Low Water Pressure in My Area

Is the low pressure in the area or just my house?

The quickest test is the same as for a full outage. Ask the neighbours on your side of the street, and check your water company’s incident map by postcode, the same way you would check for a water leak in your area. Thames Water, Affinity Water, SES Water and Essex & Suffolk Water all publish live problems online, and a burst main or valve work a few streets away is the most common reason for a sudden drop that affects everyone.

If neighbours are fine and you are not, the problem is almost always on your side: a part-closed stopcock, a failing pressure reducing valve, a blocked filter, or an old lead or iron supply pipe that has furred up. That is a different job, covered in how to increase water pressure in a house.

If the whole street is weak, and has been for days or keeps coming back at the same times, read on. That points to the network, and the water company has legal duties about it.

Why pressure drops across a whole area

Water pressure in the street is not fixed. It falls when demand rises, and it falls further the higher and further you are from the reservoir or pumping station feeding your area. The main causes of area-wide low pressure are:

• Peak demand, typically weekday mornings and early evenings, and every warm evening in a heatwave when gardens are being watered
• A burst or leak on a main nearby, which lets water escape before it reaches you
• Planned work where valves have been partly closed to reroute supply
• Pressure management, where water companies deliberately reduce pressure in some zones, often at night, to cut leakage from their pipes
• Height: top-floor flats and houses at the top of a hill sit closest to the minimum the network provides
• A fault at a booster pumping station serving a high part of the network

A sudden drop to a trickle across the street, with water or road damage outside, is a burst. Report the burst to the water company straight away rather than waiting to see if it improves.

How to measure your water pressure properly

Water companies take a report far more seriously when it comes with numbers. You need a cheap screw-on pressure gauge, sold for around £10 to £20, that fits a standard outside tap or washing machine valve. Our guide to reading a water pressure gauge covers fitting one.

Fit the gauge to the outside tap or the washing machine cold valve, since both are usually on the mains. Make sure nothing else in the house is using water, open the valve and read the static pressure. Then open the kitchen cold tap fully and read it again: that running figure is what you actually feel at the tap. As a rough guide, 1 bar is about 10 metres of head, so the legal minimum below works out at about 0.7 bar.

Measure flow too, because pressure alone can mislead. Time how long the kitchen cold tap takes to fill a 10 litre bucket. Under a minute means over 10 litres a minute, which is fine for most homes. Well over a minute is low flow, whatever the gauge says. Do both tests at a quiet time, such as mid-morning, and again at peak time. Write down the date, time and figures each time.

What the water company has to supply

Under the Water Supply and Sewerage Services (Customer Service Standards) Regulations 2008, water companies in England must maintain a minimum pressure of seven metres static head in the communication pipe serving your property, the section from the main to the street boundary, usually where your boundary stop tap sits.

If pressure falls below that for an hour or more on two occasions within 28 days, a household is entitled to a £50 payment under the Guaranteed Standards Scheme, and since July 2025 it can be paid up to five times a year. The company should pay automatically where it knows which homes were affected; where it could not have known, you must claim within three months of the second occasion. There are exceptions, including necessary works, drought and events outside the company’s control. This is where your written log earns its keep.

Seven metres is a low bar. A home can meet the legal minimum and still have a shower that barely runs, especially upstairs or with a combi boiler that needs good mains flow to deliver hot water. Low pressure that is legal is not something the water company will fix, but it is something you can improve inside your own property.

How to report low pressure in your area

Report it through your water company’s website or the 24-hour number on your bill. Give your postcode, whether neighbours are affected, the times it happens and your gauge readings. Ask directly whether your area is under a pressure management scheme and whether they can fit a pressure logger at your boundary, which records pressure over several days and gives both sides a firm answer.

If the company confirms pressure at your boundary is fine but your taps are weak, the loss is inside your property. If it confirms a network problem, ask what the planned fix is and when, and keep logging. Where a problem drags on, the Consumer Council for Water handles complaints about water companies free of charge.

When low pressure is really a plumbing fault

Several faults inside the home feel exactly like low mains pressure. A kitchen tap that is weak on its own usually has a blocked aerator or a part-closed isolating valve, which low pressure at the kitchen tap deals with. A pressure reducing valve near the stopcock can stick and throttle the whole house. And many London homes still have a narrow lead supply pipe from the boundary, which may have been adequate decades ago but cannot feed a modern combi, a big shower and a washing machine together.

On a low water pressure call-out, the engineer measures pressure and flow at the boundary and at the stopcock, which shows at once whether the loss is in the street or the house. From there it is a matter of opening, cleaning or replacing whatever is causing the drop, or pricing a larger job such as a new supply pipe or a pressure booster pump. You pay the £60 call-out, and the repair price is agreed with you on site before any work starts.