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The Official Site of The City of Markham

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Use these helpful videos to understand backflow prevention.

Videos: Backflow Prevention Program for ICI and multi-residential properties

1. Markham's Distribution System



2. Cross Connection and Backflow



3. Historic Backflow Incidents from ICI Properties



4. Backflow Preventer



5. Backflow Prevention Program for ICI and Multi-residential Properties



6. Typical Cross Connections at ICI Properties



7. Closing Words



Videos:Backflow Prevention Program for Single Residential Properties

1. Historic Backflow from Residential Properties



2. Markham's Backflow Prevention Program for Residential Properties



3. What Can I do to Prevent Backflow Inside My House


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