This is the City of Markham’s document, as published on its website on 18 October 2026. The municipality may have changed it since: check the current version at the source. Legal notice
- Type
- By-law
- Published by
- City of Markham
- Date
- July 8, 2025
- Also called
- 2012-27
- For
- owner
- Signed by
- Town Clerk · Mayor
- Building types
- All building types
- Pages
- 15
- Instruments
- Municipal Act · Safe Drinking Water Act · Building Code Act, 1992 · Ontario Building Code · Ontario Fire Code · Provincial Offences Act · CAN/CSA B64.10-07/B64.10.1-07
Overview
Markham's Backflow Prevention By-law 2012-27, passed in February 2012 to regulate cross connections and backflow prevention in private plumbing systems connected to the City's drinking-water system, in a consolidation to July 8, 2025 that adds administrative monetary penalties under By-law 2025-54. It defines premise, source and zone isolation, refers to the CSA B64.10 standard, and sets out cross connection control surveys, backflow preventer testing and Preventer Test Reports, fire service main and private hydrant inspection, penalties and fees. Schedule A is the Authorized Functions List.
What it covers
- Definitions
- Application of By-law
- Prohibition of Cross Connections - Owner’s Responsibility
- Persons Permitted to Carry Out Cross Connection Control Work
- Application of CSA Standard
- Information Request Form Requirement
- Cross Connection Control Survey Requirement
- Testing of Backflow Preventers
- Corrective Actions on Cross Connection Control Deficiencies
- Installation of Backflow Preventers
- Removal of Backflow Prevention Devices Prohibited
- Maintenance of Fire Service Mains
- Administration and Enforcement
- Penalty Provisions
- Fees
- General Provisions
- Severability
- Schedules
- Interpretation
- Short Title
- Effective Date
- Authorized Functions List
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