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Plumbing in Leonardtown: winter lows around 27°F mean exposed pipes can freeze and burst; 34% of homes in St. Mary's County were built before 1980, when galvanized and older pipes were common; flash floods here can back up drains.
In St. Mary's County, July highs average about 88°F and January lows about 27°F, with roughly 45 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, floods and flash floods in St. Mary's 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.
The typical home in St. Mary's County was built around 1990, about 36 years ago, and 34% were built before 1980.
St. Mary's County has had 12 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Severe Winter Storm (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.
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