How to Unblock a Downpipe Drain

PDF download Download Article
PDF download Download Article

A downpipe drain is the underground pipe that runs water from gutters away from a building and usually lets out at the curb. Over time, leaves, dirt, and other debris can clog up the pipe. If your downpipe isn’t draining or water is flowing out the back, then it’s probably clogged. First, try to dislodge it by feeding a hose into the pipe and hitting the clog with a high-pressure nozzle. If that doesn’t work, insert a plumbing snake into the pipe and break the clog up manually. With either method, you should be able to unclog your pipe without any expensive fixes or replacements.

Method 1
Method 1 of 2:

Using Water Pressure

PDF download Download Article
  1. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/9\/9c\/Unblock-a-Downpipe-Drain-Step-1.jpg\/v4-460px-Unblock-a-Downpipe-Drain-Step-1.jpg","bigUrl":"\/images\/thumb\/9\/9c\/Unblock-a-Downpipe-Drain-Step-1.jpg\/aid11676948-v4-728px-Unblock-a-Downpipe-Drain-Step-1.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>\u00a9 2024 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>\n<\/p><p><br \/>\n<\/p><\/div>"}
    The downspout is the pipe that runs down the building from the gutter to the underground downpipe. You have to remove the spout to access the downpipe. Remove the screws at the top of the downspout connecting it to the gutter. Then unscrew the straps attaching the spout to the house. Lift the spout out of its position at the opening of the downpipe. [1]
    • Depending on how tall the downspout is, you may need a ladder to reach the top. If so, make sure the ladder is on a flat, stable surface and don't stand on the top step to maintain your balance.
    • Remember that sometimes the downspout is clogged, not the downpipe. Look down the spout with a flashlight before removing it to see if there is a blockage in there. If so, spray down with a high-pressure hose to dislodge it.
  2. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/e\/e0\/Unblock-a-Downpipe-Drain-Step-2.jpg\/v4-460px-Unblock-a-Downpipe-Drain-Step-2.jpg","bigUrl":"\/images\/thumb\/e\/e0\/Unblock-a-Downpipe-Drain-Step-2.jpg\/aid11676948-v4-728px-Unblock-a-Downpipe-Drain-Step-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>\u00a9 2024 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>\n<\/p><p><br \/>\n<\/p><\/div>"}
    The hose’s normal pressure probably won’t be enough to dislodge the clog. Get a high-pressure nozzle to focus more pressure onto the blockage. Attach it to the front of your hose. [2]
    • You can buy high-pressure nozzles from the hardware store or order one online.
    • Make sure the nozzle doesn’t have to be squeezed. You won’t be able to squeeze it while it’s in the pipe.
    Advertisement
  3. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/5\/5d\/Unblock-a-Downpipe-Drain-Step-3.jpg\/v4-460px-Unblock-a-Downpipe-Drain-Step-3.jpg","bigUrl":"\/images\/thumb\/5\/5d\/Unblock-a-Downpipe-Drain-Step-3.jpg\/aid11676948-v4-728px-Unblock-a-Downpipe-Drain-Step-3.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>\u00a9 2024 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>\n<\/p><p><br \/>\n<\/p><\/div>"}
    Begin feeding the hose into the pipe. Push until the hose stops, indicating that you’ve probably reached the blockage. [3]
    • If your hose is too short, you can get an extender. Otherwise, just start spraying the water when the hose reaches its max length.
  4. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/1\/1c\/Unblock-a-Downpipe-Drain-Step-4.jpg\/v4-460px-Unblock-a-Downpipe-Drain-Step-4.jpg","bigUrl":"\/images\/thumb\/1\/1c\/Unblock-a-Downpipe-Drain-Step-4.jpg\/aid11676948-v4-728px-Unblock-a-Downpipe-Drain-Step-4.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>\u00a9 2024 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>\n<\/p><p><br \/>\n<\/p><\/div>"}
    With the hose right up against the blockage, go and turn the water on. Let the hose spray and see if it dislodges the clog. [4]
    • In some cases, the clog might be loose enough for the hose to poke right through it. If this happens, try spraying some water down the pipe anyway to clear up the rest of the clog.
  5. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/c\/c4\/Unblock-a-Downpipe-Drain-Step-5.jpg\/v4-460px-Unblock-a-Downpipe-Drain-Step-5.jpg","bigUrl":"\/images\/thumb\/c\/c4\/Unblock-a-Downpipe-Drain-Step-5.jpg\/aid11676948-v4-728px-Unblock-a-Downpipe-Drain-Step-5.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>\u00a9 2024 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>\n<\/p><p><br \/>\n<\/p><\/div>"}
    Go to the spot where the pipe lets out. If water and debris are coming out, then the clog was dislodged. Leave the hose in place until only water is coming out with no debris. This indicates that the clog is totally gone. [5]
    • Give the pipe a final test by pulling the hose out and removing the high-pressure nozzle. Then insert the hose again and turn it on low pressure. If the water comes out the other side, then the clog is gone.
    6. Advertisement
Method 2
Method 2 of 2:

