Low water pressure usually comes down to one of a few things: a stopcock that isn’t fully open, a blocked tap or shower head, a leak on your supply pipe, old narrow pipework, or a problem on the water network itself. Across South Wales, a few quick checks will often tell you which. If they don’t, a local plumber can track down the cause and put it right.
Is it just your house, or the whole street?
Start here, because it saves a lot of head-scratching. Ask a neighbour if their water’s weak too.
If the whole street is affected, the problem is likely on the supply network. Check the Dŵr Cymru Welsh Water website for work or bursts in your area, or give them a ring. There’s nothing a plumber can do inside your home to fix a problem in the main.
If it’s just you, the cause is somewhere between the water main and your taps.
Quick checks you can do yourself
These are all safe and don’t need any tools beyond an old toothbrush:
- Check the stopcock. It’s usually under the kitchen sink. Make sure it’s turned fully anticlockwise. They sometimes get knocked, or aren’t opened fully after work.
- Check the isolation valves. Small valves on the pipes to taps, toilets or the shower can be half closed. A flat-head screwdriver slot in line with the pipe means open.
- Clean the tap aerator. Unscrew the tip of the tap and rinse out any grit or debris caught in the mesh.
- Clean the shower head. Soak it, then brush out the holes. If only the shower is weak, this is often the culprit.
- Compare taps. Is it every tap, only hot, only upstairs, or just one outlet? That pattern narrows things down fast.
Signs of a leak on your water supply
A leak on the pipe between the boundary and your house can quietly rob you of pressure. Watch for:
- Damp patches or unusually green grass along the line of the pipe outside
- A hissing sound near the stopcock when nothing’s running
- A water meter that keeps ticking over with every tap turned off
Leaks inside the house tend to show up faster, as stains on ceilings or damp under floors. If you find water where it shouldn’t be, our guide on what to do if you have a burst pipe will help you limit the damage while you get help.
Why older homes often have weaker pressure
Many older homes still have their original supply pipe. In some it’s lead, in others galvanised steel, and both can be narrow or furred up inside after decades of use. That restricts how much water gets into the house.
The type of system matters too. If your hot water comes from a tank in the loft, pressure upstairs will naturally be low because it relies on gravity. A combi boiler is limited by the incoming mains, so running two taps at once can leave both feeling weak.
Low water pressure in South Wales homes
Much of South Wales has fairly soft water, so limescale is less often the cause than in some parts of the UK. Grit and debris in aerators and shower heads still happen, especially after work on the mains.
In older terraces around Newport, Pontypool and the Valleys, it’s worth asking whether the supply pipe has ever been replaced. Homes on higher ground can also see weaker pressure at busy times of day. If you’re further east, we cover plumbing jobs in Chepstow and Monmouth too.
When to call a plumber
Call a professional if:
- The basic checks haven’t helped and the neighbours are fine
- You think there’s a leak on your supply pipe or inside the house
- Your pipework is old and you’re thinking about replacing it
- Pressure dropped suddenly after other work was done in the house
All of our plumbing work carries a one year parts and labour warranty.
Frequently asked questions
Why is my water pressure low only in the morning?
Morning is peak time, with the whole street showering and running taps at once, so pressure from the mains can dip. If it recovers later in the day and your neighbours notice the same, that’s usually the reason. If it’s weak all day, look for another cause.
Why is my shower weak but my taps are fine?
That points to the shower itself. A blocked shower head is the most common cause, followed by a faulty or clogged mixer valve. On gravity-fed systems, showers upstairs can also be weak because there’s little height between the loft tank and the shower head.
Can I fit a pump to boost water pressure?
Sometimes, but not always. Pumps can help on gravity-fed hot water systems. Fitting one directly to a mains supply isn’t allowed without the water company’s agreement, and it won’t fix a blocked or undersized pipe. It’s worth finding the real cause first.
Getting your water pressure back
Start with your neighbours and the simple checks. If low water pressure is still a problem after that, give us a call on 01633 865903 or drop us a message and we’ll come and find out what’s going on.
