Phone answered 24/7 · Arlington, VA and nearby communities

Call 24/7: (703) 462-1739
Four Mile Run Water Damage HelpArlington, VA · Answered 24/7

What Is a Storm Surge and How Does It Damage Homes?

Last updated October 26, 2026

Call Now (703) 462-1739

The short answer

What Causes a Coastal Storm Surge

A coastal storm surge builds when strong winds push ocean water toward the shore. The low pressure of the storm also allows the sea level to rise slightly, adding to the surge. The result is a wall of water that moves inland as the storm makes landfall.

The height of a surge depends on the storm's strength, size, and the shape of the coastline. Shallow coastal areas often see higher surges because the water has no place to go. Even a few feet of surge can push water miles inland along low-lying land.

The Main Ways Surge Water Enters Homes

Surge water does not need a broken window to get inside. It can seep through cracks in the foundation, come up through floor drains, or push under garage doors and entry doors. Once the water level outside rises above the lowest opening, it flows in steadily.

Homes built on slabs are especially vulnerable because the slab sits close to ground level. Crawl spaces and basements can flood even when the main floor stays dry. Water also backs up through sewer lines and storm drains, adding sewage to the floodwater.

  • Through windows and doors that are not sealed well
  • Through foundation cracks and gaps around pipes
  • Up through floor drains and toilet bases
  • Under garage doors that lack a tight seal
  • Through vents, utility openings, and electrical conduits
  • From the ground up through porous concrete and brick

Damage from Water Pressure and Debris

Floodwater pushes against walls, doors, and windows with enormous force. Even a modest surge of two or three feet can push a door inward, and deeper water can crack concrete walls or lift a home off its foundation. The pressure also forces water into every crack and joint.

Surge water carries debris, including tree limbs, pieces of other homes, and vehicles. This debris slams into walls and can break windows, allowing even more water inside. The combination of pressure and impact often causes structural damage that is not visible until the water recedes.

What Surge Flooding Does to Your Home's Structure

Saltwater from a coastal surge is more destructive than freshwater. It corrodes metal fasteners, electrical wiring, and appliances, and it soaks into wood, drywall, and insulation. Wet materials swell, warp, and begin to rot, and mold can grow within a day or two.

Structural components like floor joists, wall studs, and support beams can lose strength when saturated. Foundations can shift if the soil underneath is washed away. A home that looks fine from the outside may have hidden damage in wall cavities and under floors.

  • Wet insulation loses its ability to insulate and must be removed
  • Drywall and plaster crumble and need replacement
  • Wood framing warps, cracks, and may grow mold
  • Metal connectors and fasteners rust and weaken
  • Electrical systems short out and pose a fire risk
  • The soil under the foundation can erode, causing settling

Steps to Take After Surge Flooding

Act quickly after the water recedes. Turn off the power at the main breaker if it is safe to reach, and shut off the gas if you smell it or hear a hissing sound. Do not wade into floodwater, because it may contain sewage, chemicals, or hidden hazards like downed wires.

Take photos and notes of the damage for your insurance records, and check your policy to understand what is covered. Policies vary, and your insurer decides what is covered. Then contact local water damage pros to inspect the property and begin drying and cleanup.

Need help right now?

Every hour counts once water gets into floors and walls. One call starts the response.

Call Now (703) 462-1739

Frequently asked questions

How long does a coastal surge last?

A coastal surge usually lasts as long as the storm's winds push water onshore, which can be several hours. The water may stay elevated even after the storm passes, and it can take days to drain away. The exact duration depends on the storm's path and the local geography.

Can a coastal surge happen on a river or lake?

Yes, but it is less common. A coastal surge refers to ocean water pushed by a powerful storm, but strong storms can also cause water levels to rise in bays, estuaries, and rivers near the coast. Inland lakes usually do not see a true surge, but heavy rain and runoff can cause similar flooding.

What should I do if my home floods from a surge?

Stay out of the water and away from any electrical equipment. Take photos of the damage for your records, and check your insurance policy to see what is covered. Contact local water damage pros to assess the flooding and start the cleanup process once it is safe to enter.

Call Now (703) 462-1739