Knowing how much water we use is the first step towards planning for future water supply.
Although less than 1 gallon/day of water is needed for drinking, more water is needed for sanitation and household use. Globally per capita domestic water usage in the 1990s covered a large range:
(OECD, World Resources Institute, from Loucks).
Essential indoor water use in the US averages 70 gallons per capita daily with the remaining going to outdoor uses, largely landscape irrigation. Usage within the US varies widely depending upon the amount of outside usage, adoption of indoor water conserving fixtures, metering, and system losses.
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