A hard freeze rarely gives a plumbing system much warning. One day, a drafty cabinet is harmless. The next, a pipe along an exterior wall has frozen, the well pump is struggling, or water is showing up where it should not. This end-of-december plumbing checklist helps homeowners catch small concerns before the coldest stretch of winter puts added pressure on pipes, pumps, drains, and water equipment.
December is also a practical time to inspect the systems that get overlooked during holiday plans and winter travel. A few careful checks can reduce the chance of returning to a cold home, a flooded basement, or no running water.
Your end-of-December plumbing checklist
Check for slow leaks before they become freeze problems
Walk through kitchens, bathrooms, laundry areas, utility rooms, and mechanical spaces with a flashlight. Look under sinks, around toilets, behind washing machines, and at visible pipe connections for moisture, staining, corrosion, or a musty smell. A small leak may seem manageable in mild weather, but water around cold piping can speed up freezing and create a larger repair when temperatures fall.
Pay attention to toilets that run intermittently and faucets that drip. A dripping faucet does not always prevent a pipe from freezing, especially if the line is exposed to severe cold, but it is still a sign that a repair may be needed. If you notice unexplained water use, check your water meter when no fixtures are running. Movement at the meter can point to a hidden leak.
Protect pipes in cold or unheated areas
Pipes in crawl spaces, garages, unfinished basements, exterior walls, and under kitchen or bathroom cabinets are most vulnerable to freezing. Check that pipe insulation is secure and dry. Insulation helps slow heat loss, but it cannot correct a major draft or a space that is not receiving enough heat.
Keep garage doors closed whenever possible, particularly if plumbing lines run through or beside the garage. On very cold nights, open cabinet doors under sinks located on exterior walls so warmer household air can circulate around the pipes. Do not use open flames, torches, or unapproved heaters to warm plumbing areas. Those methods can create a fire hazard and may damage pipes, wiring, or finishes.
If a pipe has frozen but has not burst, turn off the water supply to that section if you can do so safely and arrange for professional help. A frozen pipe can crack before it thaws, so the problem is not necessarily over once water begins flowing again.
Test your sump pump and inspect the discharge line
A sump pump may not run often in late December, but it needs to be ready for a midwinter thaw, rain event, or snowmelt. Lift the pump float carefully or pour water into the pit until the pump cycles. Confirm that it starts, moves water, and shuts off properly. Listen for straining, rattling, or repeated cycling.
Outside, make sure the discharge line is directing water away from the foundation and is not blocked by ice, leaves, snow, or debris. A frozen discharge line can cause water to back up into the pit just when the pump is needed most. If your system has a backup pump or battery backup, check its status indicator and confirm the backup is maintained according to the manufacturer’s instructions.
A sump pump that runs continuously, fails to turn on, or leaves water in the pit should be inspected promptly. Basement water problems can affect electrical equipment, stored belongings, drywall, and flooring within a short time.
Give your well system a quick health check
For homes with well water, the pressure tank, pressure switch, pump controls, and water treatment equipment all deserve attention before extended cold weather. Notice whether water pressure has changed, faucets are sputtering, or the pump seems to cycle more frequently than usual. These symptoms can point to a pressure tank issue, a leak, a clogged filter, or a pump problem.
Make sure the area around the pressure tank and plumbing equipment stays above freezing. If the equipment is in a basement, pump house, or utility space with limited heat, confirm that doors, windows, and vents are properly closed and that heat is reaching the room.
Check filters and water softeners as well. A filter that is overdue for replacement can reduce water flow, while a softener that is low on salt may not protect fixtures and plumbing equipment as intended. If your household has experienced low pressure, no water, or unusual pump cycling, do not wait for a full system failure during a cold spell.
Look over water heaters and mechanical room drains
Your water heater works harder during winter, when incoming water is colder and household demand often rises. Check around the tank or tankless unit for moisture, rust, loose venting, or signs of corrosion. Confirm that the area is clear of stored materials and that the shutoff valve is accessible.
Do not test a temperature-and-pressure relief valve unless you are familiar with the procedure and know where the discharge pipe terminates. If the valve is leaking, the tank is making unusual noises, or hot water has become unreliable, have the unit assessed. Water heater problems can involve plumbing, venting, gas connections, or electrical components, depending on the equipment.
Also check floor drains in basements, laundry rooms, and mechanical rooms. Pour water into drains that are rarely used to restore the trap seal. A dry trap can allow sewer odors into the home. If a floor drain is slow, backs up, or has a persistent odor after water is added, it may need cleaning or further investigation.
Prepare plumbing before leaving town
Many winter plumbing emergencies happen while a house is empty. If you are away for a weekend or longer, keep the home heated rather than turning the thermostat down too far. The appropriate setting depends on the home, insulation, and where pipes are located, but the goal is to maintain enough indoor heat to protect vulnerable plumbing.
Ask a trusted person to check the property during extended absences, especially after severe weather or a power outage. They should know where the main water shutoff is located and how to contact help if they find a leak or loss of heat. If you plan to shut off the main water supply, understand what equipment may be affected, including water heaters, boilers, well systems, and irrigation connections.
For properties with a history of frozen pipes, vacant units, seasonal buildings, or plumbing in unheated areas, a more complete winterization plan may be the safer choice. This is not a one-size-fits-all decision. A home served by a well, a hydronic heating system, or a sump pump may require specific steps to avoid creating a different problem.
Know the warning signs that should not wait
Some plumbing concerns are best handled before the calendar turns. Call for service if you have no water, a burst or suspected frozen pipe, sewage backup, a failed sump pump, water around a water heater, repeated drain backups, or a well pump that will not maintain pressure. Shut off the main water supply when there is an active leak that cannot be contained, provided it is safe to access the valve.
For a suspected frozen pipe, keep the affected faucet open, avoid using electrical appliances near standing water, and do not attempt to thaw inaccessible piping inside walls with improvised heat sources. The visible section may not be the only frozen area, and thawing can reveal a split pipe.
A practical winter habit for Eastern Ontario homes
In Brockville, Kemptville, Prescott, and surrounding Eastern Ontario communities, winter conditions can shift quickly from manageable cold to prolonged freezing temperatures. The best approach is not to wait until a pipe stops flowing. Check the areas you can see, keep mechanical spaces accessible, and address warning signs while repair options are still straightforward.
If your home has connected plumbing, heating, electrical, well, or sump pump concerns, SDR Electric, Plumbing & Heating can help assess the issue as part of the larger property system. A careful inspection now can make the coldest weeks of winter far less stressful.
