Sewer Discharge Permits and Agreements are required when private water (water not purchased from the City) is discharged into the City’s sewer system. Examples of private water include:

  • groundwater
  • surface water
  • construction dewatering
  • rainwater
  • stormwater

Discharge Permits and Agreements allow private water to be discharged into the sanitary, combined or storm sewer.

  • Discharge must meet the limits set in the Sewers By-law (See Table 1 for sanitary/combined limits; Table 2 for storm limits).
  • Restrictions to the volume and flow rates may be imposed by the City where warranted by conditions in the sewer.


Permits are issued when:

  • discharge activities will be completed within a short period of duration (generally, one year or less), and
  • the discharge fee will not exceed $20,000.

Examples of this type of activity include site remediation and construction dewatering.


Agreements are issued when:

  • discharge activities are long-term (perpetual), and
  • the discharge fee will exceed $20,000.

Agreements are granted for terms of up to one year and may be renewable. An example is discharge from a permanent private water drainage system.

  • Water discharged to the sanitary or combined sewer requires additional treatment. As such, applicants will be charged a separate fee based on the volume of water being discharged. See section 4 of the application for the current fee.
  • There is no fee for water discharged to the storm sewer; however, the limits set by the By-law for contaminants are stricter and must be met.

Completed applications must be submitted at least eight to 12 weeks prior to the proposed discharge start date. Incomplete applications may take longer to process.



Two copies of the application must be submitted: one by email and one by mail.

Attn: Toronto Water Environmental Monitoring & Protection

30 Dee Ave.
Toronto, ON M9N 1S9