The information below is provided by the Washington Suburban Sanitary Commission and shows the typical water usages of different activities

Inside the House

ACTIVITY GALLONS USED (conventional) GALLONS USED
(water saving)
Toilet flushing 5-7 gallons per flush 1 1/2 - 3 1/2 gallons per flush
Shower (water running) 7 - 10 gallons per minute 2 - 4 gallons per minute
Bath (full tub) 36 - 50 gallons (conventional) 30-40 gallons (conventional) 40-80 gallons (whirlpool)
Laundry Machine (full load) As much as 60 gallons (top loader) As much as 42 gallons (top loader)
Dishwasher 15 gallons normal load 7 1/2 - 10 gallons normal load
Dishwashing by Hand 30 gallons tap running 10 - 20 gallons w/ stopper in sink
Shaving 20 gallons tap running 1 - 2 gallons water in sink
Brushing Teeth 10 gallons tap running 1 - 2 pints water in cup or glass
Washing Hands 2 gallons tap running 1 - 2 gallons tap running

During hot, dry conditions, general water consumption for bathing, laundry, and overall water usage increases.

ACTIVITY / PER PERSON ONE TIME EACH DAY

GALLONS USED
(no water saving devices)

COMMENTS

BATH 36-50 GAL.  
SHOWER (WATER RUNNING) 7 - 10 GAL. PER MINUTE
  • THE AVER. SHOWER = 12 TO 15 MIN.
    A 15 MIN SHOWER = APPROX. 150 GAL.
  • MANY PEOPLE TAKE LONGER THAN 15 MINUTE SHOWERS.
  • OFTEN, DURING THE HOT WEATHER WE SHOWER MORE THAN ONE TIME PER DAY.
LAUNDRY 60 GAL.
(Top Loader - Full load)
  • WE WEAR MANY MORE WASHABLE FABRICS IN THE HOT WEATHER.
  • WE DRY CLEAN MORE IN THE COLD MONTHS.
  • WE CHANGE OUR CLOTHING MORE OFTEN IN THE HOT MONTHS.

Outside the House
During dry conditions, customers generally water lawns and gardens more frequently. Also, usage due to washing cars, home maintenance, pools or playing in sprinklers, and general outside activities increases. The Commission rate, per thousand gallons of water used, increases as the number of gallons used per day rises, i.e. the Average Daily Consumption (ADC). The ADC, and therefore the cost per thousand gallons of water, is often increased due to (dry) seasonal water usage.

HOSE SIZE LBS. PRESSURE PER SQ. INCH TIME GALLONS USED
1/2 inch

60

1 hour 630
5/8 inch

60

1 hour 1,020
3/4 inch

60

1 hour 1,860