A water dispensing apparatus switches from a city water supply line to an auxiliary water reservoir when the city water supply line becomes unacceptable. A valve connects, alternatively, city water and auxiliary water supply lines to a consumer water supply line. Auxiliary water is supplied from a water accumulator to the auxiliary water supply line and replenished by pumping from the auxiliary water reservoir in response to detection by a pressure switch of low accumulator pressure. A check valve is inserted in the auxiliary water supply line downstream of an electric pump and upstream of the pressure switch. A low water level detector operates a switch to cut off power to the pump when the level of water in the auxiliary water supply reservoir falls below a predetermined value.
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