ACSA

Help Prevent Your Water Pipes from Freezing!
Seal all air leaks that may let an icy blast reach your pipes.
Water pipes located next to an outside wall can often be subjected to sub-freezing temperatures. Plumbing located in a garage or any other unheated building is susceptible to low temperatures. Any exposed pipes should be wrapped or insulated. There are other devices such as heat tape which can be used to keep pipes from freezing.

Water flows downhill of its own accord; however, water can flow uphill when pressurized in order to deliver it wherever it's needed. If the delivery system is sufficiently pressurized to maintain proper pressure in the potable water system, turning on your tap will deliver fresh, safe water to you; but a loss of pressure, or a reverse pressure created by an improper connection, can create problems by moving the water in the wrong direction, a condition called backflow.