Household water usage ultimately ends up back in the watershed. It is not entirely wasted, but does take energy to treat and send to your house. Agricultural water and water for lawns and other outdoor applications do in fact waste water. Californias entire agricultural system is based on enormous well water usage to grow water intensive crops in a desert. Perhaps desalination efforts could help reduce strain on watersheds, but it would cost quite a lot. I’d be willing it would cost less than losing all of Californias farmland when the aquifer dries up, though.
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