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Plumbing in Keystone: winter lows around 12°F mean exposed pipes can freeze and burst; flash floods here can back up drains.
In Pennington County, July highs average about 85°F and January lows about 12°F, with roughly 19 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 Pennington County, with hail up to 4.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Pennington County has had 13 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Straight-Line Winds (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 Pennington County figures — more about homes in Rapid City.
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