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How to fix a basement drain that keeps backing up?

Fix your basement drain backup with clear steps to inspect, clean clogs, adjust slopes, check sump pumps, and improve exterior drainage for lasting relief.

Reviewed by Content Team

Head of Content, D. Gorenko

Updated June, 5

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How to fix a basement drain that keeps backing up?

 
Inspect the Drainage System for Blockages
 

  • Begin by visually inspecting the drain’s entrance and any visible piping to determine if debris, sediment, or roots are causing the backup.
  • Examine the entire length if accessible, noting any areas where water appears to pool or flow slowly.
  • Consider the possibility of external factors such as heavy rainfall causing overwhelmed municipal systems which can increase the volume of water entering your basement drain.

 
Clean the Interior of the Drain
 

  • Use a plumbing snake or drain auger to clear out any clog that may be causing the blockage. Carefully insert the tool into the pipe and push it through the obstruction.
  • If available, employ a high-pressure water jetter which can remove stubborn debris and grease build-up from the inside of the drain. Follow safety guidelines and wear protective equipment.
  • For minor blockages, consider using a drain cleaning solution designed for basement drains. Ensure that the product is compatible with your plumbing system to avoid corrosion or damage.

 
Examine the Drainage Slope and Configuration
 

  • Check that the pipes are properly sloped away from the basement to encourage water flow. Even a slight misalignment can cause water to stagnate and back up.
  • Inspect for low spots in the piping where sediment might accumulate over time. In some cases, regrading or replacing sections of the drain may be necessary to restore proper flow.
  • Verify that any connecting pipes between the basement drain and the municipal sewer or septic system are free of sagging sections that may collect debris.

 
Evaluate the Sump Pump and Its Operation
 

  • If your basement drain is connected to a sump pump, test the pump to ensure it is functional and responsive when water levels rise.
  • Look for signs of wear such as unusual noises, slow cycling, or failure to start. Regular maintenance including cleaning the pump basin and checking the float switch can extend its lifespan.
  • Replace or repair the pump if tests reveal inconsistent performance. In some cases, installing a backup pump system or a battery backup can be advantageous during power outages.

 
Improve Drainage Around Your Home
 

  • Ensure that the ground around your home slopes away from the foundation so that rainwater flows away instead of seeping in.
  • Clean gutters and downspouts regularly and extend downspouts at least several feet from the foundation to reduce the amount of runoff reaching the basement area.
  • Consider installing additional exterior drainage measures such as French drains or dry wells to manage heavy rainfall and reduce pressure on the basement drain system.

 

For instance, homeowners in St. Louis and Nashville can benefit from these drainage tips to mitigate water-related issues effectively.

 
Regular Maintenance and Professional Assistance
 

  • Schedule periodic inspections and cleaning of your basement drain system to prevent recurring blockages and backups.
  • Keep a log of maintenance activities and any problems encountered. This can be useful in identifying recurring issues and tracking when more intensive maintenance is required.
  • If the backup remains a persistent issue after undertaking basic cleaning and inspection, consider consulting a licensed plumber who can perform a more thorough diagnostic test, sometimes employing a video inspection camera to pinpoint hidden problems.

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