The time it takes for household water pressure to build back up after being shut off is almost instantaneous, typically taking only a few seconds to a minute. When you reopen your main water supply valve, water rushes rapidly through the pipes, expelling trapped air out through the open faucets and restoring full system pressure almost immediately. However, if your plumbing system contains an accumulator tank or a well pressure tank with a waterlogged bladder, or if air pockets are trapped in long branch lines, it may take a few minutes of running multiple fixtures to fully stabilize. Verification: Open a faucet fully to bleed out trapped air until the water stream runs clear and steady.
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