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Plumbing in Castana: winter lows around 11°F mean exposed pipes can freeze and burst; flash floods here can back up drains.
In Monona County, July highs average about 85°F and January lows about 11°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 floods in Monona County, with hail up to 3.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Monona County has had 14 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Winter Storm (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 Monona County figures — more about homes in Onawa.
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