Markham has a Sewer Use By-law in place to protect our sewer system and our source water.

Why Does Markham Need a Sewer Use By-Law?

Markham's Sewer Use By-law protects sewer systems, streams, and lakes. The by-law also limits the discharge of substances that may:

• Impact the safe operation of Markham’s sewers
  
• Adversely affect public health, property, or the environment

Markham's Sewer Use By-law 2014-71 (PDF)

Who enforces the Sewer Use By-law?

Markham's Waterworks Department ensures compliance. It monitors and samples discharges into Markham's sewers. The by-law applies to all discharges. These include:

• Residential properties
  
• Industrial properties
  
• Commercial properties
  
• Institutional properties