[wkyle]

The parent comment suggests a progressively priced system that would presumably allow for cheap consumption of water at small quantities. I think the comments here discarding this idea by claiming price sensitivity doesn't exist for wealthy people are unimaginative.

I'm not totally sold on on the idea, but it is very possible to create a tiered pricing system that makes domestic water waste unsustainably expensive. The price required to deter consumption may be absurdly high, but demand elasticity will always exist at high enough prices.