Should I Leave My Faucets Dripping Tonight?

When It Makes Sense

• Good fit: The overnight forecast calls for a hard freeze—temperatures expected to stay at or below about 20°F (-6°C) for several hours—and the faucets are supplied by pipes running through uninsulated exterior walls, crawl spaces, attics, garages, or other unheated areas. In these conditions, a slow drip keeps water in motion, which is harder to freeze than standing water, and can relieve pressure that builds between an ice blockage and the closed faucet. This applies to both hot and cold supply lines, because either can freeze once the surrounding air is cold enough. If you cannot fully insulate or reroute the pipes before nightfall, dripping is a reasonable short-term protective measure that many plumbers suggest as an emergency tactic during severe cold events.
• Good fit: Your home is older, has a history of frozen pipes, or has already shown warning signs such as reduced water flow, frost on exposed plumbing, or previous bursts in the same line. When a sudden cold snap arrives and there is not enough time for proper winterization, leaving the faucet farthest from the water main entry point dripping—and any faucets fed by exposed lines—can buy time until a licensed plumber can inspect or insulate the system. Opening cabinet doors beneath sinks at the same time lets warmer indoor air circulate around the plumbing and adds another layer of protection. Vacation homes or rooms above unheated garages may also benefit from this temporary step.

When You Should Avoid It

• Warning sign: Overnight lows are forecast to remain above freezing or to touch only briefly around 32°F (0°C). In mild or short-lived cold, water inside heated walls is unlikely to freeze, so dripping wastes water and raises your water or sewer bill without providing meaningful protection. It can also create unnecessary noise and, over time, leave mineral stains or moisture around the sink. Modern homes with interior plumbing and good insulation rarely need faucet dripping unless the heating system fails.
• Warning sign: Your household depends on a private well with limited yield, a septic system, or you live under active drought or water-use restrictions. A continuous trickle can strain a well pump, deplete limited storage, or saturate a drain field. In some communities, municipalities ask residents not to drip faucets during extreme cold events in order to maintain water pressure and fire protection. In these cases, focus on insulation, heat, and sealing instead.

Pros and Cons

Pros

• Can reduce the risk of frozen and burst pipes in vulnerable plumbing during severe cold, potentially preventing expensive water damage and emergency plumbing calls.
• Simple and fast to implement: it requires no tools and can be done as soon as a freeze warning is issued, giving you immediate peace of mind while you arrange longer-term winterization.

Cons

• Wastes water and increases utility or sewer costs, especially if multiple faucets are left dripping repeatedly through the winter.
• It is a temporary fix, not a substitute for insulation, sealing drafts, or maintaining adequate heat; continuous dripping may also mask small leaks or cause sink staining and excess moisture.

Decision Checklist

• What does the overnight forecast predict—will temperatures stay at or below 20°F for several hours, or only dip near freezing for a short time?
• Are the faucets supplied by pipes in uninsulated exterior walls, crawl spaces, attics, garages, or otherwise unheated areas?
• Have you already tried stronger preventive steps tonight, such as opening cabinet doors, sealing gaps, maintaining a steady thermostat setting, and insulating exposed pipes?

Alternatives to Consider

Before relying on dripping, consider more reliable and efficient freeze-prevention steps. Add pipe insulation or heat tape to exposed lines, seal air leaks around windows, doors, sill plates, and where pipes enter walls, and keep garage and basement doors closed. Maintain a consistent indoor temperature day and night, open cabinet doors beneath sinks, and use space heaters safely in unheated areas where plumbing runs. Shut off and drain outdoor faucets, irrigation systems, and hoses, and install frost-free hose bibs if possible. If you will be away from home during a deep freeze, keep the heat on or shut off the main water supply and drain the pipes. These measures often reduce or eliminate the need to drip faucets at all, and they protect your plumbing without the ongoing water waste.

Final Recommendation

If a hard freeze is expected and your plumbing runs through uninsulated or unheated areas, leaving a slow drip on the most vulnerable faucets—especially the one farthest from where water enters the home—is usually a sensible short-term protective step. Pair it with open cabinet doors and a steady thermostat setting for the best results. If temperatures are only mildly cold, your pipes are well insulated inside heated walls, or you have a well, septic system, or local water restrictions, skip the drip and focus on insulation and heat conservation instead. For recurring freeze problems, major plumbing re-routing, or high-stakes decisions about your home’s water system, consult a licensed plumber or your local water utility.