Prince William County, Virginia · Manassas
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Pipes freeze in Prince William County on about 13 nights a year, mostly December to February. Older homes, 4% of the stock here, are most at risk.
Basements flood here mostly in August. Prince William County averages 7.6 days a year with an inch of rain or more.
Backups often follow heavy rain, which Prince William County gets about 7.6 days a year, when storm water overloads sewer mains and pushes up through the lowest drain in the house.
Roof leaks here come from summer downpours and, with about 70 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
3% of occupied homes in Prince William County heat mainly with wood or propane, below the Virginia county median of 11.9%.
With 74 muggy nights a year, mold in Prince William County can appear within days of a leak. Dry first, then clean.
Local risk profile
Prince William County covers 335 square miles of northeast Virginia, with about 488,880 residents and 161,852 homes. Besides Manassas, the county seat, the biggest communities are Dale City, Lake Ridge and Woodbridge. Much of its housing is recent, with a median build year of 1995.
26/100 Water Damage Risk Index: Moderate Prince William County ranks 95 of 95 Virginia counties. See the statewide ranking and method.The three factors where Prince William County ranks highest compared with other Virginia counties.
For frozen pipes, Prince William County is a typical Virginia county, which is still plenty. It averaged 75 freezing nights a year over 2015–2024, 13 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 95 Virginia counties that's 50th.
On February 20, 2015 the low fell to about 2°F, and in the stretch ending January 2018 the county went 7 days in a row below freezing. Leaks from split pipes typically appear the day the thaw arrives.
Most freezing nights fall from December to February, 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.
On average the first fall freeze arrives around Nov 8 and the last spring freeze around Mar 29.
Prince William gets fewer downpours than most Virginia counties, but they still fill basements. The county gets about 40.6 inches of rain and melted snow a year, with 7.6 days of an inch or more (86th of 95). Those downpours cluster in August, September and October, when sump pumps and gutters are tested hardest. The wettest day on record brought 3.88 inches on July 22, 2018. Multi-day storms matter most for basements; the wettest three days on record here totaled 5.88 inches (through July 24, 2018).
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 70 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
Roughly 24% of the county's housing was built before 1980. That puts Prince William among the newer housing stocks of Virginia's 95 counties.
41% of homes were built in 2000 or later, more than in most of Virginia. Newer plumbing rarely corrodes, so damage here tends to come from appliance supply lines, water heaters, sump pumps and storms.
35% 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.
Beyond water
About 74 nights a year in Prince William County stay at 65°F or warmer, a sign of muggy summer air (35th of 95 counties). July 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 Prince William County's occupied homes: 54% utility gas, 40% electric, 3% propane and under 1% 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 Prince William County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Fauquier and Loudoun get more pipe-freeze nights than Prince William. Fairfax County has the oldest housing nearby, with 44% of homes built before 1980.
By the numbers
| Factor | Prince William | Virginia median | Rank |
|---|---|---|---|
| Homes built before 1960 | 4.4% | 20% | 93 of 95 |
| Homes built before 1980 | 24% | 46% | 88 of 95 |
| Homes built 2000 or later | 41% | 25% | 10 of 95 |
| Manufactured or mobile homes | 0.9% | 9.6% | 90 of 95 |
| Vacant homes | 3.1% | 15% | 94 of 95 |
| Wood or propane heat | 3.3% | 12% | 89 of 95 |
| Nights at 20°F or colder | 13/yr | 14/yr | 50 of 95 |
| Days with 1 inch+ of rain | 7.6/yr | 10/yr | 86 of 95 |
| Freeze-thaw days | 70/yr | 77/yr | 70 of 95 |
| Muggy nights (65°F+) | 74/yr | 64/yr | 35 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 Prince William County: freezing from December to February, heavy rain in August, September 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