Low water pressure is one of the most frustrating day-to-day plumbing issues a homeowner can deal with. A weak shower that never quite rinses shampoo out properly, a tap that takes an age to fill a pot, or an irrigation system that barely reaches the garden are all symptoms that something in your water supply system is not working as it should.
Across Melbourne’s western suburbs, low water pressure has a number of common causes that are specific to both the local housing stock and the infrastructure that serves this part of the city. The cause might be something simple and completely outside your control, or it might be an internal problem a plumber can fix in a single visit. Here is how to work out which situation you are in.
Is the Problem Coming From Outside Your Property?
Before assuming a problem with your internal plumbing, check whether low pressure is affecting your neighbours or is a known issue in your area.
City West Water, which supplies water across the western suburbs, occasionally undertakes maintenance work on mains infrastructure that temporarily reduces pressure to nearby properties. Check the City West Water website or call their customer service line to see if there are any active works in your street or suburb.
If your neighbours are experiencing the same low pressure at the same time, the problem is in the supply infrastructure rather than your property, and City West Water is responsible for resolving it. If only your property is affected while neighbours have normal pressure, the issue is almost certainly internal.
Common Causes of Low Water Pressure Inside the Home
Several internal factors can reduce water pressure to levels that make everyday tasks frustrating. Many are particularly common across western suburbs homes due to the local housing stock and soil conditions.
A faulty pressure-reducing valve: Many homes have a pressure-reducing valve installed where the water main enters the property. This valve protects internal pipes from supply pressure fluctuations. If the valve fails or is set too low following recent maintenance, it restricts pressure to every outlet in the home. A licensed plumber can test, adjust, or replace this valve in a single visit.
Partially closed stop taps: Check the stop tap at the meter and any secondary valves in the property. If one has been partially closed during previous maintenance and not fully reopened, pressure throughout the property will be reduced as a result.
Mineral buildup in ageing pipes: In older homes across the established parts of the western suburbs, calcium and mineral deposits accumulate inside pipes over decades, gradually narrowing the internal diameter. The result is progressively worsening pressure that develops slowly over years rather than suddenly.
A hidden leak: A significant leak anywhere in the pipe system reduces the pressure available at the outlets. If the drop in pressure developed suddenly rather than gradually, a hidden leak is worth investigating before assuming any other cause.
A failing hot water system valve: Some hot water systems have their own pressure-limiting valve or pressure-relief valve that affects the hot water supply specifically. If only your hot water pressure is low while cold water pressure remains normal, the issue is likely within the hot water system itself rather than the main supply pipes.
A blocked tap aerator or showerhead: If only one outlet has low pressure while all others are normal, the aerator or showerhead at that outlet may be blocked with mineral deposits. Remove and clean or replace it before calling a plumber.
When to Call a Licensed Plumber
Call Westwater Plumbing for low water pressure if:
- The pressure is low throughout the entire property, not just at one outlet
- Cleaning aerators and showerheads has not improved the situation
- The problem developed suddenly, which may indicate a burst pipe or a hidden leak
- You have an older property with galvanised pipes, where mineral buildup is the likely cause and pipe replacement may be necessary
- You need a pressure-reducing valve tested, adjusted, or replaced
Westwater Plumbing carries pressure testing equipment that identifies exactly where in your pipe system the pressure loss is occurring, allowing us to apply a precise fix based on the actual cause rather than guesswork.
