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Capacity Estimator

Home Water Requirements

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."

Septic Tank Capacity vs Usage

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

 
Source: 

Florida ASHI Seminar, 

Kissimmee, October 1993