Areas We Serve

Areas We Serve

What Causes Loud Banging in My Pipes (Water Hammer)?

Ever turn off a faucet and hear a loud bang or clunk in your plumbing? It can make you stop in your tracks. Many Bellevue homeowners describe it as a hammering noise, especially when a washing machine or dishwasher shuts off suddenly. Plumbers call this water hammer.

It might seem like just an annoyance, but those jolts can actually stress your pipes. At 2 Sons Plumbing Bellevue, we deal with this problem every week, and the good news is there are reliable fixes once you know what’s behind it.

What’s Really Happening in Your Pipes

That banging sound has a name—water hammer—and it happens when rushing water suddenly has to stop or change direction. The sudden pressure shift sends a jolt through your pipes, which is what makes them bang around.

The easiest way to picture it? Think about hitting the brakes hard in your car. Everything inside lurches forward all at once. Your plumbing reacts the same way when water is forced to stop.

It can sound a little alarming, but in most homes, it’s not a major emergency if you catch it early. The problem is, if you ignore it, those constant jolts can shake fittings loose, strain the joints, and eventually cause leaks you don’t want to deal with.

DIY Fixes to Try First

If the banging is light or only happens now and then, you may be able to quiet your pipes with a few simple steps.

Strap Loose Pipes

Check under sinks or in the basement. If you see pipes rattling, use straps or brackets to hold them tight. That alone often helps.

Recharge Air Chambers

Older Bellevue homes sometimes have vertical air chambers that absorb shock. Over time, they fill with water and stop working. To recharge them, shut off your main water, drain the pipes by opening faucets, then slowly turn the water back on.

Don’t Slam Faucets

Closing taps too quickly, or appliances shutting off water instantly, can make hammering worse. Try easing faucets closed to reduce the impact.

When You Need a Plumber

If the banging happens all over the house or keeps coming back after you’ve tried the DIY fixes, it’s time to call in a professional. The most effective solution is usually installing water hammer arrestors. These small devices absorb the shock so your pipes don’t take the beating.

At 2 Sons Plumbing Bellevue, we place arrestors where they’re needed most—near washers, dishwashers, or sinks that trigger the noise. Installation usually costs $250–$600 per arrestor, depending on your plumbing system.

Stop Water Hammer Before It Gets Worse

That banging in your pipes isn’t just a nuisance—it’s your plumbing’s way of warning you. Left alone, it can turn into leaks and costly repairs. The licensed plumbers at 2 Sons Plumbing Bellevue know how to find the cause and fix it the right way.

Whether it’s tightening up loose pipes, recharging your plumbing system, or installing arrestors, we’ll get it handled fast and done right. Call us today at (206) 487-1757. We’ll check things out, stop the banging for good, and make sure your Bellevue home feels safe, quiet, and comfortable again.

2 Sons Plumbing, Electrical, Heating & Air

4.9

Based on 3817 reviews

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Jennifer Suemnicht

2 months ago

I asked some of my real estate colleagues who people have been using for plumbing repairs lately and several said “2 Sons”! So friendly and responsive. Came out right away for an estimate, had the best follow up, came in with the best price, and got me on the schedule and got the work done on the very next day! Everyone I spoke with was friendly and fantastic! Highly recommend!

Jennifer Suemnicht

2 months ago

Katy Garner

3 months ago

We had a mystery leak per our meter reading. Riley and Riley saved the day. They promptly discovered the issue, resolved and repaired our pipes in one service call. They were quick, thorough and entirely delightful. They took the time to talk me through the job. I felt heard, safe and comfortable with the two of them in my house. For my next plumbing disaster I hope to get ‘The Riley’s’; but know, whoever comes will be excellent. Thanks 2 Sons!

Katy Garner

3 months ago

Aaron Sutter

3 months ago

2 Sons are my go to plumbers and I recommend them to friends and family looking for a recommendation.
2 Sons had my tenant's water heater replaced in the same day I called them! Justin and his apprentice were awesome! This wasn't a "quick" replacement in the garage - they had to figure out how to squeeze in the water heater through a tight crawl space on their hands and knees under furnace ducting.
Justin was knowledgeable and helpful in troubleshooting different replacement scenarios. He was kind and patient with my number of questions. He never once complained to me about the undesirable placement of the water heater under the house. My tenant even commented to me how kind Justin was to her.
Thank you for making this a quick and easy fix!

Aaron Sutter

3 months ago

Oksana Naidu

3 months ago

Highly recommend 2 Sons. We had a leak in the master bath due to some malfunctioning fixtures and needed to install shut off valves on the hot and cold water lines to prevent further leaks while we waited on the faulty part replacements to be delivered. It was a treat to work with a professional and honest plumbing company that also does quality work. A great experience from first call to post-completion follow ups. Marcos, who was assigned to our job, was just awesome - thorough, efficient, knowledgeable, professional, courteous and helpful. He took his time to fully assess the issue, provided great options and then quickly repaired the problem. Thanks so much for great service in a stressful situation.

