Shut it off, you never know when a pipe could burst or the seal in a fixture could begin leaking. Our neighbor had a feeder line to a toilet bowl spring a leak and run for several weeks before being discovered. The damage was extensive, disruptive, and very expensive. If you have a cheap plastic throw valve, replace it with a quality brass fitting. Turning off your H2O when not there takes all of about 5 seconds and the peace of mind is well worth the effort. Just remember to turn off the power source to your hot water heater as well so you eliminate the risk of frying a dry tank.
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