Water supply fixture units (WSFU) for typical non-potable applications.1
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Appliances, appurtenances, or fixtures Minimum fixture branch pipe size (inches) Water supply fixture units (WSFU)
Private Public Assembly
Clothes washer 1/2 4.0 4.0
Dishwasher, domestic 1/2 1.5 1.5
Hose Bibb 1/2 2.5 2.5
Lawn sprinkler, each head 1/2 1.0 1.0
Urinal, 1.0 gpf2 flushometer valve 3/4 3.0 4.0 5.0
Urinal, > 1.0 gpf flushometer valve 3/4 3.0 4.0 5.0
Urinal, flush tank 1/2 4.0 5.0 6.0
Toilet, 1.6 gpf gravity tank 1/2 2.5 2.5 3.5
Toilet, 1.6 gpf Flushometer tank 1/2 2.5 2.5 3.5
Toilet, 1.6 gpf flushometer valve 1 5.0 5.0 8.0
Toilet, > 1.6 gpf gravity tank 1/2 3.0 5.5 7.0
Toilet, > 1.6 gpf flushometer valve 1 7.0 8.0 10.0

1Values excerpted from Table 1 2.1, Minnesota Plumbing Code (2015) Appendix A.
2 gpf = gallons per flush

This page was last edited on 20 October 2017, at 14:01.

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