The 2012-2015 Drought is almost entirely a Surface Water Reservoir water shortage, not depletion of groundwater basins or a cutback in water allocation from the Colorado River. So all that matters is the proportion of imported water from northern California that cities use.

City of Rancho Santa Fe uses 70% imported water but that is about to change. The new Carlsbad Desalting Plant will be producing potable water for 220,000 households in northern San Diego County in 2016 that will reduce reliance on imported water.

And the City of Los Angeles is reliant on imports for 81% of its water supply.

So the lower income family in East Los Angeles with a household size of 5 or 6 will be using more imported water than the City of Santa Fe. Moreover, the population of Santa Fe only has a population of about 3,200. The City of Los Angeles has a population of 8.2 million.

So it is the City of Los Angeles that is consuming the most imported water by far.