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How to Flood-Proof Your Home Before Storm Season

Last updated October 25, 2026

The short answer

Seal Foundation Cracks

Water finds any opening. Inspect your foundation for cracks, gaps, and holes. Use a concrete patching compound to fill small cracks. For larger gaps, consider a waterproof sealant. Pay attention to where pipes and wires enter the home, as these are common entry points.

If you notice significant settling or structural issues, a local water damage pro can assess the situation. They can identify hidden vulnerabilities that you might miss. Fixing these before a storm hits is far easier than dealing with a flooded basement later.

  • Check the basement walls and floor for any visible cracks.
  • Seal around utility lines and pipes with caulk or foam.
  • Look for areas where the ground meets the foundation and slope soil away.
  • Inspect window wells and cover them with clear plastic shields.
  • Test your sump pump by pouring water into the pit.

Install a Sump Pump Backup

A sump pump is your first defense against groundwater. But if the power goes out during a storm, a standard pump is useless. Install a battery backup system for your sump pump. This ensures it keeps working even during an outage.

Test the pump regularly to make sure it activates and drains properly. Clean the pit and check the float switch for debris. If you don't have a sump pump, consider having one installed by a professional. It's a key part of flood-proofing.

Make sure the discharge line directs water well away from your foundation. Extend it at least 10 feet from the house to prevent water from seeping back.

Improve Drainage Around Your Home

Proper grading keeps water moving away from your house. The ground around your foundation should slope downward at least 6 inches over 10 feet. If you have low spots where water pools, fill them with soil and compact it.

Clean gutters and downspouts so rain flows freely. Install gutter extensions to carry water at least 5 feet from the foundation. Consider adding a rain garden or French drain to manage heavy runoff.

Plan for heavy downpours by ensuring your drainage system can handle a sudden surge of water. Heavy storms can drop several inches of rain in a short time, so test your gutters and downspouts for clogs before the season starts.

Move Valuables and Install Check Valves

Floodwater can ruin anything it touches. Move electronics, furniture, and important documents to higher floors or elevated shelves. Store hazardous materials like paint or chemicals in sealed containers above flood level.

Install a backwater valve on your sewer line to prevent sewage from backing up into your home. This is especially important if your area has combined storm and sewer systems. Consult a plumber to determine the right type for your setup.

If your home has a basement, consider raising appliances like the water heater and washer onto platforms. This adds a few inches of protection against shallow flooding.

Prepare an Emergency Plan

Flood-proofing is more than physical barriers. Have a plan for what to do when a storm hits. Know how to shut off your electricity and water main. Keep important phone numbers handy, including your insurance agent and local emergency services.

Store a battery-operated radio, flashlights, and a first aid kit in an accessible spot. If flooding occurs, avoid walking through moving water. See a doctor if you feel unwell after coming into contact with floodwater.

Review your insurance policy to understand what flood damage is covered. Policies vary, and your insurer decides what is covered. Check your policy for details on flood coverage and consider adding it if you don't have it.

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Frequently asked questions

What is the most important step to flood-proof my home?

Start with sealing foundation cracks and improving drainage around your home. These two steps prevent most water entry. Also, ensure your sump pump works and has a battery backup. These basics protect against the most common flood scenarios.

Should I install a backwater valve myself?

Installing a backwater valve is a job for a plumber. It requires cutting into your main sewer line and proper installation to work correctly. Doing it wrong can cause more problems. Ask a local plumber for advice on the right valve for your home.

How often should I test my sump pump?

Test your sump pump at least once a month. Pour a few gallons of water into the pit and watch it activate and drain. Also, check the battery backup every month to ensure it holds a charge. Regular testing keeps the pump ready for a storm.

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