Drain cleaning /
sewer services
Drain cleaning, sewer repair & hydro-jetting across Seattle
Same-day appointments · ★★★★★ 5-Star Google Reviews
Licensed • Bonded • Insured • Residential & Commercial
Our drain cleaning and sewer services include:
🔷 Drain Cleaning – Clear clogs and slow-moving drains to restore proper flow
🔷 Hydro Jetting – High-pressure water jetting to remove tough blockages and debris
🔷 Sewer Camera Inspections – Pinpoint problems inside sewer and drain lines with video diagnostics
🔷 Sewer Repair / Sewer Replacement – Fix broken, collapsed, or offset sewer lines
🔷 Sewer Lining – A trenchless method that creates a seamless inner lining to reinforce damaged pipes
🔷 Outdoor Drainage Systems – Install or maintain exterior drains to prevent yard or basement flooding
🔷 Sump Pump Installation – Keep crawl spaces and basements dry with professionally installed sump pumps
🔷 Septic Tank Services – Routine maintenance or repairs to keep your septic system functioning
🔷 Pressure Reducing Valves – Regulate incoming water pressure for long-term system health
WHY CHOOSE KNOCKOUT PLUMBING FOR DRAIN & SEWER WORK?
Our Seattle-based plumbing team is highly experienced in drain and sewer systems, offering both rapid response and long-term solutions. We use top-of-the-line equipment to diagnose and repair issues with minimal disruption to your home or property. We’re committed to clear communication, fair pricing, and doing the job right the first time.
FAQ – DRAIN CLEANING & SEWER SERVICES
How do I know if my drain is clogged?
You might notice slow-draining sinks, gurgling sounds, foul odors, or water backups. Our team can quickly identify and fix the issue.
How often should I clean my drains?
We recommend drain maintenance every 6–12 months to prevent buildup and costly repairs. Hydro jetting and inspections are excellent preventive options.
What are signs of a sewer line issue?
Multiple drain clogs, sewer smells, soggy patches in the yard, or toilet backups may indicate a damaged sewer line.
Do you offer emergency drain services?
Yes! Knockout Plumbing is available for 24/7 emergency drain and sewer repairs in the Seattle area.
What’s the difference between sewer lining and replacement?
Sewer lining is a trenchless option that creates a new inner pipe without digging. Replacement involves removing and replacing the damaged pipe, typically for more severe cases.
👉 Need drain or sewer service now? Contact Knockout Plumbing today to book a visit or request a quote.
Posted on Google
Justin GerardyTrustindex 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 PottsTrustindex 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 SeifnerTrustindex 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 MartinTrustindex 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 FranklinTrustindex 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 JohnsonTrustindex 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
SimoneTrustindex 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 WiederspanTrustindex 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!