Fixture Water Consumption and Required Water Supply

Supply requirements for common fixtures. Each fixture in a water supply system represents a certain demand of water.

Fixture	Flow rate (gpm)	Flow rate (l/min)	Minimum Supply Pressure (psi)	Minimum Supply Pressure (kPa)
Aspirator	2.5	10	8	55
Bathtub faucet	5	19	8	55
Bidet	2	7.5	4	28
Combination fixture	4	15	8	55
Dish washing machine	4	15	8	55
Drinking fountain jet	0.75	3	8	55
Hose bib or sillcock, 1/2"	5	19	8	55
Laundry faucet 1/2"	5	19	8	55
Laundry machine	4	15	8	55
Lavatory faucet, ordinary	2	7.5	8	55
Lavatory faucet, self closing	2.5	10	8	55
Shower head	5	19	8	55
Shower, temperature controlled	3	10	20	138
Sink faucet 3/8", 1/2"	4.5	17	8	55
Sink faucet 3/4"	6	23	8	55
Urinal flush valve	15	56	15	110
Water closet with flush valve	35	132	25	170
Water closet with gravity tank	2.5	10	8	55
Water closet with close coupled tank, ballcock	3	11	8	55