Calhoun County, West Virginia · Grantsville
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Pipes freeze in Calhoun County on about 24 nights a year, mostly November to March. Older homes, 35% of the stock here, are most at risk.
Basements flood here mostly in June. Calhoun County averages 6.7 days a year with an inch of rain or more.
Sewage backups in Calhoun County spike on heavy-rain days, about 6.7 a year, when sewer mains fill up and water finds the lowest drain.
Roof leaks here come from summer downpours and, with about 89 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
5% of occupied homes in Calhoun County heat mainly with wood or propane, below the West Virginia county median of 10.1%.
Muggy summer nights, lows of 65°F or more, come about 32 times a year in Calhoun County. Mold after a leak spreads fastest from June through August.
Local risk profile
With 3,185 homes and around 6,048 residents, Calhoun County is 279 square miles of western West Virginia. Grantsville is the county seat. Half the homes here were built before 1975, half after.
52/100 Water Damage Risk Index: Elevated Calhoun County ranks 24 of 55 West Virginia counties. See the statewide ranking and method.The three factors where Calhoun County ranks highest compared with other West Virginia counties.
Pipe-freeze risk in Calhoun County sits near the middle of the state. In the 2015–2024 record the county logged about 24 nights a year at or below 20°F (31st of 55) and 101 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
Cold snaps are the real risk. The worst in the record lasted 13 days below freezing (ending January 2018), and the low bottomed out near -12°F on February 20, 2015.
Most freezing nights fall from November to March, peaking in January. Disconnect garden hoses and shut off outdoor spigots before the first hard frost, and keep the heat at 55°F or higher if you'll be away.
Freezing nights typically start around Nov 2 and end around Apr 22.
Rainfall is about average for West Virginia. About 6.7 days a year bring an inch or more (29th of 55), most often in June, out of 46.4 inches of total precipitation. On July 31, 2020, 3.39 inches fell in a single day. The worst three-day stretch dropped 4.14 inches, ending August 2, 2020, the kind of soaking that overwhelms sump pumps and storm sewers.
About 89 days a year swing from below freezing at night to above freezing by day. Those freeze-thaw cycles feed ice dams on roofs, open cracks in foundations and driveways, and stress pipes that are already marginal.
Housing
59% of homes in Calhoun County predate 1980, close to the West Virginia county median of 55.1%, which ranks 19th of West Virginia's 55 counties.
In Calhoun County 35% of homes are older than 1960. If yours is one of them and the plumbing has never been replaced, expect galvanized steel supply pipe and cast iron drain lines, the two materials most likely to fail quietly.
The 1980s and 1990s account for 25% of the county's homes. If yours is from those decades, look under the sinks and at the water heater for gray plastic pipe stamped PB, which is polybutylene and leak-prone.
25% of homes are manufactured or mobile homes, above the West Virginia county median of 16.2%. Their water lines run under the floor behind the skirting, so a torn skirt or failed heat tape freezes them faster than lines in a site-built house.
The Census counted 21% of homes as vacant, above the West Virginia county median of 17.4%. Empty houses are where a small leak turns into a large claim, because nobody is there to hear it.
Beyond water
Calhoun County averages 32 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in June. Keep indoor humidity under 60%, as the EPA advises, and dry any leak within 24 to 48 hours; in a humid month a wet basement left alone won't dry by itself.
Mold remediation: what to expectHeating fuel matters for fire risk. In Calhoun County it's 75% utility gas, 19% electric, 3% propane and 2% wood. Heating equipment, cooking and electrical failures cause most home fires nationally. Even a small kitchen fire can leave soot through the whole house, because smoke follows air currents into closets, ducts and attic space.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Calhoun County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Wirt gets more pipe-freeze nights than Calhoun. Gilmer County has the oldest housing nearby, with 62% of homes built before 1980.
By the numbers
| Factor | Calhoun | West Virginia median | Rank |
|---|---|---|---|
| Homes built before 1960 | 35% | 31% | 18 of 55 |
| Homes built before 1980 | 59% | 55% | 19 of 55 |
| Homes built 2000 or later | 17% | 17% | 28 of 55 |
| Manufactured or mobile homes | 25% | 16% | 10 of 55 |
| Vacant homes | 21% | 17% | 18 of 55 |
| Wood or propane heat | 4.9% | 10% | 44 of 55 |
| Nights at 20°F or colder | 24/yr | 25/yr | 31 of 55 |
| Days with 1 inch+ of rain | 6.7/yr | 6.8/yr | 29 of 55 |
| Freeze-thaw days | 89/yr | 89/yr | 25 of 55 |
| Muggy nights (65°F+) | 32/yr | 27/yr | 20 of 55 |
Rank 1 is the highest value. Bars run from the lowest to the highest West Virginia county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Calhoun County: freezing from November to March, heavy rain in May, June and October.
Sources: U.S. Census Bureau, ACS 2024 5-year estimates (2020-2024); weather from NOAA nClimGrid-Daily county averages (EpiNOAA), 2015–2024, averaged across the county; county boundaries from Census TIGER. Reviewed 2026-10-21. Methodology