Where are the lavatory water shutoff valve locations?

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Lavatory water shutoff valves are placed in the lavatory area so the water supply to the lavatories can be quickly isolated when needed. The standard locations are at the base of the service cabinet and behind the toilet paper dispenser. These spots are chosen because they are easily accessible to cabin crew during service or in an emergency, and they keep the valve within the lavatory where the water system is served. Other locations like the cockpit instrument panel or the cargo hold don’t relate to the lavatory water system, and behind a lavatory mirror isn’t a typical or reliable access point for shutting off the water.