Ontario Building Code Potable Water Standards: OBC 7.6.2 Cleaning and Backflow Prevention
Sarah's Expert Insight
OBC Compliance Specialist
"At empcontracting.ca Inc. your construction contractor in London, Ontario, we recognize that proper flushing and vacuum breaker placement are often overlooked during fast-paced renovations in Oakville and Muskoka. These OBC sections are vital for preventing cross-contamination, and our team ensures every potable system is rigorously tested and compliant before we hand over the keys to your new space."
Adhering to the 2024 Building Code Compendium is essential for ensuring the safety and longevity of plumbing systems. At empcontracting.ca Inc. your construction contractor in London, Ontario, we prioritize these standards to ensure every project meets the highest health and safety requirements.
OBC 7.6.2.8: Cleaning and Flushing Potable Water Systems
Before any newly installed potable water system is put into operation, it must be thoroughly cleaned and flushed with potable water. This prevents contamination from construction debris, solder flux, or bacteria, ensuring the water is safe for consumption from day one.
OBC 7.6.2.9: Air Gap Specifications for Contamination Prevention
Environmental and Height Requirements
Air gaps serve as a physical break between the water supply and potential contaminants. According to the OBC:
- Air gaps must never be located in a noxious environment.
- The gap must be at least 25 mm high or at least twice the diameter of the water supply outlet opening.
OBC 7.6.2.10: Professional Installation of Vacuum Breakers
Vacuum breakers are critical components in preventing back-siphonage. The 2024 code specifies strict installation parameters based on the 'critical level' of the device:
Atmospheric Vacuum Breakers
These must be installed on the downstream side of the control valve and are intended for intermittent use (not exceeding 12 hours of continuous pressure). The critical level must be at least 25 mm above the flood level rim or the highest point of an irrigation system.
Pressure and Spill-Resistant Vacuum Breakers
For higher-risk applications, these devices must be installed so that the critical level is at least 300 mm above the flood level rim or the highest point open to the atmosphere.
OBC 7.6.2.11: Tank-Type Water Closet Compliance
All tank-type water closets are required to have a back-siphonage preventer that conforms to OBC Section 7.2.10.10.(2). This ensures that water from the toilet tank cannot be pulled back into the clean water supply during a pressure drop.
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.