If all our laundry went through tunnel washers, the US would save at least 3 billion gallons of water per week.*
The past and future of laundry
Carl Tashian

I wondered how much water that actually is. It’s less than 500,000 acre-feet per year, if we converted the entire USA. According to http://www.watereducation.org/photo-gallery/california-water-basics, one acre-foot meets the average water needs of 2 households. And just the State of California by itself gets 75 million acre-feet each year of fresh water in its waterways and aquifers.

In 2009 there were 117 million households in the USA. It appears this conversion would save less than 1% of household water usage. Converting the entire USA would save about 1/2 of 1% of the available annual freshwater just in California.

Is it worth it?

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