What should be done before cutting into a plumbing pipe?

Before cutting into a plumbing pipe, turning off the water supply is crucial to prevent flooding. This step ensures that the water flow is completely halted in the section of pipe being cut, which minimizes the risk of water spraying or gushing out when the pipe is severed. Doing so protects both the work area and the surrounding environment from potential damage, and it also keeps the plumber safe from unexpected water pressure release.

While notifying the homeowner, removing fixtures, and inspecting for leaks are all important steps in the plumbing process, they do not address the immediate risk posed by water escaping from a pipe during cutting. Ensuring that the water supply is shut off takes precedence to effectively manage the situation and avoid complications during the repair or installation work.