Ontario Building Code 2024: Plumbing and Water Supply Regulations for London Contractors
Sarah's Expert Insight
OBC Compliance Specialist
"As a senior consultant at empcontracting.ca Inc. your construction contractor in London, Ontario, I cannot overstate the importance of the exterior water supply provisions for our clients in Muskoka and Oakville. Properly installed frost-proof hydrants and individual fixture valving are not just about passing inspection; they are vital for preventing catastrophic pipe bursts during our harsh winters and simplifying long-term facility management for commercial properties."
Navigating the 2024 Building Code Compendium is essential for any successful build. At empcontracting.ca Inc. your construction contractor in London, Ontario, we prioritize compliance and quality in every plumbing installation. Section 7.6 covers the critical requirements for water supply systems, valving, and water efficiency.
Plumbing Valving and Metering Requirements
Water Supply to Tanks and Public Washrooms
Per OBC 7.6.1.3A and 7.6.1.3B, every pipe supplying a hot water tank, pressure vessel, or plumbing appliance must have a dedicated shut-off valve located close to the device. In public washrooms, the code requires that every fixture be individually valved and accessible, ensuring that maintenance can be performed without shutting down the entire facility.
Water Metering and Underground Piping
When water supply is metered, installations must strictly follow the water purveyor’s specific requirements. For underground plastic water service pipes, the end of the pipe must be brought between 300 mm and 450 mm above ground inside the building to ensure proper identification and transition.
Exterior Protection and Check Valves
Winter-Ready Exterior Water Supply
To prevent seasonal damage, OBC 7.6.1.4 requires that pipes passing through exterior walls be equipped with either a frost-proof hydrant or a stop-and-waste cock located inside the building. This is a critical step for durability in the Ontario climate.
Backflow Prevention
A check valve is mandatory at the building end of any water service pipe made of plastic intended for cold water use only, preventing potential contamination and maintaining system integrity.
Flushing Devices and Water Conservation
Modern standards emphasize efficiency. All flushing devices for water closets and urinals must deliver a volume of water sufficient for a thorough flush while adhering to the maximum water usage limits defined in the 2024 Compendium. In Group C occupancy buildings, these limits are strictly enforced to promote water conservation across Ontario.
Disclaimer: This content is generated from the Ontario Building Code for educational purposes. Always consult with a licensed professional engineer or your local building department before starting any construction project in London, Ontario.