Drainage Fixture Unit Table


Type of Fixture or Group of Fixtures
Based on the 2006 International Plumbing Code
Fixture Units
Automatic clothes washer, commercial 3
Automatic clothes washer, residential 2
Bathroom group consisting of water closet, lavatory, bathtub or shower, including or excluding a bidet, an emergency floor drain, or both. (1.6 gpf water closet) 5
Bathroom group consisting of water closet, lavatory, bathtub or shower, including or excluding a bidet, an emergency floor drain, or both. (greater than 1.6 gpf water closet) 6
Bathtub (with or without overhead shower) 2
Bidet 1
Combination sink-and-tray 2
Dental unit or cuspidor 1
Dental lavatory 1
Drinking fountain 0.5
Dishwasher, domestic 2
Floor drains 2
Kitchen sink, domestic 2
Kitchen sink, domestic, with food waste grinder and/or dishwasher 2
Lavatory 1
Laundry tray (1 or 2 compartments) 2
Shower 2
Service sink 2
Sink 2
Urinal 4
Urinal, 1 gallon per flush or less 2
Urinal, waterless 0.5
Wash Sink (circular or multiple) each set of faucets 2
Water closet, flushometer tank, public or private 4
Water closet, private (1.6 gpf) 3
Water closet, private (flushing greater than 1.6 gpf) 4
Water closet, public (1.6 gpf) 4
Water closet, public (flushing greater than 1.6 gpf) 6
Fixture drain or trap size:  
      1¼" 1
      1½" 2
      2" 3
      2½" 4
      3" 5
      4" 6

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