Low water pressure in your home can be more than just an inconvenience—it may be a sign of an underlying plumbing issue that requires professional attention. Whether you’re dealing with weak water flow in the shower or slow-filling sinks, understanding the potential causes behind low water pressure is essential to protecting your plumbing system and preventing costly repairs. In this article, we’ll explore the common plumbing-related causes of low water pressure and what you can do about them.
Common Causes of Low Water Pressure
1. Pipe Corrosion or Deterioration
Over time, old or aging pipes—especially galvanized steel or poly B plumbing—can corrode or accumulate mineral deposits. This buildup narrows the inside of the pipe, restricting water flow. If your home is over 30 years old and you’re noticing low pressure throughout, a plumbing inspection may reveal it’s time to replace outdated pipes.
2. Leaks in the Plumbing System
A hidden leak can reduce the water pressure in part or all of your home. Leaks not only waste water but also lower the amount of pressure reaching your fixtures. Signs of a hidden leak may include damp spots, mold growth, or unusually high water bills. Professional leak detection is essential to locate and repair the issue promptly.
3. Clogged Pipes or Fixtures
Mineral deposits, sediment, or debris can build up inside your plumbing pipes or at the fixture level (such as faucet aerators and showerheads), especially in areas with hard water. Clogged lines reduce flow and often require pipe cleaning or descaling services to restore proper pressure.
4. Faulty Pressure Regulator
If your home has a pressure-reducing valve (PRV), a malfunction can cause pressure to drop too low—or spike dangerously high. A professional plumber can test the regulator and adjust or replace it as needed.
5. Municipal Supply Issues
Sometimes the issue lies outside your home. If the city’s water supply is experiencing a temporary problem—such as maintenance or supply reduction—it can affect your home’s water pressure. However, if your neighbors aren’t experiencing the same issue, the cause is likely within your private plumbing system.
Why You Shouldn’t Ignore Low Water Pressure
While low water pressure may seem like a minor nuisance, it can be a warning sign of serious plumbing problems, such as:
- Pipe corrosion or collapse
- Slab leaks or underground line damage
- Water heater issues
- Unsafe drinking water due to backflow or contamination
Ignoring the problem can lead to expensive water damage, mold growth, and reduced plumbing efficiency over time.
When to Call a Professional Plumber
If you’ve ruled out simple fixes like cleaning aerators or checking shut-off valves, it’s time to call a licensed plumber. A professional plumbing inspection can accurately diagnose the root cause and recommend effective solutions—whether that’s pipe repair, pressure adjustment, or full plumbing system replacement.
Low water pressure doesn’t have to be your new normal. At Pacific Blue Mechanical, we specialize in diagnosing and resolving water pressure issues for homes across Vancouver and the Lower Mainland. From pipe replacement to system upgrades, we’ll restore your plumbing performance quickly and efficiently.