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Why Is My Storm Drain Backing up Into My Yard?

Last updated October 25, 2026

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The short answer

What Causes a Storm Drain Backup

Storm drains carry rainwater from your yard and roof away from your home. When something blocks that path, water has nowhere to go but up and out. Leaves, twigs, and dirt are common culprits, especially after a heavy storm. Tree roots can also grow into the pipe joints and slowly close off the opening.

Another cause is an overloaded municipal system. During a downpour, the public drain may fill faster than it can empty, and the water backs up into your yard. Cold, snowy winters can leave ice in the pipe, blocking flow during early spring thaws. A sudden warm spell after snow can produce more water than the ground can absorb.

  • Clogged grate or inlet covered with leaves
  • Root intrusion into the drain pipe
  • Collapsed or crushed pipe from ground movement
  • Heavy rain overwhelming the public system
  • Ice blockage from freezing temperatures

How to Check the Drain Yourself

Start by looking at the drain grate. Remove any obvious debris like leaves, sticks, or trash that might be sitting on top. Use a flashlight to peer inside if you can see the pipe. A visible blockage near the opening might be something you can pull out with a gloved hand or a small garden trowel.

If the grate is clear but water still pools, the clog is likely deeper in the pipe. You can try a plumber's snake or a pressure nozzle on a garden hose to dislodge the blockage. Be careful not to push the clog further down. If the water level doesn't drop after a few tries, stop and consider calling a professional.

When to Call a Professional

Some clogs are too deep or too stubborn for home methods. If you have tried clearing the grate and snaking the pipe with no luck, a plumber or a water damage pro can help. They have cameras to inspect the pipe and high-pressure equipment to clear roots and compacted debris.

Water pooling near your foundation or seeping into your basement is a more serious sign. Standing water can weaken soil and cause structural issues over time. If you notice water entering your home, you need to act quickly to prevent further damage. Local water damage pros can extract standing water and dry the affected areas.

  • Water entering your basement or crawlspace
  • Pooling that lasts more than a day after rain stops
  • A foul smell from the drain, suggesting sewage backup
  • Multiple drains in your yard backing up at once
  • Cracks or sinking in the ground near the drain

Preventing Future Backups

Regular maintenance can reduce the chances of a backup. Keep the drain grate clear of leaves and debris, especially in autumn and after storms. If you have trees near the drain line, consider having a plumber inspect the pipe every couple of years for root intrusion. You can also install a drain cover with smaller holes to keep out larger debris.

If your yard tends to flood during heavy rain, you might need to regrade the soil to direct water away from your home. A downspout extension can carry roof water farther from the foundation. In Detroit, where snowmelt adds extra water in spring, making sure your drain is clear before the thaw can help.

What the Pros Usually Do

When you call a water damage pro, they typically start by assessing the situation. They may use a camera to inspect the drain pipe and locate the blockage. Depending on what they find, they can clear the clog with a high-pressure jet or a mechanical auger. If the pipe is damaged, they might recommend repair or replacement.

If water has already entered your yard or home, the work may include water extraction and drying. Pros use pumps and wet vacuums to remove standing water, then set up dehumidifiers and air movers to dry out walls and floors. This helps prevent mold and structural decay. The exact process depends on the extent of the damage.

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Frequently asked questions

Can I clear a storm drain clog myself?

Yes, for simple clogs near the surface. Remove debris from the grate and try a plumber's snake or a hose nozzle. If the water doesn't drain after a few attempts, the blockage may be deep. In that case, call a professional to avoid pushing the clog further.

Will my insurance cover storm drain backup damage?

Policies vary, and your insurer decides what is covered. Some policies cover water backup, but not all. Check your policy documents and talk to your insurance company to understand your coverage. If you have damage, document it with photos before cleanup.

How can I tell if the backup is from my drain or the city's?

If multiple neighbors have the same problem, it could be a public system issue. If only your yard is affected, the problem is likely on your property. You can check with your city's public works department to see if they are aware of a local issue.

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