What causes low water pressure?
Low water pressure can be frustrating. Whether it's a weak shower, slow-filling bath, or taps that barely flow, poor water pressure can make everyday tasks more difficult and often indicates an underlying issue with your plumbing system.
The good news is that low water pressure is usually caused by a handful of common problems.
Your home has a low pressure hot water system
Many older New Zealand homes still operate on low pressure hot water cylinders. While these systems were common for many years, they typically deliver weaker pressure to showers and hot taps compared to modern mains pressure systems.If the hot water pressure is noticeably lower than the cold water pressure, your cylinder may be the cause.Blocked water filters
If your property uses rainwater tanks, bore water, or a rural water supply, blocked filters can significantly reduce water flow throughout the home.Filters require regular maintenance and replacement to ensure your water system continues operating efficiently.Faulty pressure reducing valve
Many mains pressure systems include a pressure reducing valve designed to regulate water pressure entering the property.Over time these valves can fail or become partially blocked, restricting water flow and causing pressure issues throughout the home.Ageing or corroded pipework
Older galvanised steel pipes can gradually become restricted by internal corrosion and mineral build-up.As the pipe diameter reduces, water flow decreases, often resulting in poor pressure at multiple fixtures around the home.Problems with pressure pumps
Many rural properties rely on pressure pumps to deliver water from storage tanks.If a pump is malfunctioning, incorrectly sized, or losing pressure, the entire household may experience reduced water flow.
Water leaks
Hidden leaks underground or within walls can cause a noticeable drop in water pressure.Common warning signs include:
Higher water usageDamp areas around the propertyPumps cycling on and off frequentlyUnexpectedly low pressure
When should you call a plumber?
If low water pressure is affecting multiple fixtures throughout your home, or if the problem has developed suddenly, it's worth having your plumbing system assessed.A professional inspection can quickly identify whether the issue relates to your hot water cylinder, pressure valves, filters, pumps, pipework, or water supply.If you're experiencing low water pressure in South Canterbury or North Otago, the Plumb FX team can help diagnose the cause and recommend the most practical solution to restore reliable water flow throughout your home.