A credit reduces the stormwater charge for a multi-residential or non-residential property. You can apply for a new credit, update an approved credit, or renew a credit that’s about to expire.
The property owner must be able to show how stormwater management best practices were implemented to reduce impacts to the City’s stormwater management system. Usually by controlling the quantity and quality of stormwater leaving your property.
Categories and evaluation criteria
You must provide engineering reports and drawings that show how well your stormwater best management practices perform. Your best management practices will be measured against these four categories and evaluation criteria:
Peak flow reduction
Manage stormwater runoff rates and reduce the potential and severity of flooding on downstream land. This could include drainage inlet controls, underground chamber systems, stormwater basins or ponds.
Water quality treatment
Remove solids and other contaminants from stormwater runoff. This could include a stormwater pond, oil and grit separators or green infrastructure.
Runoff volume reduction
Promote the reduction of the amount of stormwater runoff to the City’s stormwater system. This could include green infrastructure such as bioretention, infiltration, permeable pavements or rainwater harvesting systems.
Prepare and implement a plan for the handling, replacement or reduced use of harmful materials created or used on a property.
Stormwater credit amounts
The total stormwater credit cannot exceed 50%.
|Credit category||Evaluation criteria||Maximum credit amount (percentage)|
|Peak flow reduction||Per cent reduction of the 100 year post-development flow to pre-development conditions of the site.||Up to 40%|
|Water quality treatment||Per cent of site (hard surface) receiving water quality treatment consistent with Provincial criteria for enhanced treatment.||Up to 10%|
|Runoff volume reduction||Per cent capture of first 15 mm of rainfall during a single rainfall event.||Up to 15%|
|Pollution prevention||Develop and implement a pollution prevention plan.||Up to 5%|
How to apply
You can apply for a new credit, update or renew an approved credit online, or by mail. It will take a minimum of four weeks for your application to be processed.
For detailed information about the application requirements and process, read the Stormwater Charge Credit Application Guidance Manual.
You’ll need to provide:
- The property’s full address
- Your business contact information and email
- Engineering reports and drawings that show how your property implemented stormwater management best practices
Reports and drawings must be prepared by a Professional Engineer registered in Ontario and qualified in municipal engineering and stormwater management.
Apply by mail
Complete the Stormwater Charge Credit Application Form and mail it to:
City of Mississauga
Transportation and Works
201 City Centre Drive, Suite 800
Mississauga, Ontario L5B 2T4
What happens next
When reviewing your application, we may contact you to conduct a site inspection of your property.
Once your application has been approved, we’ll notify you by mail.
Stormwater credits will be in effect for up to five years or as otherwise specified at
the time of credit approval. Credits will expire if they’re not renewed prior to the expiration date.
If you have any questions about the credits or the application process, please email us at email@example.com.