Water expands as it freezes, and that expansion puts pressure on the inside of a pipe. In cold weather, pipes running through unheated spaces — like exterior walls, attics, basements, or crawl spaces — are most at risk.
Pipes weaken over time, particularly older galvanized steel or certain older copper installations. As material corrodes or thins, it becomes more likely to fail under normal water pressure.
Consistently high water pressure puts ongoing strain on pipes and fittings. Over time, this added stress can contribute to a failure at a weak point in the system, such as a joint or fitting.
For underground or slab-run pipes, shifting soil, nearby construction, or tree root intrusion can put pressure on a pipe until it fails.
A full burst is often preceded by smaller signs: discolored water, banging or knocking sounds in the pipes, a noticeable drop in water pressure, or a small, persistent drip. Catching these early can sometimes mean the difference between a routine repair and an emergency.
Shut off your main water supply valve immediately to limit water damage, then request a connection with a local provider as soon as possible. Knowing where your main shutoff valve is located before an emergency happens can save valuable time.
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PlumbRoute is a referral service, not a plumbing contractor.