A weak shower, slow-filling toilet or kitchen tap that has suddenly lost force can all be described as “low pressure”. Sometimes the pressure is low, but a restriction can also reduce the amount of water flowing even when the incoming pressure is reasonable. These safe checks will help narrow down the cause without dismantling pipework.
Is one outlet affected or the whole property?
Start by comparing several outlets. Check the cold kitchen tap, another cold tap and the affected fitting. The cold kitchen tap is useful because it is often the first tap supplied by the incoming main.
- One tap only: the tap aerator, cartridge, isolation valve or local pipework may be restricted.
- One shower only: the shower head, hose, filters or its particular supply may be limiting the flow.
- Hot outlets only: the fault is likely within the property’s hot-water supply rather than the street main.
- Every cold outlet: check the stopcock, possible leaks and the water supplier’s local network information.
Note whether the change was sudden or gradual and whether it is worse at particular times. Demand on the mains can be higher in the morning and early evening, so some variation can be normal.
Check the internal stopcock gently
A partly closed internal stopcock can restrict the whole property. It is often under the kitchen sink or close to where the water main enters the building. If it moves freely, turn it anticlockwise gently to confirm it is open. Never force a seized or corroded valve, and do not use extra leverage.
After checking it, look for drips around the valve and nearby joints. If the stopcock leaks, will not move or does not fully control the supply, arrange a repair rather than repeatedly operating it.
Ask a neighbour and check local incidents
If nearby homes are affected at the same time, the cause may be planned work, a burst main or another network problem. Check your water supplier’s incident page or contact them directly. If neighbours have a normal supply but your whole property does not, the problem is more likely to be on your private supply pipe or internal plumbing.
Flats and some older properties may share a supply or rely on communal pumps and storage. Tenants should tell the landlord or managing agent if common areas or several flats are affected.
A simple flow check at the kitchen tap
WaterSafe and water companies use a useful guide: with all other taps and water-using appliances off, the first cold tap should normally fill a 4.5-litre container in about 30 seconds where there is a suitable single supply pipe. This is a flow check rather than a precise pressure test, but it gives useful information to pass to the water supplier or plumber.
Use a stable container that fits safely in the sink, avoid lifting it when overfilled and do not carry out the test if the tap cannot be controlled reliably.
Safe checks for one weak tap or shower
If only one outlet is affected, inspect the visible outlet for limescale or debris. A removable tap aerator or shower head can restrict flow when scaled, but follow the manufacturer’s cleaning instructions and avoid tools that may scratch or crack the fitting.
Check whether a service valve below the fitting has been left partly closed after recent work. Do not force slotted or corroded valves. If the problem began after plumbing work, contact the installer and explain exactly when the flow changed.
Do not fit a pump as a guess
A booster pump is not the right answer to every pressure problem. The cause might be a leak, undersized or restricted pipework, a shared supply, a partly closed valve or a fault elsewhere in the system. Pumps connected to a mains supply must be selected and installed in line with water regulations. Ask the water supplier and a suitably qualified plumber before making changes.
When should you call for help?
- The pressure or flow has dropped suddenly and there is no known network incident.
- The water meter moves when all water use has stopped.
- The stopcock or another valve is leaking, seized or corroded.
- Several outlets are affected but neighbouring properties are normal.
- There are damp patches, running-water sounds or signs of a hidden leak.
- The supply repeatedly falls to a trickle or stops completely.
For no water or very low pressure across the whole property, contact the water supplier first as well as reporting any suspected leak. For internal restrictions, valves, leaks and pipework checks, call Ricky on 07939 013120 or email Essexemergencyplumbing@gmail.com with your location and the outlets affected.
A useful landlord record
At the start of a tenancy, record the location of the stopcock and test the cold kitchen tap while the property is empty. If a tenant later reports reduced flow, note which outlets are affected, the time of day and whether neighbours have the same problem. That evidence helps separate a local fitting fault from a supply issue.