Frozen water service line: prevention and what to do

A frozen water service line can shut off water to the whole house, but the next step depends on where the freeze is: inside your home, at the meter, or in the underground line between the street and the house. Start by checking whether neighbors still have water, then protect the house from burst-pipe damage and call the right party if the problem appears to be at the meter or service line. (minneapolismn.gov)

Why water service lines freeze

Your water service line is the pipe that brings water from the water main to your meter and then into the house. Minneapolis says a service line can freeze during very cold weather if frost reaches the depth of the line or if the area where the line enters the home is not heated. (minneapolismn.gov)

Frozen pipes are more likely where cold air reaches them. EPA recommends insulating water lines along exterior walls and shutting off and draining outdoor spigots before freezing weather arrives. Philadelphia also tells residents to wrap pipes in unheated areas, repair broken windows, and caulk around cold spots near meters and pipes. (epa.gov)

A service line freeze is not the most common outcome in every cold spell. Minneapolis notes that most service lines are buried deep enough not to freeze, and homes without a history of freezing are less likely to have the problem. Still, lines that have frozen before, shallow lines, drafty basements, crawl spaces, and vacant homes are at higher risk. (minneapolismn.gov)

How to tell where the freeze may be

A quick first check is simple: ask a neighbor if they have water. Philadelphia says that if neighbors also have no water, the issue may be a water main break. If neighbors do have water, the problem is more likely on your property. (water.phila.gov)

Next, check how much of the house is affected. Independence says that if only one faucet is not working, or only the hot side or cold side is out, the frozen section is often somewhere inside the home, such as under a sink, in a crawl space, near the water heater, or along an outside wall. (independencemo.gov)

If there is no water anywhere in the house, the problem may be bigger. Minneapolis says a frozen service line is more likely when there is no water anywhere in the house and your supply line and master shutoff valves are open. Chesterfield says that if no water comes from any tap, there is a chance the service line or meter is frozen. (minneapolismn.gov)

Watch for early warning signs too. Philadelphia says reduced flow or weak pressure can be the first sign of freezing before the line shuts down completely. If you are not sure what part of the system you are looking at, this guide to the curb stop, meter and property line can help you sort out the pieces. (water.phila.gov)

What to do right away

When water stops during a freeze, move in order:

1. Check whether the outage is at one fixture, one side of the system, or the whole house. One dead faucet often points to an indoor pipe; no water anywhere can point to a meter or service line problem. (independencemo.gov)
2. Ask a neighbor if they still have water. If they do not, report a possible main break to the utility. (water.phila.gov)
3. Find your meter area and your house-side shutoff valve now, before anything bursts. Philadelphia says the house-side valve is usually near the meter. (water.phila.gov)
4. If you see a split pipe or active leak, shut off the water promptly to limit damage. (water.phila.gov)
5. If the whole house is out and you suspect the meter or service line, call the utility and ask whether they can check the meter or confirm whether the freeze is on their side or yours. Chesterfield says customers can request a meter check in that situation. (chesterfield.gov)
6. If the freeze appears to be on the private side, call a licensed plumber or a contractor who handles frozen water service lines. Minneapolis says a qualified thawing contractor may be needed if you cannot thaw the line yourself. (minneapolismn.gov)

If you need a quick place to start, use the Water line responsibility check or search your city, county or ZIP for local utility rules. Because local ownership, permit, and plumber-license rules vary, confirm the details with your water utility and local building or plumbing office. (minneapolismn.gov)

Safe ways to thaw pipes at home

Home thawing is mainly for exposed indoor piping you can reach safely. EPA says not to thaw frozen pipes with a torch. Chesterfield, Independence, and Lexington all recommend slow, even warming instead, such as a hair dryer, heat lamp, heating pad, or gentle warm air. (epa.gov)

Independence warns against heating only one small spot on the pipe, because uneven heating can help a pipe burst. It also warns not to use electrical appliances around standing water. (independencemo.gov)

Opening a faucet can help relieve pressure and let meltwater escape while you thaw a line. Chesterfield says to open the cold-water faucet nearest the freeze, and Philadelphia says to make sure the faucet is on so water can drip out as thawing happens. But do not leave a faucet running unattended while you leave the house or while you are unsure where the frozen section is. (chesterfield.gov)

