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Plumbing in Mountain Iron: winter lows around -3°F mean exposed pipes can freeze and burst; 70% of homes in St. Louis County were built before 1980, when galvanized and older pipes were common; flash floods here can back up drains.
In St. Louis County, July highs average about 78°F and January lows about -3°F, with roughly 28 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 St. Louis 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.
The typical home in St. Louis County was built around 1958, about 68 years ago, and 70% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
St. Louis County has had 10 federal disaster declarations in the last 25 years, most often for floods; the latest was Munger Shaw Fire (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 St. Louis County figures — more about homes in Duluth.
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