06/11/2026
Low Water Pressure: Common Causes in Older Ontario Homes
Low water pressure can be a persistent frustration for homeowners, especially in older Ontario properties. When water doesn’t flow strongly from faucets or showers, it may signal underlying plumbing issues common in ageing systems.
A frequent cause is mineral buildup and corrosion inside older pipes. Over time, minerals in hard water accumulate along pipe walls, narrowing the passage and restricting flow. This is especially common in homes with original plumbing installed decades ago.
Another factor can be outdated or undersized piping. Older homes were often built with narrower pipe diameters that may not meet modern household water demands. When multiple fixtures run at once, pressure drops become more noticeable.
Low pressure may also result from partially closed shut-off valves following repairs or seasonal maintenance. Municipal supply fluctuations can contribute as well, particularly in established neighbourhoods.
In some cases, the issue is localized. Clogged aerators or showerheads can restrict water flow, creating the appearance of a larger pressure problem.
Identifying the source of low water pressure helps homeowners understand whether a simple fix is possible or whether further plumbing assessment may be beneficial to maintain comfort and efficiency in older homes.