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Plumbing in Smithfield: winter lows around 32°F mean exposed pipes can freeze and burst; 19% of homes in Johnston County were built before 1980, when galvanized and older pipes were common; flash floods here can back up drains.
In Johnston County, July highs average about 90°F and January lows about 32°F, with roughly 49 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, flash floods and hailstorms in Johnston County, with hail up to 1.25 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Johnston County was built around 2005, about 21 years ago, and 19% were built before 1980.
Johnston County has had 19 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Severe Winter Storm (2026).
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Insulate pipes in crawl spaces and outside walls, drip faucets on the coldest nights, and know where your main shut-off is.
Galvanized steel and polybutylene pipes are past their life in most homes — low pressure, rusty water or repeated leaks are the signs.
Yes if water is spreading or near electrics — turn off the main and choose Emergency when you book; we call you at the first opening.
These are Johnston County figures — more about homes in Clayton.
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