Apply for a storm sewer connection approval

You can apply for approval to get storm drains on your property connected to the City’s storm sewer network.

How to apply

You’ll need to provide a PDF copy of your site plan. Site plans must be stamped by a Professional Engineer or the Association of Ontario Land Surveyors. The site plan must show:

  • Pipe diameter, length and slope
  • Basement floor elevation
  • Elevation of storm sewer

For residential properties, the basement elevation must be 1 metre higher than the connecting storm sewer. This elevation must be verified. If not, a sump pump is the suggested method for drainage.

With commercial properties, methods to control stormwater that delay flow into watercourses must be in place. Examples include roof control, underground storage tanks and lot ponding.

Email your completed application to

How to pay your fees

  • Call us at 905-615-4950 to pay by credit card over the phone.
  • Visit the Transportation and Works Permit Administration Services office to leave a draft/certified cheque in the designated drop box.

Permit Administration Services (ground floor)
Transportation and Works
3185 Mavis Road
Mississauga, ON L5C 1T7

Open Monday to Friday from 9 a.m. to noon and 1 p.m. to 3 p.m.

Contact us

For more information, please call 311 (905-615-4311 outside City limits) or email