Quick AnswerSigns your pipes are frozen: no water or only a trickle from a faucet in cold weather, frost or condensation on an exposed pipe, a bulging or cracked section, and strange gurgling or banging when you turn on a tap. The most vulnerable pipes run through unheated spaces - basements, crawl spaces, garages, and exterior walls.
The classic tell is a faucet that will not flow on a very cold morning while others work fine - that isolates the freeze to the line serving that fixture. Frost on a visible pipe or a section that looks slightly swollen confirms it.
Speed matters because a frozen pipe is a burst pipe waiting to happen. Water expands as it freezes, and the pressure between the ice and a closed faucet is what splits the pipe, so acting before it thaws can prevent a flood.
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