Cities often have systems, we're in rural Australia and are water conscious- as far as dish and clothes washing go that's grey water discharge which goes onto a near house mulch pit for household rottables and garden waste, the water that reaches the pit bottom hits a crushed stone bed with slotted pipe that drains water to above the vegetable garden and fruit trees (between the leach drains ) where it moves through the soil making tomatoes, potatoes, figs, oranges, lemons, grapefruit, etc.

No dishwasher, no tap running - but regardless of how much water we use in the kitchen none of that truly goes to waste, if we use more we just put less on the garden from the same source tanks (which are all level gauged).