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Plumbing in Mattawa: winter lows around 24°F mean exposed pipes can freeze and burst; flash floods here can back up drains.
In Grant County, July highs average about 89°F and January lows about 24°F, with roughly 8 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 flash floods, floods and damaging thunderstorm winds in Grant County. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Grant County has had 9 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Baird Springs Fire (2023).
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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 Grant County figures — more about homes in Moses Lake.
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