Chantilly occupies the flat country south of Washington Dulles International Airport, where U.S. Route 50 crosses Route 28. Until about 1980 much of it was farmland; then subdivisions, office parks and shopping centers filled in the fields between the airport and Centreville. West of Route 28 the land flattens into a gentle valley underlain by shale and sandstone, and Cub Run, Flatlick Branch and Big Rocky Run wind through it toward Bull Run. Low relief means runoff spreads out and lingers instead of racing away, and open exposure to the west means wind and snow arrive with little in the way.
The Restoration Job doesn't do repairs; it simply links callers with local companies at no cost. Call (888) 317-9980 any time and we'll connect you with an independent restoration provider covering Chantilly homes and businesses.
How the call works: when you call (888) 317-9980, The Restoration Job connects you with an independent restoration provider that serves Chantilly. That provider inspects the damage, explains the scope and quotes the work. The Restoration Job doesn't perform restoration itself. Read our referral disclosure.
Open Ground Near Dulles: Derecho Winds and Blizzards
Weather records from Dulles, right on Chantilly's northern edge, show what this exposure can deliver. In the June 29, 2012 derecho, the airport measured a 71 mph gust, and the National Weather Service reported that falling trees caused most of the region's damage to buildings and cars. During the January 22 to 23, 2016 blizzard, observers recorded 30 inches of snow in Chantilly. The January 5 to 6, 2025 storm added 7.8 inches here and 6.0 inches at Dulles.
Each type of storm tends to produce its own claim. Wind lifts shingles and siding and drops limbs onto roofs, opening the house to rain. Deep snow loads gutters, builds ice dams and melts slowly into window wells and foundation backfill. Cold snaps after a storm split pipes in garages and exterior walls. Storm damage cleanup after any of these starts with sealing the building envelope.
Cub Run, Flatlick Branch and Slow-Moving Runoff
The Cub Run watershed covers 55.3 square miles, and about 14 square miles of Loudoun County upstream drain into it as well. Flatlick Branch and Big Rocky Run are among its tributaries, and Flat Lick Stream Valley Park takes its name from the first. All of it eventually flows to the Occoquan Reservoir. On flat ground, heavy rain on rooftops, parking lots and roads collects in swales, detention ponds and low corners of lots rather than draining off quickly. Homes along stream valley parks and at the low end of a subdivision are the ones most likely to see water reach a door sill or basement window.
Basements, Townhouses and Commercial Space
Most of the residential building here happened after 1980, so the problems are less about century-old plumbing and more about the systems built into newer homes:
- Sump pumps and battery backups that haven't been tested in years.
- Water heaters reaching the end of their service life in finished basements.
- Shared walls in townhouse rows, where one unit's leak becomes a neighbor's problem.
- Flat or low-slope roofs on office and flex buildings, where clogged drains back water into suites.
For a flooded lower level, water extraction and removal of wet pad come first, followed by several days of dehumidification.
When Water Is in the House Right Now
Shut off the water at the main for any plumbing leak. If water has reached outlets or a furnace, turn off power at the panel only if you can do so from a dry spot. Move vehicles, rugs and boxes out of the wet area and take photos. Call your insurer, then a restoration provider, and keep receipts for anything you spend to prevent further damage. Neighbors in Centreville and across western Fairfax County face the same steps after a storm.
Basement Humidity and Mold West of Route 28
Humid Virginia summers and cool basements make a good environment for mold. After a leak or seepage event, growth on drywall, carpet backing and framing can begin within a couple of days. Fast, measured drying is the main defense, followed by keeping basement humidity down with a dehumidifier. Persistent musty smells mean moisture is still hiding somewhere and should be checked.
Where Callers in the Chantilly Area Are
The same line also serves nearby communities such as:
- Centreville
- Franklin Farm
- Greenbriar
- Fair Lakes
- Fair Oaks
- Sully Square
- South Riding
Common Questions
Does homeowners insurance cover roof damage from a wind storm?
Wind damage, including rain that enters through a storm-caused opening, is generally covered by homeowners policies, subject to the deductible. Rising surface water is a different matter and needs flood coverage. Photograph the roof and interior before tarping if it's safe, and keep invoices for emergency repairs, since policies typically expect owners to prevent further damage.
How do I know if my Chantilly property is in a floodplain?
Start with an address lookup on FEMA's Flood Map Service Center. Fairfax County also maps minor floodplains along small streams and publishes a flood hazard map online. Properties near Cub Run, Flatlick Branch or Big Rocky Run and their stream valley parks are the most likely to show up.
A clogged roof drain flooded a leased flex or office space. Who is responsible?
Notify the landlord or property manager first, since roofs and drains are usually the owner's responsibility under a commercial lease. Your own business policy may cover contents, equipment and lost income. Move equipment and records out of the wet area, document everything, and get drying started; ceiling tiles and carpet tile soaked by roof water are usually replaced.