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Plumbing in Herculaneum: winter lows around 23°F mean exposed pipes can freeze and burst; flash floods here can back up drains.
In Jefferson County, July highs average about 89°F and January lows about 23°F, with roughly 44 inches of rain a year.
Over the last 10 years the National Weather Service recorded hailstorms, damaging thunderstorm winds and flash floods in Jefferson County, with hail up to 3 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Jefferson County has had 20 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Storms, Straight-Line Winds, Tornadoes, And Wildfires (2025).
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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 Arnold.
Pevely · Crystal City · Festus · Kimmswick · Olympian Village · Hillsboro · Arnold · De Soto