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Plumbing in Hannibal: winter lows around 14°F mean exposed pipes can freeze and burst; 64% of homes in Oswego County were built before 1980, when galvanized and older pipes were common; flash floods here can back up drains.
In Oswego County, July highs average about 80°F and January lows about 14°F, with roughly 46 inches of rain a year. Long, cold winters put furnaces and pipes to the test.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, hailstorms and flash floods in Oswego County, with hail up to 2.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Oswego County was built around 1965, about 61 years ago, and 64% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Oswego County has had 13 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Storm And Flooding (2024).
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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 Oswego County figures — more about homes in Oswego.
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