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 D - Minimum Water Distribution Pipe Size

Type of Fixture or Device (See Footnotes 1 & 2)

Pipe Size (inches)

Bathtubs

1/2

Combination sink and tray

1/2

Drinking fountain

3/8

Dishwasher (domestic)

1/2

Dishwasher (commercial)

3/4

Kitchen sink (residential)

1/2

Kitchen sink (commercial) 1 Faucet

1/2

Kitchen sink (commercial) 2 Faucets

3/4

Lavatory

3/8

Laundry tray (1, 2 or 3 compartment)

1/2

Shower (single head)

1/2

Sinks (service/slop)

1/2

Sinks (flushing rim)

3/4

Urinal (flush tank)

1/2

Urinal (direct flush valve)

3/4

Urinal (siphon jet)

1

Washing machine (automatic)

1/2

Water closet (tank type)

3/8

Water closet (flush valve type)

1

Hose bibbs

1/2

Wall hydrant

1/2