Preventing frozen pipes comes down to three things. Keep water out of pipes that sit outside the heated part of your building. Keep heat reaching the ones that stay in use. And make sure the heating itself will not fail in January. Most winter damage in this region traces back to one of those three being missed.
Why This Matters to Homeowners
A burst pipe is the most expensive common plumbing failure a homeowner faces, and it is almost entirely preventable. That combination is unusual. Most large repair bills follow from wear you could not reasonably have seen. This one follows from an afternoon of preparation that did not happen.
Eastern South Dakota gives you no margin here. January lows sit well below zero, and they stay there. An unheated building can reach pipe-bursting temperature inside a day, which means a heating failure while you are away is not an inconvenience you come home to, it is a flooded building.
The damage you only find in April
There is a second, quieter cost. A great many splits are not discovered in winter at all. The pipe freezes, cracks, and stays frozen, so nothing leaks. The damage appears in April when the water goes back on and the ice melts. By then the cause is months old and the water has somewhere to go.
That delay is why seasonal and lake property features heavily in spring call-outs around Lake County. The building was closed up correctly in most respects, one line held water, and nobody knew until the thaw.
The damage you only find in April
The preparation below takes an afternoon. It is the highest-return maintenance available to a homeowner in this climate.
Why Pipes Actually Burst
This is worth understanding properly, because the common explanation is wrong and it leads people to protect the wrong thing.
Water expands as it freezes. That much is true. But a pipe does not usually split at the point where the ice forms. It splits somewhere else, often a considerable distance away, and knowing why changes what you do about it.
What actually happens inside the pipe
When ice forms in a section of pipe, it does not fill the pipe evenly. It creates a plug. Water on the far side of that plug, between the ice and a closed tap, is now sealed in. As the plug continues to grow, it pushes that trapped water along with nowhere for it to go.
Pressure in that trapped section rises enormously. Pipe is strong but not unlimited, and eventually the weakest point in that sealed length gives way. That point is frequently downstream of the ice, near a fitting or a joint, in a part of the pipe that never froze at all.
What actually happens inside the pipe
Two practical conclusions follow. First, insulating one cold spot may simply move the problem rather than solve it, because the trapped-water mechanism needs somewhere for pressure to escape. Second, leaving a tap dripping during a hard freeze genuinely works, and not for the reason most people assume. It is not that moving water cannot freeze. It is that an open tap gives the trapped water an escape route, so pressure never builds.
That is also why draining a system properly is so much more reliable than insulating it. A pipe with no water in it cannot burst, regardless of how cold it gets.
What actually happens inside the pipe
The Pipes Most at Risk in a South Dakota Home
Risk is not evenly distributed. These are the locations that account for most failures, roughly in order.
- Outside taps and hose bibs. The single most common failure. A hose left connected keeps water sitting in the tap body and in the pipe behind it, where it freezes readily. Even frost-free hydrants fail if they cannot drain, which they cannot with a hose attached.
- Unheated crawl spaces. Pipe here is inside the building envelope in a technical sense but outside the heated space in every way that matters. Warm rooms above do not help a pipe in the cold air below the floor.
- Uninsulated exterior walls. Supply lines run through outside walls are exposed to whatever the wall cavity temperature is, which in a cold snap can be well below freezing even in a well-heated house.
- Garages and attached outbuildings. Frequently unheated, and frequently containing a laundry connection, a utility sink or a line running through to elsewhere.
- Attics. Less common here than in warmer climates, but where pipe does run through an attic it is thoroughly exposed.
- Long service runs to outbuildings. On acreages and farm sites, a line run too shallow or through an unheated space will freeze regardless of how much it is used.
The general rule is simple enough: any pipe that is not inside the heated part of the building is at risk, and being inside the walls does not count as inside the heated part.
What to Do Before the First Hard Freeze
This is the autumn checklist. None of it is difficult and most of it is free.
- Disconnect every hose. Then open the outside taps to let them drain fully, and close them again. This one action prevents a large share of all winter damage.
- Shut off the supply to outside taps at the interior valve if your house has one, then open the outside tap to drain the section between them.
- Insulate exposed pipe in crawl spaces, garages and unheated areas. Foam sleeve is inexpensive and takes minutes per run.
- Find and test your main shut-off valve. Confirm it actually turns. A seized valve discovered during an emergency is a bad surprise.
- Seal draughts near pipe runs. A gap letting cold air directly onto a pipe matters more than the overall room temperature.
- Book heating service. A furnace that fails in a cold snap turns every pipe in the house into a risk at once.
That last item is the one people skip, and it is arguably the most important. Every other measure on this list assumes your heating keeps working. Servicing before the season means a worn igniter or a blocked flue is found while a part can still be ordered without you waiting in sub-zero weather.
If you are going to be away during winter, do not set the thermostat off. Set it low but well above freezing, and ask someone to check the building. A house that loses heat while empty for a week is the worst case of all.
