8 Common Causes of Low Water Pressure in Your Home

1. Pipe Blockages Caused by Sediment, Rust or Foreign Objects

Blockages inside pipes are among the leading causes of low water pressure. Over time, debris, rust or mineral deposits can accumulate inside water lines, reducing the internal diameter and limiting flow.

Common contributing factors include:

• Sediment from hard water that gradually builds up inside pipes
• Rust and corrosion from ageing galvanised steel or iron pipes
• Foreign materials, such as small debris, entering the system during plumbing work
• Bacterial growth in stagnant or underused water lines

Professional plumbers often use inspection cameras and pipe flushing techniques to locate and remove blockages. Replacing outdated piping materials in older homes may be the only viable solution to restore full water flow.

2. Undetected Leaks Hidden Within Walls or Underground

Not all leaks are immediately visible. A drop in pressure without signs of damage or water pooling could indicate a hidden leak somewhere within the plumbing system. These can occur in wall cavities, under concrete slabs, or yard pipework.

Indicators of hidden leaks include:

• A sudden or progressive drop in pressure at multiple outlets
• Unexplained increases in water bills
• Mould or damp odours around the home
• Soft patches or water pooling in the garden

Leak detection equipment, such as thermal imaging and acoustic sensors, allows plumbers to locate these problems without damaging walls or flooring. Prompt repairs can prevent further water loss and structural damage.

3. Water Pressure Regulator Failure or Incorrect Settings

Pressure regulators control the water pressure entering a home from the mains supply. When they fail or are incorrectly set, household water pressure can be too high or too low.

Common signs of regulator issues:

• Inconsistent water pressure between fixtures
• Sudden changes in pressure without any external cause
• Noisy pipes due to pressure fluctuations



A licensed plumber can test and recalibrate the regulator or replace it entirely. This ensures consistent pressure throughout the home and protects internal plumbing and fixtures from damage caused by pressure surges.

4. Obstructions in Tap Aerators & Showerheads

Sometimes, a blocked aerator or showerhead causes low pressure at a single outlet. Over time, calcium, debris, and dirt can accumulate at these endpoints, reducing flow.

Signs of localised fixture blockage:

• Weak water flow from a single tap or shower
• Uneven spray patterns or dribbling
• Discolouration or debris around the outlet



In most cases, cleaning or replacing the fixture resolves the issue. However, the problem may lie deeper within the plumbing system if multiple outlets are affected.

5. Corroded or Ageing Pipe Infrastructure

Corroded pipes in older homes can restrict water flow and cause pressure loss. Galvanised steel pipes, which were common several decades ago, are especially prone to internal corrosion that builds over time.

Indicators of pipe corrosion:

• Brown or rusty-coloured water
• Metallic taste in drinking water
• Flaking or corroded pipe exteriors
• Noticeably reduced flow even when taps are fully open



In these cases, plumbers may recommend replacing affected sections or upgrading the entire system to copper or PEX piping. Modern materials offer better durability and resistance to corrosion.

6. Shared Supply Issues in Multi-Dwelling Properties

In townhouses, duplexes or multi-unit residences, homes may share a single mains connection. When multiple units draw water simultaneously, it can reduce user pressure.

Common effects of shared supply:

• Pressure drops during peak usage hours, such as early mornings
• Reduced pressure in upstairs fixtures
• Inconsistent performance between different rooms or levels



A plumbing assessment can identify if the pressure loss is due to a shared supply rather than internal faults. Solutions may involve installing pressure-boosting pumps, enlarging pipe diameters, or arranging individual metering and supply connections.

7. Valve Issues: Partially Closed Main Shut-off or Meter Valves

Water valves control flow throughout a plumbing system. If a main shut-off valve or water meter valve is not fully open, pressure can be restricted at every outlet in the house.

How valve issues present:

• Low pressure throughout the entire house
• Recent plumbing work or renovations that involved valve adjustment
• Lack of pressure improvement even after other repairs



A licensed plumber can inspect all key valves to confirm they are fully open and functioning properly. In some cases, valve components may need replacement if damaged or corroded.

8. Faulty Plumbing Installations or Recent Renovations

Incorrect plumbing design or unqualified work during renovations can lead to pressure issues. Pipe sizing, layout or fixture compatibility all play a role in overall system performance.

Potential installation-related problems include:

• Pipes that are too narrow to handle household flow demands
• Sharp bends or long pipe runs that reduce pressure
• Poorly integrated fixtures that require higher pressure than the system can deliver
• Incompatibility between old and new piping materials



Professional plumbers assess the system holistically, checking that all components—from hot water systems to outlet fixtures—are appropriately configured and compliant with local plumbing standards.

Looking for a Reliable Emergency Plumber Near You?

Water pressure problems can be more than a daily nuisance—they often signal deeper plumbing issues. A range of issues can affect flow, from pipe blockages and hidden leaks to failing valves or poorly planned renovations. While some causes are minor and easy to fix, others require professional diagnosis and repair to prevent further disruption or damage. Understanding the common causes of low water pressure empowers homeowners to respond quickly and avoid larger plumbing failures.

At ACS Plumbing, we help homeowners and renters identify the source of low water pressure and provide reliable, lasting solutions. Whether it’s a hidden leak, faulty valve, or pipe corrosion, our plumbers in Tamworth will ensure your system is assessed and restored to full function. Get in touch or book a professional consultation today.