Blog>Expert Advice>Tap leaking from stem - causes & how to fix it
Last updated: 30 September 2024
Tap leaking from stem - causes & how to fix it
Is your kitchen, bathroom or outside tap leaking from the stem? There are few reasons why this might be happening. Let's take a look at the common causes and discover the best fixes for this problem.

Signs tap is leaking from the stem
A tap stem is responsible for controlling water flow and temperature when a tap is turned on.
The stem consists of several components and is attached to the inside of the tap's handle. When the handle is turned to the 'on' position, the stem opens the valve, allowing water to travel out of the spout.
In a mixer tap, the components inside the stem control the hot and cold water flow at once. In twin lever taps, there is a stem in both the hot and cold side.
It is not surprising that leaks from this part of the tap are common, considering the stem components are responsible for controlling water flow. If you are not sure whether the leak is due to a faulty stem or not, here are some other telltale signs to look out for:
Temperature issues - Several components inside of the stem work to control how much hot and cold water passes through the tap. Your water may run too hot or too cold if any of these parts are worn or faulty
Uneven water flow - There is likely an issue with the tap stem if your tap is delivering an uneven water flow. This can look like a slow flow of water when the tap is fully turned on, sputtering or dripping
A faulty stem can cause leaks around the tap's body. Failing to fix this problem can lead to wasted water and higher water bills. This is the case for most leaks, it is always best to resolve the issue as soon as possible.
Why is my tap leaking from the stem?
Over time, minerals from the water can build up inside the tap and cause key components to become worn and faulty.
Here are the three most common causes of a tap leaking from the stem:
Damaged O ring - O rings are used to create a water tight seal inside of a tap. This small rubber circle may be damaged and allowing water to leak out
Worn washer - A rubber washer is inserted into a tap stem to prevent water from leaking when the tap handle is in the 'off' position. It is common for washers to wear down over time and need to be replaced
Worn spindle - A key component of many household taps, the spindle is part of the tap's stem and moves up and down to control the water flow. Leaks can happen if any of the spindle components have become worn or damaged
Why is my faucet leaking from the stem when I turn it on?
Worn O rings are typically the cause of a leak around the stem when the tap is running. A water tight seal can't be formed without a fully intact O ring and water will leak out when the tap is on.
Why is my kitchen tap leaking from the stem when turned off?
Are you having to tighten your tap more than usual to stop the flow of water? A worn washer is likely the cause.
This small part is used to seal the valve when the tap is off. You may notice leaks around the stem if water is able to pass into the tap body when the tap is off.
Can't tell an O ring from a washer? Don't worry. A professional plumber can help you to find out why your tap is leaking and fix the problem in no time.
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How do you fix a leaking tap stem?
Fixing a leaking tap is fairly straightforward if you know what you're doing. You will need to dismantle the tap to access all of the stem components and find out what is causing the leak.
However, attempting to fix the tap yourself may lead to more damage. We recommend hiring a professional if you don't have the skills, tools and knowledge needed for a DIY fix.
If you still want to try fixing the leak yourself, here's a simple guide for you to follow:
Turn off the water supply
First things first, turn off the water supply. The last thing you want is to accidentally flood your kitchen!
Dismantle the tap
Different steps are needed to dismantle different types of tap. We recommend researching instructions for your specific tap if you are unsure how to remove it's main body from the sink.
The tools you need to remove the tap will also vary depending on what style faucet you have. For example, you may need a box spanner or basin wrench, both of which are available in various sizes.
Inspect the stem components
Once you have access to the inside of your tap, it is time to find out what is causing the leak. Carefully inspect all of the stem components, including the O ring, washers and spindle.
Different taps use different spindle components to control water flow. The spindle may use a threaded nut, rubber washers, ceramic discs or other materials to create a seal and 'pack' the stem in place.
Check over all of the different parts. Look out for any rips, tears or corroded areas.
Replace O rings
If the O ring is worn down, it will need to be replaced. You will need to order the right size O rings for your tap model to make sure a water tight seal is formed.
To replace the O ring, carefully cut the old rubber away and thread the new part into place.
Replace washers
Worn washers are also quick and easy to replace. Use tweezers to carefully remove the old washers and slide the new one into position.
As with the O ring, you will need to make sure your new washers are the correct size for your tap.
Replace the spindle
A build up of grime on the tap spindle can lead to leaks and other problems. Carefully clean the spindle and make sure all components look to be in good condition.
As we mentioned earlier, different spindle designs use different components to control the water flow. If your spindle is damaged and needs to be replaced, it is important you install the specific part needed for your tap model.
Older compression style spindles can be 'repacked' to stop a leak. In a compression spindle tap, the repacking process involves wrapping specialist plumbing packing material around the top of the spindle.
If the above sounds too complicated, we recommend getting in touch with a local plumber. Alternatively, tap repair may be within the skillset of an experienced handyperson.
Hire a qualified and reputable tradesperson to do the hard work for you!

Cost to repair a leaking tap
We do not recommend attempting to fix a leaking tap yourself. Without the correct tools and skills, a DIY fix may end up causing more problems. Leaks can get worse if all of the tap components are not correctly secured in place.
A skilled handyperson will likely have the skills and knowledge needed to fix a leaking tap. On average, it costs £30 an hour to hire a handyperson in the UK.
Alternatively, a plumber will be able to repair the leak and replace any damaged parts. However, as this is a small job, it may be more cost-effective to have all other plumbing repairs done at the same time.
Plumbers charge an average hourly rate of £50 and the average day rate is£350.
Key Takeaways
Common causes of tap stem leaks include worn O rings, damaged washers or a faulty spindle
Typically, replacing worn components can stop a tap leaking from the stem
Different tap models use different components in the stem. It is important to make sure you buy the right replacement parts
Plumbers charge an average hourly rate of £50
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