That figure doesn't factor in the costs of transporting the water, but these seem like minor costs to me. I wonder if there are any costs I'm not thinking of. Even if it were 3X as much, it still seems reasonable.
According to this site, Americans use ~100l/person/day.
I think we need a discussion thread for the californian drought going on. I would like to compile information in the main post and would like help compiling it. If we really are proud to be effective altruists then this is an area we should really figure out.
Any one have any good ideas on how we can help?