Protecting Lake Property and Seasonal Buildings
Seasonal property needs a different approach, because you are not keeping it warm, you are making sure there is nothing in it to freeze.
Draining properly means more than closing the main valve. Water sits in places people forget, and any one of them is enough.
Work through the whole system
Work through the whole system: the water heater, every tap including outside ones, the toilet tanks and bowls, any washing machine or dishwasher supply lines, and the trap under each drain. Traps need antifreeze rather than draining, because they are designed to hold water and a dry trap lets sewer gas into the building.
The water heater deserves particular attention. Drain it fully rather than part way, and turn off the power or gas before you do. A tank left with water in it over a freeze can split, and that is an expensive discovery in spring.
Work through the whole system
One thing we see repeatedly around Lake Madison and the Lake County shoreline: a cabin drained by different people in different years, with a slightly different routine each time. Over several seasons that produces a system where nobody is quite sure what gets missed.
It is worth having the whole thing gone through properly once, so you know exactly which points need draining and in what order. After that it is a checklist rather than a memory exercise.
Work through the whole system
Converted cabins are a particular case. A building taken from seasonal to year-round use often has heating added without the water lines being moved, so pipe still runs through unheated crawl spaces. Warm rooms will not save it.
Farm Buildings, Outbuildings and Long Service Runs
Rural property has failure modes a town house does not, and they need designing around rather than patching.
Frost depth governs everything. A supply line has to be laid deep enough to stay below the frost, insulated, heat-taped, or built so it can be drained seasonally. A line that is none of those will freeze eventually, whatever its usage pattern.
Frost-free hydrants that keep freezing
Frost-free hydrants are the most common rural complaint we hear, and the diagnosis is nearly always the same. A frost-free hydrant works by draining its riser below the frost line after each use. If the drain hole is blocked, or the ground around it has become saturated and cannot accept the water, the riser stays full and freezes. The hydrant is not faulty, it is not draining.
Part-time heated buildings are the other recurring problem. A shop heated only when someone is working in it starts every cycle from cold, so it needs more capacity than the square footage suggests. Equipment sized for a continuously heated space will not keep up, and when it cannot, any plumbing in that building is exposed.
Frost-free hydrants that keep freezing
Long runs to outbuildings combine both problems: distance, shallow burial, and a destination that may not be heated. These are worth solving at the design stage rather than after the first failure.
What Prevention Costs Versus Repair
The economics here are unusually clear.
Prevention is a few hours of your time, some foam pipe sleeve, and an annual heating service. Most of the checklist above costs nothing but attention.
What a repair actually costs
Repair is different in kind. A burst pipe is rarely just a pipe. Water escaping under pressure into a wall cavity or across a floor brings drywall, insulation, flooring and sometimes cabinetry with it. Then there is drying, and if it went unnoticed, mould remediation.
The pipe itself is often the smallest line on that invoice. The building work around it is the expensive part, and none of it would have been necessary had the pipe not split.
What a repair actually costs
Insurance may cover sudden water damage, though policies vary considerably on damage resulting from inadequate heating or an unoccupied property. It is worth reading your own policy on that specific point rather than assuming, particularly for seasonal property.
The one genuine cost worth planning for is fixing structural exposure: rerouting a line out of a crawl space, laying a rural run deeper, or insulating properly. Those are real jobs with real prices, but they are one-time fixes to a recurring risk.
What a repair actually costs
When to Call a Professional
Homeowners can and should handle the autumn checklist. Disconnecting hoses, draining outside taps, fitting foam sleeve and testing the main valve are all straightforward.
Call a licensed professional when:
- A pipe has already frozen and you cannot locate or safely thaw it
- A pipe has split, or you suspect it has
- Your main shut-off valve will not turn or will not seal
- Pipe needs rerouting out of an unheated space
- A rural service run needs laying deeper or draining seasonally
- Heating needs servicing before the season, or has already failed
- A seasonal property needs a proper drain-down or spring start-up
Never thaw a pipe with an open flame. It is a fire risk, it can damage the pipe, and rapid uneven heating can cause the very split you are trying to avoid. Gentle warmth from a hair dryer or a heat lamp, working from the tap end back toward the frozen section, is the safe method.
If a pipe has frozen and you are not certain it has not already cracked, shut the water off before thawing it. A split pipe reveals itself the moment the ice melts, and you want the supply closed when that happens.
Related reading
You can read more on our plumbing repairs in Sioux Falls page, and on heating and HVAC in Sioux Falls for the servicing side.
Need a Plumber in Sioux Falls? Gold Standard Plumbing & Heating Is Ready to Help
Winter preparation is the cheapest plumbing work you will ever pay for, and the best time to do it is before the first hard freeze rather than after it. Gold Standard Plumbing & Heating is locally owned, licensed, bonded and insured, covering Sioux Falls, Brookings and the towns along the I-29 corridor.
Call us at (605) 530-6950 or contact us today to schedule service in Sioux Falls and surrounding areas. If a pipe has already burst, please call rather than email.