Snaking out a Clog

PDF download Download Article
  1. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/3\/3f\/Unblock-a-Downpipe-Drain-Step-6.jpg\/v4-460px-Unblock-a-Downpipe-Drain-Step-6.jpg","bigUrl":"\/images\/thumb\/3\/3f\/Unblock-a-Downpipe-Drain-Step-6.jpg\/aid11676948-v4-728px-Unblock-a-Downpipe-Drain-Step-6.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>\u00a9 2024 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>\n<\/p><p><br \/>\n<\/p><\/div>"}
    If the water wasn’t strong enough to dislodge the blockage, you’ll have to remove the clog manually. A plumbing snake is a tool that plumbers use to clear drains. It has a wire string that you can lower down a drain and a spool that spins it to dislodge clogs. Get one from a hardware store and insert it into the downpipe. [6]
    • Snakes are a handy tool to keep around your home at all times because they can unclog any drain you have. If you don’t want to purchase one, hardware stores may rent them as well.
    • Do not use a power snake. Underground drains are usually PVC pipes, and power snakes could break them. [7]
  2. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/4\/4a\/Unblock-a-Downpipe-Drain-Step-7.jpg\/v4-460px-Unblock-a-Downpipe-Drain-Step-7.jpg","bigUrl":"\/images\/thumb\/4\/4a\/Unblock-a-Downpipe-Drain-Step-7.jpg\/aid11676948-v4-728px-Unblock-a-Downpipe-Drain-Step-7.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>\u00a9 2024 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>\n<\/p><p><br \/>\n<\/p><\/div>"}
    Insert the tip of the snake into the pipe and feed it through by pulling more wire out of the casing. Continue until you can’t push the snake any further, indicating that you’ve found the clog. [8]
    • Standard plumbing snakes are 50 feet (15 m). This should be enough for most downpipe drains, but if yours is longer, get a larger snake.
  3. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/8\/8d\/Unblock-a-Downpipe-Drain-Step-8.jpg\/v4-460px-Unblock-a-Downpipe-Drain-Step-8.jpg","bigUrl":"\/images\/thumb\/8\/8d\/Unblock-a-Downpipe-Drain-Step-8.jpg\/aid11676948-v4-728px-Unblock-a-Downpipe-Drain-Step-8.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>\u00a9 2024 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>\n<\/p><p><br \/>\n<\/p><\/div>"}
    Once you hit the clog, turn the screw on the front tip of the snake to the right. This locks the snake in place. Then turn the handle on the casing to spin the wire. This breaks up the clog. Work the snake back and forth a few times while spinning to get any remaining debris. [9]
    • Leave the snake in until after you check that the clog is dislodged so you don't have to re-insert it.
  4. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/4\/4c\/Unblock-a-Downpipe-Drain-Step-9.jpg\/v4-460px-Unblock-a-Downpipe-Drain-Step-9.jpg","bigUrl":"\/images\/thumb\/4\/4c\/Unblock-a-Downpipe-Drain-Step-9.jpg\/aid11676948-v4-728px-Unblock-a-Downpipe-Drain-Step-9.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><p>\u00a9 2024 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>\n<\/p><p><br \/>\n<\/p><\/div>"}
    Once you think you’ve broken up the clog, leave the snake in the drain and go get your hose. Spray it down into the pipe and see if water comes out the other side. If it does, then you successfully unclogged the pipe. If not, continue working the snake further to find other blockages. [10]
    • Leave the water running for a few minutes to wash away any remaining debris. Turn the hose off when only water is coming out with no debris.
    5. Advertisement

Expert Q&A

Ask a Question
200 characters left
Include your email address to get a message when this question is answered.
Submit
      Advertisement

      Things You’ll Need

      Using Water Pressure

      • Screwdriver
      • Garden hose
      • High-pressure nozzle

      Snaking Out a Clog

      • Plumbing snake
      • Garden hose

      Tips

      • You can prevent further downpipe clogs by installing a gutter guard at the pipe opening to catch any debris.
        Thanks
        Helpful 1 Not Helpful 1
      Submit a Tip
      All tip submissions are carefully reviewed before being published
      Name
      Please provide your name and last initial
      Submit
      Thanks for submitting a tip for review!
      Advertisement

      You Might Also Like

      How to
      Unclog a Drain with Baking Soda & Vinegar
      How to
      Properly Use a Plunger to Get Rid of Drain Clogs
      How to
      Unclog a Kitchen or Bathroom Sink
      How to
      Unclog an AC Drain
      How to
      Plunge a Kitchen or Bathroom Sink: Tips from a Pro Plumber
      10 Easy Solutions to Unblock a Clogged Bathroom Sink Drain
      How to
      Unclog a Slow Shower Drain (and Prevent Future Blockages)
      How to
      Clear a Clogged Waste Pipe
      How to
      Unclog an Exterior Drain Pipe
      How to
      Get Hair Out of Your Shower or Bathtub Drain
      How to
      Unclog a Drain with Salt and Vinegar
      How to
      Unclog a Bathtub Drain Naturally
      Kitchen Sink Clogged? Here’s What to Do
      How to
      Unclog a Shower Drain
      Advertisement

      References

      1. ↑ https://www.thisoldhouse.com/ask-toh/backed-downspouts
      2. ↑ https://youtu.be/k6q_Ct5zl54?t=151
      3. ↑ https://www.thisoldhouse.com/ask-toh/backed-downspouts
      4. ↑ https://www.thisoldhouse.com/ask-toh/backed-downspouts
      5. ↑ https://www.thisoldhouse.com/ask-toh/backed-downspouts
      6. ↑ https://www.houselogic.com/organize-maintain/diy-repair/how-to-unclog-gutter/
      7. ↑ https://www.thisoldhouse.com/ask-toh/backed-downspouts
      8. ↑ https://youtu.be/k6q_Ct5zl54?t=134
      9. ↑ https://youtu.be/k6q_Ct5zl54?t=137
      1. ↑ https://www.thisoldhouse.com/ask-toh/backed-downspouts

      About This Article

      Thanks to all authors for creating a page that has been read 62,241 times.

      Reader Success Stories

      • Giulietta Guignol

        Jun 1, 2021

        "Thank you for sharing your know-how! The problem seemed insoluble but your water idea is the solvent!"
      Share your story

      Did this article help you?

      Advertisement