Mercer County, West Virginia · Princeton
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With 32% of homes built before 1960 and about 28 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
Heavy rain days of an inch or more come about 6.4 times a year here, most often in April. A sump pump that hasn't run since last season is a common weak point.
Backups often follow heavy rain, which Mercer County gets about 6.4 days a year, when storm water overloads sewer mains and pushes up through the lowest drain in the house.
In Mercer County, 2.56 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
9% of occupied homes in Mercer County heat mainly with wood or propane, below 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
With 29,345 homes and around 58,563 residents, Mercer County is 419 square miles of southwest West Virginia. Princeton is the county seat; Bluefield, Bluewell and Athens are the next largest communities. Half the homes here were built before 1974, half after.
47/100 Water Damage Risk Index: Elevated Mercer County ranks 33 of 55 West Virginia counties. See the statewide ranking and method.The three factors where Mercer County ranks highest compared with other West Virginia counties.
Mercer County gets more hard-freeze nights than most of West Virginia. In the 2015–2024 record the county logged about 28 nights a year at or below 20°F (14th of 55) and 107 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 -9°F on February 21, 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 Oct 20 and end around Apr 22.
Mercer gets fewer downpours than most West Virginia counties, but they still fill basements. Of roughly 44.4 inches of yearly precipitation, the damage comes from the 6.4 days a year with an inch or more, ranked 40th of 55. February, April and May see the most. The single wettest day in the record: 2.56 inches, September 26, 2024. The worst three-day stretch dropped 5.1 inches, ending September 28, 2024, the kind of soaking that overwhelms sump pumps and storm sewers.
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 94 times a year here. They're the main driver of ice dams and of water working its way through foundation cracks in late winter.
Housing
60% of homes in Mercer County predate 1980, above the West Virginia county median of 55.1%, which ranks 17th of West Virginia's 55 counties.
Housing age is mixed: 32% of homes are pre-1960 and 15% are 2000 or newer. Ask any plumber which era your house is from and you'll know which failures to watch for.
25% date from 1980 to 1999, the window when polybutylene, a gray flexible plastic supply pipe, was used in some homes. It's prone to leaks at the fittings, so it's worth checking for in a house from those years.
Manufactured and mobile homes make up 20% of the housing here. Water lines in the underbelly depend on intact skirting and working heat tape, and they're usually the first to freeze in a cold snap.
Beyond water
Summer nights that don't drop below 65°F, a good marker of humid air, come about 8 times a year here, below the West Virginia county median of 27. 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 expectBy main heating fuel, Mercer County homes break down as 21% utility gas, 67% electric, 4% propane and 5% wood. Fires here are likelier to start in the kitchen or the wiring than in the furnace. After any fire, keep the HVAC off until ducts are checked, or soot will travel through the house.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Mercer County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Mercer gets more pipe-freeze nights than any of its neighbors. All of its neighbors see more heavy-rain days. McDowell County has the oldest housing nearby, with 76% of homes built before 1980.
By the numbers
| Factor | Mercer | West Virginia median | Rank |
|---|---|---|---|
| Homes built before 1960 | 32% | 31% | 24 of 55 |
| Homes built before 1980 | 60% | 55% | 17 of 55 |
| Homes built 2000 or later | 15% | 17% | 42 of 55 |
| Manufactured or mobile homes | 20% | 16% | 20 of 55 |
| Vacant homes | 18% | 17% | 27 of 55 |
| Wood or propane heat | 8.6% | 10% | 33 of 55 |
| Nights at 20°F or colder | 28/yr | 25/yr | 14 of 55 |
| Days with 1 inch+ of rain | 6.4/yr | 6.8/yr | 40 of 55 |
| Freeze-thaw days | 94/yr | 89/yr | 11 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 Mercer County: freezing from November to March, heavy rain in February, April and May.
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