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Mississauga Storm Sewer Temporary Discharge Approval (dewatering)
Approval under the Storm Sewer Use By-law 0046-2022. Construction dewatering may go to a municipal storm sewer only with a valid permit and fees paid [MISS].
You need it when: Temporarily discharging groundwater or surface runoff (e.g. construction dewatering) to a Mississauga storm sewer.
Why it's needed
- All discharges to the City storm system must meet the Storm Sewer By-law to protect downstream water quality [MISS].
When to apply
- Before dewatering. The approval needs lab analysis of water samples; coordinating it takes about 1–2 weeks [MISS].
- Developments also sign the Storm Sewer Use By-law Acknowledgement covering City and Region of Peel dewatering requirements [MISS].
- Discharges to sanitary sewers go to the Region of Peel instead.
Review time
Plan for about 10 business days. about 1–2 weeks [MISS]
Documents for a complete application
- Storm Sewer Temporary Discharge Approval form [MISS]
- Laboratory results of water quality samples [MISS]
- Hydrogeological report / dewatering plan and treatment details
- Storm Sewer Use By-law Acknowledgement (developments) [MISS]
How to submit
- Email env.inquiries@mississauga.ca [MISS].
Forms and guides
- Mississauga Storm Sewer Temporary Discharge Approval Form (City of Mississauga, application form)
- Mississauga Storm Sewer Use By-law 0046-2022 (City of Mississauga, by-law)
Official pages
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Sources are marked in the text: [TO] toronto.ca pages, [Guide] general industry guidance, [Plan] permit planning practice. Confirm on the official page before applying.