Ill. Admin. Code tit. 77, pt. 890, subpt. M, app A, tbl. E

Current through Register Vol. 49, No. 2, January 10, 2025

Table E - Drainage Fixture Units (D.F.U.) Per Fixture Group

Type of Fixture	D.F.U./Fixture (Load)	Minimum Size of Trap2 (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 Trap2 (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 sink2 (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

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.

Ill. Admin. Code tit. 77, pt. 890, subpt. M, app A, tbl. E

Amended at 28 Ill. Reg. 4215, effective February 18, 2004