Illinois Administrative Code
Title 77 - PUBLIC HEALTH
Part 890 - ILLINOIS PLUMBING CODE
Subpart M - INSPECTIONS, TESTS, MAINTENANCE AND ADMINISTRATION
Appendix A - Plumbing Materials, Equipment, Use Restrictions and Applicable Standards
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