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Plumbing in Mackinac Island: winter lows around 10°F mean exposed pipes can freeze and burst.
In Mackinac County, July highs average about 76°F and January lows about 10°F, with roughly 34 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 and damaging thunderstorm winds in Mackinac County, with hail up to 1.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Mackinac County has had 4 federal disaster declarations in the last 25 years, most often for public-health emergencies; 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 Mackinac County figures — more about homes in St. Ignace.
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