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How Do I Stop Water From Seeping Into My Basement?

Last updated October 26, 2026

The short answer

Check Your Gutters and Downspouts

Water seeping into a basement often starts above ground. Clogged gutters overflow and dump water right next to the foundation. Clean gutters in spring and fall, especially before heavy rain. Make sure downspouts extend at least 6 feet away from the house so water moves off the soil.

If downspouts are short or missing, add extensions. You can also aim them toward a dry well or a low spot in the yard. This simple fix stops a lot of seepage before it ever reaches the basement wall.

Improve the Slope Around Your Foundation

The ground around your home should slope away from the walls. Over time, soil settles and creates low spots where water collects. Fill those areas with topsoil and compact it lightly. Aim for a slope of at least 6 inches over the first 10 feet from the house.

If you live in Arlington, check the grade after heavy storms. Rain can wash soil away and expose the foundation. Rebuild the slope as needed so water runs off, not toward the basement.

  • Look for puddles within 10 feet of the house
  • Add soil to low spots near the foundation
  • Use a rake or shovel to spread soil evenly
  • Avoid piling mulch against the walls
  • Check the slope twice a year

Seal Cracks in Walls and Floors

Hairline cracks in concrete let water push through under pressure. Use a masonry crack filler or hydraulic cement for larger gaps. Clean the crack first, then apply the filler with a trowel. Let it cure fully before testing with water.

For floor cracks, use a concrete patching compound. Pay attention to where the wall meets the floor, a common seepage point. Sealing these gaps reduces moisture but does not fix a high water table or poor drainage.

Install or Improve Interior Drainage

If water still seeps in, consider an interior drain tile system. This involves cutting a channel around the basement perimeter, laying a pipe, and covering it with gravel. A sump pump then moves collected water out. This is a bigger project, so hire a pro for the excavation.

A simpler option is a dehumidifier to manage damp air. It will not stop active seepage, but it helps dry out walls and floors. For ongoing water flow, the pros can assess the situation and recommend the right fix.

  • Interior drain tile near the wall-floor joint
  • Sump pump with a check valve
  • Dehumidifier for damp air
  • Waterproof paint on interior walls
  • Exterior excavation for foundation coating

When to Call Local Water Damage Pros

Seepage that returns after simple fixes points to a deeper problem, like a high water table or a failed foundation drain. The pros can inspect the area and find the actual source. They use moisture meters and may dig around the outside to locate the issue.

They can also handle flooded basement cleanup if water has already damaged belongings. Act quickly to prevent mold growth. If you see standing water or stained drywall, call the pros soon. Policies vary, and your insurer decides what is covered.

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Frequently asked questions

Why does my basement seep only after heavy rain?

Heavy rain saturates the soil and raises the water table around your foundation. If your gutters or grading are off, water pools near the walls. The pressure forces moisture through cracks. Fixing drainage usually solves this.

Can I seal the basement from the inside only?

Interior sealing helps with minor dampness but does not stop water under pressure. Water can push through the coating or find another crack. For lasting results, address the outside drainage first, then seal inside.

Is a sump pump necessary for basement seepage?

Not always. A sump pump is useful when water collects under the floor or in a drain tile system. For light seepage, fixing gutters and grading may be enough. A pro can tell you if a pump is worth the setup.

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