Smyth County, Virginia · Marion
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With 30% of homes built before 1960 and about 24 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
February brings the most downpours to Smyth County, part of 7.5 heavy-rain days a year. Check the sump first.
Sewage backups in Smyth County spike on heavy-rain days, about 7.5 a year, when sewer mains fill up and water finds the lowest drain.
Smyth County's wettest day in the 2015–2024 record brought 3.71 inches, and about 97 freeze-thaw days a year mean ice dams in some winters.
10% of occupied homes in Smyth County heat mainly with wood or propane, below the Virginia county median of 11.9%.
Muggy summer nights, lows of 65°F or more, come about 4 times a year in Smyth County. Mold after a leak spreads fastest from June through August.
Local risk profile
About 29,420 people live in Smyth County, 451 square miles in southwest Virginia, in roughly 15,080 homes. Marion is the county seat; Chilhowie, Saltville and Adwolf are the next largest communities. The county's median home was built in 1973.
55/100 Water Damage Risk Index: Elevated Smyth County ranks 34 of 95 Virginia counties. See the statewide ranking and method.The three factors where Smyth County ranks highest compared with other Virginia counties.
Smyth is on the colder side of Virginia for pipes. In the 2015–2024 record the county logged about 24 nights a year at or below 20°F (7th of 95) 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 8 days below freezing (ending January 2018), and the low bottomed out near -8°F on February 20, 2015.
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.
On average the first fall freeze arrives around Oct 21 and the last spring freeze around Apr 24.
Smyth gets fewer downpours than most Virginia counties, but they still fill basements. About 7.5 days a year bring an inch or more (89th of 95), most often in February, out of 50.3 inches of total precipitation. On September 26, 2024, 3.71 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 7.6 inches (through September 28, 2024).
About 97 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
Virginia's 95 counties range widely in housing age; Smyth ranks 3rd, with 62% of its homes built before 1980.
Before 1960 is when 30% of these homes went up. Galvanized supply lines and cast iron drains were standard then, and after 60-plus years both corrode and crack, often out of sight inside a wall or under a slab.
About 26% of homes went up between 1980 and 1999. Some houses from the late 1970s to the mid-1990s were plumbed with polybutylene, a gray plastic pipe known for failing at fittings. A plumber can tell you in a few minutes whether you have it.
Manufactured and mobile homes make up 16% 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.
Renters occupy 29% of homes. If you rent, the building is usually the landlord's to repair, but your belongings are only covered by renters insurance.
Beyond water
About 4 nights a year in Smyth County stay at 65°F or warmer, a sign of muggy summer air (91st of 95 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 Smyth County's occupied homes: 7% utility gas, 70% electric, 4% propane and 6% wood. Wood heat is more common here than in most Virginia counties. Heating equipment is one of the leading causes of home fires nationally, and the NFPA recommends having chimneys and vents inspected every year.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Smyth County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Bland and Tazewell get more pipe-freeze nights than Smyth. Its housing is the oldest in the area by share of homes built before 1980.
By the numbers
| Factor | Smyth | Virginia median | Rank |
|---|---|---|---|
| Homes built before 1960 | 30% | 20% | 15 of 95 |
| Homes built before 1980 | 62% | 46% | 3 of 95 |
| Homes built 2000 or later | 12% | 25% | 93 of 95 |
| Manufactured or mobile homes | 16% | 9.6% | 30 of 95 |
| Vacant homes | 16% | 15% | 42 of 95 |
| Wood or propane heat | 10% | 12% | 59 of 95 |
| Nights at 20°F or colder | 24/yr | 14/yr | 7 of 95 |
| Days with 1 inch+ of rain | 7.5/yr | 10/yr | 89 of 95 |
| Freeze-thaw days | 97/yr | 77/yr | 2 of 95 |
| Muggy nights (65°F+) | 4/yr | 64/yr | 91 of 95 |
Rank 1 is the highest value. Bars run from the lowest to the highest Virginia county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Smyth County: freezing from November to March, heavy rain in February, April 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