A frozen pipe can leave a home without running water. A damaged pipe can leave that same home with water running where it shouldn’t.
As Hamilton heads toward another winter, it’s worth understanding how quickly one problem can become the other.
The City of Hamilton has published guidance to help residents protect their plumbing from freezing temperatures. Its advice covers exposed pipes, outdoor taps, air leaks and what to do when a water line freezes.
For homeowners and property managers, there’s another part of the story worth understanding: what happens when a frozen pipe is damaged and water begins flowing again.
Why a frozen pipe can become a water-damage problem
Water expands as it freezes. Inside a pipe, ice formation can create enough pressure to damage the plumbing.
The damage isn’t always immediately obvious.
A pipe may freeze and interrupt the water supply without producing a visible leak. If it has cracked or split, water may escape when the ice melts and flow resumes.
Depending on where the damaged pipe is located, water can spread into walls, ceilings, flooring and insulation before anyone notices.
This is especially concerning in spaces that aren’t regularly occupied or inspected, including storage rooms, vacant units and seldom-used areas of a building.
What Hamilton is telling residents to check
The City’s frozen-pipe guidance identifies several practical precautions:
- Seal air leaks. Cold air entering through gaps around a home or garage can expose nearby plumbing to freezing temperatures.
- Protect exposed pipes. Pipe insulation and appropriate protective measures can help reduce freezing risks in unheated basements, crawl spaces, cold cellars, attics and garages.
- Disconnect outdoor hoses. Drain hoses, shut off outdoor water supplies where applicable, and empty exterior taps before freezing weather.
- Know where the main shut-off valve is. If a pipe bursts, being able to stop the water supply promptly can limit further damage.
The City also recommends shutting off the home’s water supply when leaving for an extended period during winter.
These are relatively straightforward precautions, but they address areas that are easy to overlook until temperatures fall.
If a pipe freezes, who is responsible?
In Hamilton, responsibility for the water service line is divided at the property line.
The City is responsible for the section between the property line and the municipal water main. Building owners are responsible for the section from the property line to and inside their buildings.
Knowing where the frozen section is located helps determine who should address it.
For frozen pipes on the owner’s side, the City’s guidance recommends hiring a qualified contractor. Residents should avoid using open flames or unsafe heating methods to thaw pipes.
If a frozen pipe has already burst, the immediate priority is to shut off the water supply, provided it is safe to do so.
When the plumbing is fixed, the water damage may remain
Repairing a damaged pipe stops the source of the leak, but it doesn’t necessarily resolve the damage left behind.
Water can move beyond the visible area, entering wall cavities, travelling beneath flooring or soaking insulation. The amount of water seen on the surface may not reflect the full extent of the affected materials.
That is where moisture assessment, documentation and appropriate drying become important.
A plumber repairs the source of the leak. Restoration professionals assess and address the resulting water damage.
Both have a role in getting the property back to its pre-loss condition.
The one thing to remember
Hamilton’s frozen-pipe guidance is worth reviewing before prolonged freezing temperatures arrive.
Knowing which pipes are vulnerable, protecting them from cold air and locating the main water shut-off valve can make a meaningful difference.
A frozen pipe is a plumbing problem. A burst pipe can quickly become a building-wide water-damage problem.
Sources and further information
- City of Hamilton. Frozen Pipes: Prevention and What to Do if Pipes Freeze, updated September 3, 2026.
- City of Hamilton. Winter Safety: Staying Prepared During the Cold Months, December 23, 2025.
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