use Restrictions and Applicable Standards |
§890.TABLE E. Drainage Fixture Units (D.F.U.) Per Fixture Group
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Type of Fixture
D.F.U./Fixture (Load)
Minimum Size of Trap2 (inches)
Bathroom groups:
1 tank water closet, 1 lavatory
with 1¼ inch trap and 1
bathtub1 or shower stall
7
1¼
1 water closet with flush valve, 1
lavatory with 1¼ inch trap and 1
bathtub or shower1
11
Bathtub (with or without overhead shower)1
2
1½
Bathtub1
3
2
Bidet
2
1½
Clothes washer, automatic
3
2
Dental unit or cuspidor
1
1¼
Drinking fountain
½
1
Dishwasher2, domestic
2
1½
Floor drains
See Appendix A, Table F
2
Lavatories:
Lavatory
1
1¼
Lavatory
2
1½
Lavatory, barber, beauty parlor
2
1½
Lavatory, dental
1
1¼
Lavatory, surgeon's
2
1½
Laundry tray (1 or 2 compartments)
2
1½
Type of Fixture
D.F.U./Fixture (Load)
Minimum Size of Trap2 (inches)
Shower stall
3
2
Showers (group) per head2
3
2
Sinks:
Combination sink and tray
3
1½
Combination sink and tray with
food-disposal unit
4 Separate Traps
1½
Flushing rim (with valve)
8
3
Kitchen sink, domestic
2
1½
Kitchen sink, domestic, with food-waste
grinder
3 Separate Traps
1½
Pot, scullery, etc.2
4
1½
Service (P trap)
3
3
Service (P trap)
2
2
Surgeon's
3
1½
Wash sink2 (circular or multiple),
each set of faucets
2
1½
Urinals:
Urinal, pedestal, siphon jet, blowout
8
2
Urinal stall
3
2
Urinal, wall integral trap
3
2
Urinal, wall P trap, exposed
2
1½
Water closets:
Tank operated
4
3
Valve-operated
8
3
1A shower head over a bathtub does not increase the fixture value.
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)