How to Calculate Water Use?
According to Portland Water Bureau, residential use in Portland is about 52 gallons per person per day. Let's calculate how much water you spend on a day, a week, or even a year compare to the average Portlander.
Toilets
5 times daily
|
Showerheads
5 min daily
|
Faucets
8 min daily
|
|
Pre 1994
|
5.0 gallon per
flush (gpf)
|
3.0 gpm (gallon
per min)
|
3.0 gpm
|
1980-1994
|
3.5-4.5 gpf
|
2.5 gpm
|
|
After 1994
|
1.6 gpf
|
2.0 gpm
|
2.5 gpm
|
Low-flow
|
1.5 gpm
|
Clothes Washer
7 loads weekly
|
Dishwasher
5 times weekly
|
|
1980-1990
|
51 gallons per
load (gpl)
|
14 gpl
|
1990-1995
|
11 gpl
|
|
1995-present
|
43 gpl
|
7-10 gpl
|
Front-loading
|
27 gpl
|
Toilet
_____ household members X 5 flushes per person per day X _____ gallons per flush = __A__ gal/day
Shower
_____ household members X 5 minutes per person per day X _____ gallons per minute = __B__ gal/day
Faucets
_____ household members X 8 minutes per person per day X _____ gallons per minute = __C__ gal/day
Clothes Washer
_____ loads of laundry per week X _____ gallons per load (now divide by 7 to get daily use) = __D__ gal/day
Dishwasher
_____ loads of dishes per week X _____ gallons per load (now divide by 7 to get daily use) = __E__ gal/day
OR
Hand-Washed Dishes
_____ meals per day that require dishwashing X 2.5 gallons of water per meal = __E__ gal/day
Other Usage
Other water consumption around the house that was not mentioned above; for instance, fish tank, water gardens, cooking, etc...
Estimated miscellaneous water use = __F__ gal/day
Add the values (A to F) to get the total daily water use of the appliances in your home.
Toilets
|
Shower
|
Faucets
|
Clothes Washer
|
Dishwasher
|
Others
|
Total
|
Divide this value by the number of household members to get the total amount of water consumed by each person. Is this value greater or less than the 52 gallons per person state average?
_____ gal/day divided by _____ household members = _____ gallons per person per day
Portland Water Rates, Fiscal Year 2016-2017, 1.8 gallons cost a penny.
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