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... An acre-foot is enough to supply two homes for a year.

Half an acre-foot is 162,926 gallons (per a couple of different online conversion programs). I'm in the Great Lakes area where we don't pay much for water and our house (two people) uses about 30,000 gallons/year. Even when we were watering a few new trees we only got to 40,000 gallons/year. We don't do anything special to conserve except the toilets are the low flush type and faucets/sinks have typical 2 gallons/minute aerators (flow restrictors).

What are they doing in San Diego to use 5x the water we use here?