Can a Single Dripping Faucet Really Prevent Frozen Pipes?

How important is a dripping faucet? Very important, especially when it prevents your water pipes from bursting in freezing temperatures. Burst pipes are one of the leading causes of property damage during cold spells, with homeowners facing an average cost of more than $10,000, according to the Insurance Information Institute. For business owners, the cost is even higher, averaging around $27,000, and in some cases, claims can reach into the millions, as noted by a report from Philadelphia Insurance Companies.

But can a single dripping faucet truly make a difference? The answer is yes, but it needs to be in the right place. Ideally, the faucet should be located as far from the water supply as possible so the water travels through the entire plumbing system. If you're unsure of the water source's location, simply letting any faucet drip will help. There's a common misconception that the drip keeps the water flowing, preventing freezing. While that can help, the real benefit lies in relieving pressure that builds up in the pipes between the frozen area and the faucet, preventing bursts when the pipes begin to thaw.

Pipe joints are particularly susceptible, but freezing water — which expands — can put stress on both metal and plastic pipes at virtually any point. The damage occurs when the pipes freeze, but the real trouble begins once they thaw. The combined pressure of the ice blockage expanding and contracting, along with the rising water pressure behind it, can lead to pipes leaking or bursting. This is why it's crucial to keep a faucet running if a pipe is fully frozen, even if it's not producing enough water for a drip. When the ice melts, the water needs an escape to release the built-up pressure.

When temperatures hover around or dip below 20°F (-6°C), it's time to let at least one faucet drip. Pay special attention to water pipes located in unheated spaces such as attics, garages, basements, or crawl spaces, as these areas typically mirror outdoor temperatures. Also, ensure pipes running along exterior walls are well-insulated. If a faucet is in a base cabinet, like in kitchens or bathrooms, open the cabinet doors to allow warmer air from inside the house to reach the pipes. This is especially important for sinks along exterior walls.

It’s wise to know where your home’s main shut-off valve is located, just in case a pipe bursts or leaks. Typically, the main shut-off valve is found where the main water line enters the house, but it could also be near the exterior water meter. Being able to quickly turn off the water supply can prevent a major flooding disaster from turning into a minor inconvenience and help you save money.