What causes low water pressure throughout my whole house?

Low water pressure throughout your entire house is typically caused by issues with your main water supply, water meter, or the pipes leading into your home, rather than individual fixture problems.

The most common culprits are mineral buildup in your main water line, a partially closed main shutoff valve, or corroded galvanized steel pipes if your Ottawa home was built before the 1980s. Many older homes in areas like the Glebe, Westboro, and Hintonburg still have original galvanized pipes that gradually restrict water flow as they corrode from the inside. A failing pressure regulator (if your home has one) can also cause whole-house pressure drops.

City-side issues can also affect your water pressure. Ottawa's water system occasionally experiences pressure fluctuations, especially during peak usage times or maintenance work. Your water meter or the connection between the city main and your home might be partially blocked or damaged. In some Ottawa neighborhoods, homes at higher elevations naturally experience lower pressure.

Check your main shutoff valve first - it should be fully open. If you have a pressure gauge, normal residential water pressure should be between 40-60 PSI. Anything below 40 PSI throughout the house indicates a supply problem that needs professional attention. Don't attempt to adjust pressure regulators yourself, as incorrect settings can damage fixtures and appliances.

For whole-house pressure issues, you'll need a licensed plumber to diagnose whether it's your home's plumbing system or a city supply problem. They can test pressure at multiple points, inspect your main line, and coordinate with the City of Ottawa if needed. For a free assessment of your water pressure concerns, request a quote from Ottawa Pro Plumbing.

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