On a calm day, in this order: the curb stop at the meter, which the city side controls; the house valve, usually where the service line enters, at a hose bib, or in older San Gabriel homes inside a small wall box or near the water heater; and the fixture valves under sinks and behind toilets. Turn each gently to confirm it actually closes, tag the house valve, and tell the household. A valve that will not close is a small scheduled repair today and a catastrophe multiplier at 2 a.m.; price it accordingly.
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