Should I Drip My Faucets During A Freeze?

When It Makes Sense

• Good fit: The local forecast calls for a hard freeze, generally when temperatures are expected to fall to 20°F (-6°C) or below for several hours, and the home has pipes in unheated or poorly heated areas such as crawl spaces, attics, garages, or exterior walls. In these locations, standing water can freeze inside the pipe, expand, and split the pipe wall. Allowing a thin stream or steady drip to flow keeps water moving and gives pressure from expanding ice an escape path, which lowers the chance of a burst. It is especially useful for the faucet farthest from where the water enters the house, because that run of pipe is often the most exposed.
• Good fit: The faucet at risk is served by an exposed or hard-to-insulate section of plumbing, or the freeze is forecast before you can install insulation, heat tape, or other permanent protection. Examples include older homes with pipes inside exterior walls, plumbing in a rarely heated guest bathroom, a laundry room on an outside wall, or a kitchen sink with no access to the pipe behind it. A temporary drip is a reasonable stopgap when better protections cannot be put in place quickly and the alternative is risking a frozen or burst pipe.

When You Should Avoid It

• Warning sign: The local water authority has imposed drought restrictions, the home relies on a septic system that may be overloaded by continuous flow, or the water supply comes from a private well with a pump that may be strained by long hours of operation. In these cases, the water loss and system load from dripping faucets can create their own problems, and other freeze-protection methods should be prioritized. Septic systems in particular can be stressed by the extra hydraulic load, and well pumps may cycle excessively if the drip is too small or the pressure tank is large.
• Warning sign: The drain line serving the faucet is itself exposed to freezing air, such as a sink drain in an unheated garage, a cabin, a poorly insulated basement, or a seasonal home. A slow trickle of water can freeze inside the drain trap or drain pipe, causing a blockage, backup, or cracked drain. Similarly, if the outdoor temperature is extremely low and the dripping water exits onto walkways, driveways, or near the foundation, it can form ice hazards for people and pets or contribute to moisture problems around the foundation.

Pros and Cons

Pros

• Moving water is less likely to freeze than stagnant water, and an open faucet provides a pressure-relief point. If ice does form inside the pipe, the expanding water can push out through the faucet opening rather than cracking the pipe wall, reducing the risk of costly water damage, flooding, mold growth, and structural repairs.
• It is an inexpensive emergency measure that requires little equipment or preparation. Once a faucet is opened to a steady drip or thin stream, the protection begins immediately, which is useful when a freeze arrives suddenly and there is no time to install insulation, heat cable, or perform plumbing repairs.

Cons

• A dripping faucet wastes water and increases water and sewer bills. The cost is usually far less than repairing a burst pipe, but over several days or across multiple faucets the waste can be significant, especially in regions with high water costs, tiered water rates, or strict conservation rules. The environmental cost of wasted treated water is also a consideration.
• It can provide a false sense of security. Dripping may not protect pipes in the coldest corners of a house, may not help if the main supply line or a drain line freezes, and does nothing to address the underlying problem of poor insulation or air leaks. It can also mask a developing freeze until the flow slows or stops entirely, leaving the homeowner unaware that ice has already formed upstream.

Decision Checklist

• Have I identified the pipes most at risk—those in exterior walls, unheated attics or crawl spaces, garages, or locations with a history of freezing—and confirmed that opening the faucet will keep water moving through those specific sections rather than just the drain?
• Am I subject to drought restrictions, do I have a septic system, or do I depend on a well pump that could be strained by continuous running water? If any of these apply, I should evaluate alternatives before leaving faucets dripping for long periods.
• Have I combined the drip with other short-term measures, such as opening cabinet doors, keeping the thermostat steady, sealing cold-air leaks, protecting outdoor faucets, and asking someone to check the house if I leave, rather than relying on dripping alone?

Alternatives to Consider

Open cabinet doors beneath sinks so warm indoor air can reach pipes inside exterior walls, and keep the thermostat at a steady temperature both day and night rather than lowering it overnight. Add pipe insulation, foam sleeves, or fiberglass wrap to exposed plumbing, especially in basements, crawl spaces, attics, and garages. For sections that stay cold, install electric heat tape or heat cable according to the manufacturer’s instructions and any applicable local electrical codes; these can provide targeted warmth where insulation alone is not enough. Shut off and drain outdoor faucets, irrigation systems, and hose bibs before cold weather arrives, and consider replacing standard sillcocks with frost-free hose bibs. Seal gaps around pipes, vents, and foundations where cold air enters. In severe cold, a thin stream about the width of a pencil is often more effective than a slow drip because faster-moving water is harder to freeze. If leaving the house during freezing weather, maintain heat, ask a neighbor or friend to check on it daily, or hire a plumber to drain the water system.

Final Recommendation

Dripping faucets is a sensible short-term tactic when a hard freeze threatens pipes in unheated or hard-to-protect locations, but it should be treated as one part of a broader freeze-protection plan, not a complete solution. If your plumbing is already insulated, if you face water restrictions or septic-system limits, or if your drains are exposed to freezing air, rely on other methods first. For high-stakes situations—older plumbing, repeated freeze problems, homes in very cold climates, or uncertainty about which pipes are at risk—consult a licensed plumber or your local water utility for guidance tailored to your home and climate.