If the line starts thawing, stay nearby and watch closely. Minneapolis says a meter may drip if it was damaged by freezing, and Philadelphia says to inspect both pipes and meter after thawing. If you cannot locate the frozen section, cannot reach it safely, or suspect the underground service line is frozen, it is time to call a pro. (minneapolismn.gov)

How to prevent the next freeze

The best prevention is warmth, insulation, and airflow in the right places. Chesterfield says never to set the thermostat below 55°F in freezing weather. Philadelphia says to keep the water meter area above 40°F. Opening cabinet doors under sinks can also help warm air reach pipes along outside walls. (chesterfield.gov)

EPA recommends insulating water lines that run along exterior walls and shutting off and draining outdoor spigots before freezing temperatures arrive. Philadelphia adds that disconnecting garden hoses and leaving the outside faucet open after shutting off the indoor supply helps drain that section of pipe. (epa.gov)

If your home has a history of freezing, a controlled drip may help. Philadelphia says to take action when the forecast calls for temperatures below 32°F, especially for two days or more, and to let the faucet drip if pipes have frozen before or are in a space you cannot keep warm. Minneapolis says only a pencil-width stream is needed and says not to turn that faucet off until the ground is fully thawed if the utility or your situation calls for continuous running. Chesterfield says a slow drip may help when temperatures are expected to fall below 20°F. Local instructions vary, so follow your utility's advice for your address. (water.phila.gov)

Vacant homes need special care. Philadelphia says that if you will be away during cold weather, the home plumbing system should be drained and winterized. That matters because a frozen pipe in an empty house can turn into major damage before anyone notices. (water.phila.gov)

If the same service line freezes again and again, a short-term drip is not a real fix. Minneapolis suggests talking with a qualified contractor about lowering the service line so frost cannot reach it. If you are weighing a bigger repair, it may also help to review Who is responsible for the water line to your house? and Water line leak in your yard: what to do. (minneapolismn.gov)

Who pays for a frozen service line repair

This is the part that surprises many homeowners: responsibility is not the same everywhere. Minneapolis says property owners own the water service line from its connection to the water main to its connection to the meter, and owners are responsible for hiring and paying for repairs if that line leaks or freezes. (minneapolismn.gov)

Other systems split responsibility differently. Chesterfield says the county repairs leaks in the meter box and on the street side of the meter box, while the customer is responsible for the service line to the house and other plumbing on the customer side. Philadelphia says the water department is not responsible for private pipes, even if those pipes are outside the home. (chesterfield.gov)

That is why it is worth checking your local rules before there is an emergency. Start with your utility's ownership diagram, then ask whether meter damage, curb stop issues, thawing, excavation, permits, and restoration are handled by the utility or by the property owner. You can also browse local pages by state at /states. (minneapolismn.gov)

After any freeze, keep an eye on the meter and your next bill. A small split can show up only after thawing, and a hidden break can lead to a high bill. If that happens, this guide on High water bill? How to find a hidden leak can help with the next steps. (water.phila.gov)

Frequently asked questions

Can I use a torch, propane heater, or open flame to thaw a frozen pipe?

No. EPA says not to thaw frozen pipes with a torch, and local governments such as Chesterfield and Independence give the same warning. Use slow, even warming methods instead, or call a plumber if the frozen section is not easy to reach safely. (epa.gov)

Should I let a faucet drip during very cold weather?

Sometimes, yes, but usually only when your home has a history of freezing or your utility tells you to do it. Philadelphia says to consider it when temperatures are forecast below 32°F for two days or more, while Chesterfield points to below 20°F, and Minneapolis says a pencil-width stream may need to continue until the ground thaws in problem locations. That is a good example of why local instructions matter. (water.phila.gov)

Who is responsible if the frozen line is between the street and my house?

It depends on the local system. In Minneapolis, the owner is responsible from the water main to the meter. In Chesterfield, the utility handles leaks in the meter box and on the street side of it, while the customer handles the service line to the house. Philadelphia says private pipes are not the department's responsibility, even when they are outside the house. (minneapolismn.gov)

What if the line thaws and now I have a leak or a high bill?

Shut off the water with the house-side valve if you can do so safely, then call a plumber. Philadelphia says damaged pipes need repair, and Minneapolis says a damaged meter may leak as it thaws. Chesterfield also notes that some utilities have leak-adjustment processes for customer-side leaks, but the rules and deadlines are local, so ask right away. (water.phila.gov)