outdoor drainage systems in seattle

French drains & yard drainage to keep water away from your home

Same-day appointments · ★★★★★ 5-Star Google Reviews
Licensed • Bonded • Insured • Residential & Commercial

friendly and fast service you can trust

Get A Free Quote

STANDING WATER IN YOUR YARD?

Seattle’s rainy season is here. If water pools in your yard, runs toward your foundation or seeps into your crawl space, we’ll design a drainage system that moves it away from your home for good.

French drains & curtain drains
Downspout & gutter drain lines tied into proper discharge
Catch basins & yard drains for low spots
Sump pumps & battery backups for basements & crawl spaces
Licensed, bonded & insured, with upfront pricing

Water coming in now? Call or text (206) 858-2211

What is an Outdoor Drainage System?

Excess water around your home or business can lead to flooding, foundation damage, and erosion. Without a proper outdoor drainage system, standing water can seep into your basement, weaken your property’s foundation, and create hazardous conditions. Our Seattle plumbing experts specialize in designing and installing custom drainage solutions to protect your property and keep your landscape dry.

An outdoor drainage system helps redirect rainwater, groundwater, and runoff away from your home using French drains, catch basins, sump pumps, and grading techniques. Whether you’re dealing with a flooded yard, water pooling near your foundation, or excess runoff from heavy Seattle rains, our team can create an effective drainage solution tailored to your needs.

How Outdoor Drainage Systems Work

✔ Inspection & Assessment – Our experts assess your property’s drainage issues and determine the best solution.

✔ Drainage System Installation – We install French drains, catch basins, downspout extensions, and sump pumps to effectively manage excess water.

✔ Proper Grading & Pipe Placement – We ensure your landscape is correctly sloped, and underground pipes are installed to guide water away from your home.

✔ Seamless Restoration – Once the system is installed, we restore your yard and ensure everything blends naturally with your property.

✔ Final Testing & Maintenance Guidance – We test the drainage system to confirm functionality and provide tips on maintaining proper drainage.

Seattle’s Trusted Outdoor Drainage Experts

At Knockout Plumbing & Mechanical, we provide expert drainage solutions for homes and businesses across Seattle. Whether you need a French drain, sump pump installation, or full drainage system, our skilled Seattle plumbers have the experience to get the job done right.

Call us today at(206) 858-2211 or request a free consultation online to protect your property from water damage!

    
 
 
       Posted on Google  
    Justin Gerardy 
 
 
 
 Trustindex verifies that the original source of the review is Google. As a restaurant owner in Seattle, I tend to find it infuriating when tradespeople over charge. It’s a real problem in this city. Knockout was fair and fast. Can’t say how much I appreciate it. I’ll be back for sure.
  
 
      Posted on Google  
    Margot Potts 
 
 
 
 Trustindex verifies that the original source of the review is Google. Zack and his crew were able to come within a couple days of calling and resolved my issue within minutes. They were very friendly and generous - highly recommend!
  
 
      Posted on Google  
    Veronica Seifner 
 
 
 
 Trustindex verifies that the original source of the review is Google. Knockout was great to work with - very courteous, responsive, and fair pricing. Zach came out to cap off a gas line for an appliance we switched to electric. The option was to do it from the inside or from the outside and remove the dedicated pipe altogether. Zach gave reasonable pricing (checked with two other companies) and was able to get the job done right away with expertise and professionalism. Knockout will be our top-choice, first-call for any future pluming needs in our home.
  
 
      Posted on Google  
    Mindy Martin 
 
 
 
 Trustindex verifies that the original source of the review is Google. Excellent experience. I was considering replacing my water heater back in the spring and Knockout was one of the companies I shortlisted to talk to. Ultimately I decided to wait on replacement, but Knockout was definitely at the top of my list. When my water heater started leaking the other day, I immediately reached out to Knockout, and they were able to get me scheduled the next day! I was given the choice between Bradford White and AOS. Zach came out and did a fantastic job. Friendly but professional; quick and efficient but thorough. Knockout respected the quote I was given a few months back which was very competitive. I strongly recommend this company!
  
 
      Posted on Google  
    rozap _ 
 
 
 
 Trustindex verifies that the original source of the review is Google. I asked these guys about hydrojetting our old sewer line that would occasionally get clogged. Zach showed up and looked at the situation, and after chatting for a bit he figured I could DIY it so I would know how to do it rather than paying every time it happeened. So he showed me a fitting for my pressure washer I could get, and described what to do. I did all that and it worked great, and I saved $850 that it would have cost, and then I knew how to do it going forward. They didn't even charge me. They're super honest guys with a lot of integrity. Definitely recommend them.
  
 
      Posted on Google  
    Jason Franklin 
 
 
 
 Trustindex verifies that the original source of the review is Google. Colin and his team have completed 2 projects for us and is always very helpful and informative in his diagnosis and explaining his course of action. I highly recommend him and Knock out Plumbing for all your plumbing needs.
  
 
      Posted on Google  
    Michael Johnson 
 
 
 
 Trustindex verifies that the original source of the review is Google. Zach has done a number of plumbing jobs for us over the years ranging from large bathroom additions to smaller repairs, every time they've been top quality. I highly recommend Knockout!
  
 
      Posted on Google  
    Simone 
 
 
 
 Trustindex verifies that the original source of the review is Google. Zach is a consummate professional. He was thorough, timely, efficient, personable, and diligent. He returned the next day after the job to place a cover on a part, which is something my partner & I wouldn’t have known. Clearly, he has integrity, which in my book is paramount. We emphatically would not recommend anyone else, but him and his team for plumbing jobs. We were beyond pleased with Zach’s skill and caliber. 20/10 ⭐️
  
 
      Posted on Google  
    Evan Wiederspan 
 
 
 
 Trustindex verifies that the original source of the review is Google. Zack and his crew replaced my kitchen sink drain after it started leaking. I was really happy with the price, and the speed and quality of their work. It was also easy to get a quote and schedule over the phone. I would definitely hire Knockout Plumbing again in the future!