Broken water lines result in enormous losses for property owners and tenants from water damage every year throughout cold climate regions. Preparing plumbing lines for cold weather can help prevent water leaks that occur when exposed to freezing temperatures (at or below 32 degrees Fahrenheit) causes water in lines to freeze, expand, increase pressure, and break the pipes. Winterizing your home's water lines is essential to protect your home, your personal possessions, and the health and safety of everyone who lives in your house. Below is a set of step-by-step instructions for winterizing water lines in the house.