Can old plumbing affect water pressure?

Yes, old plumbing is one of the most common causes of poor water pressure in Toronto homes. Aging pipes, especially those installed before the 1980s, can significantly restrict water flow due to mineral buildup, corrosion, and outdated pipe materials.

Galvanized steel pipes, common in Toronto homes built between 1950-1980, are notorious for developing rust and mineral deposits that narrow the interior diameter over time. What started as a 3/4-inch pipe may effectively function like a 1/2-inch or smaller pipe after decades of buildup. These pipes typically need replacement after 40-50 years, meaning many Toronto homes are reaching or past this threshold.

Lead service lines are another culprit in older Toronto neighborhoods. The city has been actively replacing lead water service lines since 2007, but thousands remain. Beyond health concerns, these aging lines often have reduced flow capacity. If your home was built before 1955, there's a higher likelihood of lead pipes affecting both water quality and pressure.

Copper pipes from the 1960s-1980s generally perform better but can still develop pinhole leaks and corrosion, particularly in Toronto's moderately hard water conditions. The mineral content in Toronto's water supply, while safe to drink, can accelerate pipe deterioration over time.

Toronto-specific considerations include the city's water pressure standards (minimum 20 PSI, optimal 40-80 PSI) and the fact that many older homes have undersized service lines. Toronto Water may need to upgrade your water service connection if you're doing a major plumbing renovation, especially when converting to higher-capacity fixtures or adding bathrooms.

Professional assessment is crucial because poor water pressure can stem from multiple sources - the city's main line, your service connection, or internal plumbing. A licensed plumber can perform pressure tests at different points to isolate the problem. Don't attempt to modify water service connections yourself, as this requires permits and must meet Toronto Water standards.

Next steps: Have a licensed plumber test your water pressure at the main shutoff valve and at various fixtures. If old pipes are the culprit, plan for repiping during your next major renovation - it's much more cost-effective than doing it as a standalone project. Contact Toronto Water at 416-392-2489 to check if your area is scheduled for water main upgrades, which could affect your renovation timing.