Capacity Estimator

Use	Flow rate (gpm)	Total use (US Gallons)
Adult or child		50-100/day
Automatic washer	5	30-50/load
Dishwasher	2	7-15/load
Garbage Disposer	3	4-6/day
Kitchen sink (a)	3	2-4/use
Shower or tub	5	25-60/use
Toilet flush	3	4-7/use
Bathroom lavatory sink	2	1-2/use
Water softener regeneration	5	50/100/cycle
Backwash filters	10	100-200/backwashing
Outside hose faucet	5	5 gpm X minutes used

(a) water flow restricting valves and shower heads can reduce flow and water use by up to 50%.

Source: USDA “Water Systems Handbook.”

Average sewage flow gallons per day	Minimum Gallons Effective Capacity(1)
0-500	900
601-700	1200
801-900	1500

Source: Florida ASHI Seminar, Kissimmee, October 1993

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