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Plumbing in Jansen: winter lows around 16°F mean exposed pipes can freeze and burst; 82% of homes in Jefferson County were built before 1980, when galvanized and older pipes were common; flash floods here can back up drains.
In Jefferson County, July highs average about 89°F and January lows about 16°F, with roughly 31 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 hailstorms, damaging thunderstorm winds and flash floods in Jefferson County, with hail up to 2.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Jefferson County was built around 1928, about 98 years ago, and 82% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Jefferson County has had 18 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Storms, Straight-Line Winds, Tornadoes, And Flooding (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 Jefferson County figures — more about homes in Fairbury.
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