COVID-19: latest updates on the City's response and service impacts
Stormwater Residential Charge


Residential homes fall into one of the following categories: single detached, semi-detached, freehold townhomes and row houses. While they may look different, there are characteristics which allow them to be sorted into tiers to determine their stormwater charge.

How Will it Work?

Each property in the city will receive a stormwater assessment. The calculation for the stormwater charge is the same for all properties. Charges are calculated by multiplying the stormwater rate by the number of stormwater billing units assessed for that property. The stormwater rate is subject to approval by Council and will be reviewed each year as part of the City’s annual business planning and budget process.

The number of billing units assigned to a single residential property is determined by the tier it falls into. Each property is assigned to one of five tiers (smallest to largest) based on the total rooftop area of the property which is used as a predictor of the total hard surface area on that property. For example, single residential properties in the "medium" tier are assigned one billing unit (267m2) which represents the average hard surface area found on a single detached residential property in Mississauga.

Tier Property Size and Type Rooftop Area in m2 Estimated Fees Per Year Percentage of Homes
Smallest Freehold townhomes and row houses 26.7 - 99.0 $54.10 10%
Small Semi-detached homes, linked homes and small single detached homes 99.1 - 151.0 $75.74 40%
Medium Medium single detached homes 151.1 - 194.0 $108.20 30%
Large Large single detached homes 194.1 - 242.0 $129.84 15%
Largest Very large single detached homes 242.1 and above $183.94 5%

*Rooftops under 26.7 m2: no charge

Learn more about how charges are calculated.

Why Rooftop Area is the Indicator of Hard Surface

For residential properties, rooftop area is the most reliable indicator to measure hard surface area. The City did an extensive exercise measuring all the hard surfaces on a sample of residential properties: rooftops, driveways, patios, and any other hard surfaces. The City found that rooftops are the largest contributor to total hard surface area on a residential property and that there is a strong correlation between the rooftop area and total hard surface areas. Though driveways and other hard surface areas may vary in size from home to home, those variations are small in comparison to the total hard surface area.

The stormwater charge will be added to the Region of Peel water bill beginning in 2016. The total annual stormwater charge for a property will be divided into a daily rate. Each bill will show the stormwater charge for the number of days that have passed since the last bill. Bills will be sent on the same schedule as they are today. As the number of days billed may vary from bill to bill, and charges are accrued daily, you may see varying stormwater charge amounts on each bill.

Estimate your Charge

The estimator tool gives you an estimate of your property's annual stormwater charge and daily rate based on your address.

Managing Stormwater on your Property

An Outreach and Education Program for residential properties is being provided to recognize and support homeowners in their efforts to improve stormwater practices on their property.

Educational material and information is available through the City’s Environmental Services Section to understand how a property drains, what practices homeowners can implement to reduce the risk of flooding and what actions homeowners can take to reduce water quantity and improve quality in the City’s stormwater system. There are many existing programs for residential properties available through other City initiatives, the Region of Peel, local conservation authorities, public agencies and not-for-profit organizations. Learn more about these programs for your property.

Report an Error in your Stormwater Assessment

Assessments are created by staff using technical mapping software along with aerial images to digitally measure hard surface areas. Property owners may report an error in their stormwater assessment, such as mis-measurement of hard surface area or the categorization of a single residential home as non-residential. Staff may review and adjust existing digital measurements. Site visits are not part of the review process. Assessments will not be reviewed based on: the ratio of hard surface area to total property area, soil types or individual stormwater measures like disconnected downspouts.

You may request a review of your assessment online or use the request for review form.

Please note, the most current assessment for the property will apply and a review may not result in a lower charge.

Subsidy for Low-Income Seniors and Persons
with Disabilities

Low-income seniors and low-income persons with disabilities may be eligible for a subsidy to offset their stormwater charge. The subsidy is based on the City’s Tax Rebate Program and staff will use the existing property tax rebate process and eligibility to automatically identify property owners who will be eligible.

Residents who submit their tax rebate applications before December 31st, 2016 will have their stormwater subsidy backdated to January 1st, 2016. Please note that tax rebate applications must be submitted to Revenue & Taxation.

Residential Program Workshops

On April 13, 2016 staff held two public workshops to collect input on potential options for programs that would recognize and encourage stormwater best management practices on residential properties. Thank you to the nearly 200 Mississauga residents who participated and offered their ideas.

The workshop focused on table top discussions about the following two questions:

  1. How do you think the City should recognize homeowners who take steps to manage stormwater and reduce the risks of flooding on their properties?
  2. What type of resources and guidance do you think would help homeowners take steps to manage stormwater and reduce the risks of flooding on their properties?

Ideas and suggestions from participants were documented by table facilitators and will be considered by the working committee, along with emails we received after the workshop, to form recommendations that will come forward in a public report to General Committee of Council.

Learn More


For more information call 3-1-1 or 905-615-4311 outside city limits. Monday to Friday from 7 a.m. to 7 p.m.