Shut Off Main Water Supply and Drain Lines

What happens here

Locate the main water shut-off valve for the house, typically found in a utility closet or basement. Turn the valve to completely shut off the water supply to the entire house. Once the main water is off, open the lowest faucet in the house (e.g., a basement utility sink or an exterior hose bib) to drain the remaining water from the pipes and relieve pressure in the system.

Goal: Safely prepare the plumbing system for repair by shutting off water and relieving pressure.