Is the shut-off valve under the sink not shutting off the water? (We have a solution) | improved house (2023)

It is important to always turn off the water before beginning any home improvement project. But what to do if the shut-off valve does not work correctly? From bad poppet valves to a broken pipe, let's take a look at what you can do if your shutoff valve isn't working.

Is the shut-off valve under the sink not shutting off the water? (We have a solution) | improved house (1)

It doesn't matter if you're working on a home improvement project or in the middle of a plumbing emergency. When the shutoff valveIt does not workThe way it's supposed to work, it can be a real pain in the ass. So what to do if the water does not turn off with the sink shutoff valve? What causes it

If the shutoff valve under the sink won't shut off the water, it could be because the valve is stuck, partially closed, or leaking. Alternatively, it could be a broken pipe or a leaking poppet valve. Only repairing or replacing the valve will help solve this problem.

In this article we will talk about the shut-off valve and the problems that can cause it to malfunction. Plus, we offer some quick and easy solutions to help you turn off the water.

Related content:Is your poppet valve leaking?| How to remove a poppet valve | Is the main water shutoff valve stuck?

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Is the shut-off valve under the sink not shutting off the water? (We have a solution) | improved house (2)

What is the stop valve?

The shut-off valve is in every type of house. Most appliances and fixtures in your home have their own individual shutoff valve. These are your water heaters, sinks, toilets, and dishwashers. So they can be repaired or replaced.

If the shutoff valves on these things don't work, you can usuallyUse the main shutoff valve. It is the valve that shuts off the flow of water to the rest of the house to allow construction work or repairs to take place.

The various valves act as safety precautions in case one of the other valves fails. Finally, there must be a way to shut off the water supply to an area in need of repair or replacement.

What is the culprit?

There are a number of things that could be the problem behind your valve not turning off the water all the way.. Being able to identify the problem is the first step to fixing it. If you can identify the problem with the shutoff valve, you can start applying the right solution to the job.

There are a handful of things that can go wrong with your shutoff valve. This applies to both the local shutoff valve and the main shutoff valve that controls the flow of water to your home. Here's what to watch out for and how to combat these issues.

a stuck valve

Perhaps the most common reason your shutoff valve won't close is that the valve is stuck. Here the valve simply does not turn. This applies in particular to major shutdowns and older plants.

The simple fix is ​​a bit of WD-40.. Allow some time to properly lubricate the valve before trying again. In most cases, this will fix the problem, at least temporarily. Be sure to give the valve time to lubricate.

For long-term maintenance, it is important to periodically open and close the valves and spray with WD-40. This helps prevent rust and other common problems that cause valves to not close.

valve date partially

There are other times when you can turn the valve, but not all the way. While that's better than not being able to move it, it still leaves a valve that won't close and keep flowing. This partial shutdown is just as annoying as the one that won't shut down.

Unfortunately, the fix isn't as simple as it could be for a stuck valve.You can try spraying on some WD-40 to see if it opens, but it will likely require a whole new valve.. It's probably best to replace the valve entirely, as other damage may have occurred to the valve that WD-40 cannot repair.

Purchasing a new valve ensures that it will turn smoothly and perform as it should. No more headaches, no more hassle opening and closing the valve.

leaky valves

You may be able to close the valve completely. This can make it seem like everything is as it should be. But then you realize thatit is leakingfrom the main water valve or any of the secondary valves connected to your equipment and devices.

The most common cause of this is a leaking seal.. Start by squeezing all the accessories together with pliers. If nothing is damaged, that should be enough to prevent leaks. However, if the leak persists, things can get much more complicated.

Start by taking the entire valve apart, replacing the washer first. If replacing the shim doesn't work, you may need to replace the entire valve, as it can take a lot of time and troubleshooting to find the culprit.


One of the most common problems in winter is opening the shutoff valve only to find that it won't stop the flow of water.One of the main reasons homeowners shut off their water supply in the winter is to prevent pipes from freezing during extended periods of non-use..

Although this practice is introduced to save pipes, water often freezes between the shutoff valve and the faucet. In this case, the pipe freezes and eventually bursts. The downside is that you may not even notice the problem until you turn the water back on.

As soon as you turn the water back on, it's clear there's a problem. If you have closed the shutoff valve for an extended period during the winter, check for leaks or broken pipes before turning the water back on. This will save you some confusion and heartache in the end.


There are some old houses or facilities that will havea poppet valve callinstead of the traditional shut-off valves we are familiar with. These valves have a T-handle and can be particularly prone to things like leaks.

If you find that you have a poppet valve, try to replace it with a regular check valve as soon as possible.. This will prevent water damage as these old valves are prone to leaking and bursting.

Can I fix these problems myself?

You can fix the valves under the sink yourself and you don't have to be a plumber or be certified for this type of work. You must first discover the real problem before you can do the job. So follow this guide and review each of the most common problems before you decide to call a plumber.

However, you need to make sure that you have the necessary equipment to get the job done. Also check with your local jurisdiction to see if they have permission to fix this. Valves are usually for DIY projects; It's the actual plumbing that they want you to have planning permission to fix or repair.

When to hire a plumber

If you're not sure what you're doing or aren't comfortable with larger DIY projects, this might be a good idea for you to hire a professionalfor this Proyect. Or, if you've tried unsuccessfully to fix it yourself, the problem may be deeper in your plumbing, requiring you to have any problems checked by a plumber to find out what's going on.

A certified plumber has all the necessary equipment to repair and diagnose the valve problem. They use equipment worth tens of thousands of dollars and can do some jobs you couldn't do otherwise. But try it yourself first because they can still fix anything you accidentally mess up.

Do you need to hire a plumber?

Receive free, no-obligation quotes from professional contractors near you.


Is the shut-off valve under the sink not shutting off the water? (We have a solution) | improved house (3)

Familiarize yourself with your installation

In general, it's a good idea to become familiar with the plumbing in your home. While you may not be comfortable doing plumbing repairs or modifications, it is important to know where the shutoff valves are located.

That way if there is oneInstallationyou can locate the shutoff valve and at least avoid potential water damage. Without knowing the location of the shutoff valves, you could get stuck and watch water damage unfold in front of you.

Most of the time, the problem is related to a damaged or broken shut-off valve. Get repairs or replacement done as soon as possible to prevent future leaks or potential water damage to your home.

Ryan Womeldorf

Ryan Womeldorf has over a decade of writing experience. He loves to blog about construction, plumbing, and other home related topics. Ryan also loves hockey and is a lifelong Buffalo sports fan.

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