Grant County, West Virginia · Petersburg
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Grant County averages 35 nights a year at 20°F or colder, mostly November to March, and 22% of its homes predate 1960.
September brings the most downpours to Grant County, part of 5.5 heavy-rain days a year. Check the sump first.
Backups often follow heavy rain, which Grant County gets about 5.5 days a year, when storm water overloads sewer mains and pushes up through the lowest drain in the house.
In Grant County, 2.59 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
31% of occupied homes in Grant County heat mainly with wood or propane, above the West Virginia county median of 10.1%.
About 8 nights a year here stay at 65°F or warmer, so basements and crawl spaces can grow mold even without a leak.
Local risk profile
About 10,983 people live in Grant County, 477 square miles in eastern West Virginia, in roughly 5,670 homes. The county seat is Petersburg, and Bayard is the other large town. Half the homes here were built before 1980, half after.
37/100 Water Damage Risk Index: Moderate Grant County ranks 44 of 55 West Virginia counties. See the statewide ranking and method.The three factors where Grant County ranks highest compared with other West Virginia counties.
Grant County gets more hard-freeze nights than most of West Virginia. In the 2015–2024 record the county logged about 35 nights a year at or below 20°F (6th of 55) and 118 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
Cold snaps are the real risk. The worst in the record lasted 14 days below freezing (ending January 2018), and the low bottomed out near -8°F on January 7, 2018.
Expect the hardest freezes in January, inside a season that runs November to March. That's when an outdoor spigot left connected to a hose, or a pipe in a crawl space, is most likely to split.
Freezing nights typically start around Oct 20 and end around Apr 29.
Grant gets fewer downpours than most West Virginia counties, but they still fill basements. The county gets about 41 inches of rain and melted snow a year, with 5.5 days of an inch or more (49th of 55). Those downpours cluster in April, June and September, when sump pumps and gutters are tested hardest. The wettest day on record brought 2.59 inches on August 9, 2024. The worst three-day stretch dropped 4.04 inches, ending September 10, 2018, the kind of soaking that overwhelms sump pumps and storm sewers.
About 103 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
50% of homes in Grant County predate 1980, below the West Virginia county median of 55.1%, which ranks 39th of West Virginia's 55 counties.
21% of homes were built in 2000 or later, more than in most of West Virginia. Newer plumbing rarely corrodes, so damage here tends to come from appliance supply lines, water heaters, sump pumps and storms.
The 1980s and 1990s account for 29% 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.
15% of homes are manufactured or mobile homes, close to 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 23% 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
About 8 nights a year in Grant County stay at 65°F or warmer, a sign of muggy summer air (48th of 55 counties). May is the wettest month. The EPA recommends keeping indoor humidity below 60%, ideally 30 to 50%. Basements can pass 60% on their own in summer, so a dehumidifier matters even without a leak, and anything wet should be dried within 24 to 48 hours.
Mold remediation: what to expectMain heating fuel in Grant County's occupied homes: 4% utility gas, 54% electric, 11% propane and 19% wood. Wood and propane heat are more common here than the state median. Have chimneys swept and fuel-burning appliances serviced each fall, and keep three feet clear around stoves and space heaters.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Grant County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Pendleton and Tucker get more pipe-freeze nights than Grant. Mineral County has the oldest housing nearby, with 56% of homes built before 1980.
By the numbers
| Factor | Grant | West Virginia median | Rank |
|---|---|---|---|
| Homes built before 1960 | 22% | 31% | 44 of 55 |
| Homes built before 1980 | 50% | 55% | 39 of 55 |
| Homes built 2000 or later | 21% | 17% | 14 of 55 |
| Manufactured or mobile homes | 15% | 16% | 30 of 55 |
| Vacant homes | 23% | 17% | 15 of 55 |
| Wood or propane heat | 31% | 10% | 8 of 55 |
| Nights at 20°F or colder | 35/yr | 25/yr | 6 of 55 |
| Days with 1 inch+ of rain | 5.5/yr | 6.8/yr | 49 of 55 |
| Freeze-thaw days | 103/yr | 89/yr | 2 of 55 |
| Muggy nights (65°F+) | 8/yr | 27/yr | 48 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 Grant County: freezing from November to March, heavy rain in April, June and September.
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