Oksana Naidu

3 months ago

Happy Lemon

3 months ago

We had an outstanding experience with this company! They provided incredibly fast, careful, and professional service for our commercial business. From start to finish, their customer service was absolutely excellent-responsive, friendly, and truly attentive to our needs.

A special thank you to our technician, ADAM, who did an exceptional job fixing our clogged hand sink. He was knowledgeable, efficient, and extremely professional & polite. He quickly resolved it with great skill and attention to detail.

Highly recommended!

Happy Lemon

3 months ago

Louisa

4 months ago

Trung our tech and his apprentice Cole did a fantastic job yesterday. They worked tirelessly to replace our old CPVC pipes, install our new shower, and replace our kitchen sink. The job had a multitude of delays due our pipes not being plumb and some extra wall demo. They worked for at least 13+ hours yesterday and left our home at 11 pm. Trung wanted to ensure that we didn't have our water off longer than necessary. We could not be more thankful and grateful for their efforts in the rough in for our bathroom remodel. We look forward to having them back to install the shower/ tub combo, new bathroom faucet, and new toilet with a bidet seat. Trung always went out of his way to explain what was going on and helped us make informed decisions about our home. This is our 3rd or 4th time using 2 Sons and we couldn't recommend them more!

Louisa

4 months ago

Kathy Cook

4 months ago

I have to say Bob was amazing!!! I had a clogged drain in my kitchen sink. Bob came in and took every precaution to be neat & clean. He explained to me what he was going to do and gave me the pricing and I agreed and he got to work. He was super kind and polite and fixed my drain issue. He was a pleasure to work with. I would highly recommend using 2 Sons!

Kathy Cook

4 months ago

Emily Speakman

4 months ago

Had issues at home with water backup. Dave was prompt, professional, and genuinely kind. He communicated between myself and my landlord, explaining the issues and next steps. He quickly put an interim solution in place and outlined the long-term needs. Felt super reliable and easy to work with — highly recommend 2 Sons Plumbing.

Emily Speakman

4 months ago

Frank Church V

4 months ago

We contacted these Plumbers on a Friday using Yelp quotes, and they were the fastest to reply and the fastest to engage with us when we had questions. We felt that warranted to give them the opportunity to give us the first consultation. Sometimes we get multiple consults if we get any icky feeling from the people doing it. We didn’t feel that way with this company.

Our toilet was leaking, and we expected we probably could use a new one. But wanted a professional estimate and options.

We got hooked up with their team to schedule it and they were able to give us a time only a day out. We asked for a 8-1pm window and received automated text and a formal phone call from a dispatcher saying how far out the plumber technician was.

The plumber who showed up was named Carey. We also a received a picture of him before he arrived for safety concerns which I thought was a good touch of care from the company. Carey was lights-out the best guy we could have asked for.

He showed up within the approximate eta and was kind, gracious, considerate of our space and gave us a myriad of options. He quoted us prices that felt quite fair, and we chose the option where he removes the toilet and chooses a toilet for us: though we talked about the various options beforehand.
All and all he left for 30 min to get the toilet: and returned to install it. Installation was complete within another 30 minutes.

He was so good man. And we just felt like this is how service and care and things should be in this world. It’s always refreshing when you get that. Because so many outfits just: make you regret everything.

The work was quick, professional, and he was happy to be there and gave us information every step of the way that we respected and appreciated.

We will use this company in the future. You earned our respect and business.

Frank Church V

4 months ago

Sitong Liu

4 months ago

I initially hired this company to address a leak in my water service line. Due to repeated misdiagnosis and unsuccessful repair attempts, the work ultimately escalated into a full water service line replacement, resulting in a final cost far higher than what I had initially expected. While the replacement is now completed and functioning, the overall experience was frustrating and poorly managed.

From the start, pricing and expectations were unclear. I was told repair costs couldn’t be determined until excavation, yet on the day of work—before anything began—I was asked to sign for a high fixed repair price based on assumptions that were never discussed during the estimate.

The first repair attempt failed, and the leak clearly continued. No further investigation was done, I was required to pay in full, and I was told a discount would only apply if I committed to a full water service line replacement the same day, before the issue was properly resolved.

After paying for a second leak detection myself, the original leak was confirmed to still be present. Management involvement was requested but delayed, and during a follow-up visit I was asked to sign a new agreement stating the work was only a “repair attempt” with no warranty, despite the original repair being sold as warrantied.

I later proceeded with the water service line replacement based on specific assurances about the final cost, but the estimate I received did not align with those assurances. Throughout the process, I had to make multiple phone calls and send repeated emails over several days just to get responses.

While the final replacement works, the lack of technical competence, shifting pricing and warranty terms, and consistently poor communication made this an unnecessarily stressful experience. I would not use this company again.

Sitong Liu

4 months ago