No, you cannot safely or effectively repair a pressurized water pipe leak without first turning off the water supply. Attempting to fix a live, pressurized supply line will result in uncontrolled spraying that prevents adhesives, epoxies, or tape from bonding to the pipe surface, flooding your home in seconds. Even on low-pressure drain lines, active wastewater flow will ruin repairs. You must always locate and close the relevant local angle stop or main indoor water shut-off valve, drain the residual water from the lines completely, and dry the pipe surface before applying any permanent fix. Verification: Confirm that the water is completely shut off and lines are drained before starting any plumbing repair work.
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