Americans use 24 gallons of water each day to flush their toilets—approximately 5.8 billion gallons.
Glennon, R. 2009. Unquenchable: America’s Water Crisis and What To Do About It. Cited by Cho, Renee. 2015. ‘From Wastewater To Drinking Water – State Of The Planet’. Blogs.Ei.Columbia.Edu. https://web.archive.org/web/20150105224653/http://blogs.ei.columbia.edu/2011/04/04/from-wastewater-to-drinking-water/.