Submit Environmental Impact Assessments - Mississauga

Land Use and Zoning Ontario 3 Minutes Read · published February 11, 2026 Flag of Ontario

Mississauga, Ontario requires Environmental Impact Assessments (EIAs) or Environmental Impact Studies (EIS) as part of many development and land-use applications to evaluate impacts on natural heritage, watercourses and regulated areas. Applicants should consult the City’s development application requirements early to confirm when an EIA is required, the expected scope, and the accepted submission method. The City coordinates review with Conservation Authorities and internal technical staff to confirm mitigation, monitoring and conditions.[1]

Prepare EIAs before detailed design to reduce review delays.

When an EIA is required

Typical triggers for an EIA in Mississauga include:

  • Major planning applications such as rezoning, site plan, subdivision or official plan amendments.
  • Development affecting significant natural heritage features, wetlands, woodlands or fish habitat.
  • Infrastructure or shoreline works near watercourses or regulated valleylands.
  • Situations identified during pre-consultation or by staff where additional studies are required.

Conservation Authorities (Credit Valley Conservation, Toronto and Region Conservation Authority) also require environmental studies for proposals within regulated areas and may set separate submission standards and permits.[3]

Penalties & Enforcement

Enforcement and compliance for EIA-related requirements in Mississauga is carried out by Planning and Building Services for development approvals and By-law Enforcement for municipal bylaw breaches. Conservation Authorities enforce their own regulations for development in regulated areas and may require restoration or remediation where unauthorized work occurs.[1]

  • Fine amounts and monetary penalties: not specified on the cited page.
  • Escalation for repeat or continuing offences: not specified on the cited page.
  • Non-monetary sanctions: orders to stop work, restoration orders, permit denial or conditions on approvals.
  • Enforcers and inspections: Planning and Building Services, By-law Enforcement, and Conservation Authority regulatory officers handle inspections and complaints.
  • Appeals and reviews: procedural appeals for planning approvals follow statutory planning appeal routes; specific time limits and procedures are set out in governing planning decisions or provincial legislation and are not specified on the cited City page.
Report unauthorized work immediately to the City or the local Conservation Authority.

Applications & Forms

The City publishes development application forms and submission requirements, including guidance on studies and any Terms of Reference for Environmental Impact Studies. Typical submission details include the EIS report, supporting maps, species surveys, and a cover letter identifying the application type. Specific form names and fees are listed on the City’s forms and fees page; fee amounts or a separate EIS application fee are not specified on the cited page.[2]

Follow the City’s forms checklist and the EIS Terms of Reference provided during pre‑consultation.

Action steps

  • Begin with pre-consultation with Planning staff to confirm scope and Terms of Reference.
  • Prepare the EIA/EIS to City and Conservation Authority standards, including maps and species data.
  • Submit the EIA as part of your development application package using the City’s prescribed submission method.
  • Respond to reviewer comments and provide revisions or mitigation plans as required.

FAQ

Who reviews EIAs in Mississauga?
Planning and Building Services reviews EIAs for development applications; Conservation Authorities review proposals in regulated areas.
How do I know if my project needs an EIA?
Consult the City’s development application requirements during pre-consultation; staff will identify required studies based on site conditions.
Where do I submit the EIA report?
Submit the EIA with your development application following the City’s forms and submission instructions.[2]
What if I start work without an approved EIA?
Unauthorized work may trigger enforcement actions, restoration orders or permit refusal; contact the City or Conservation Authority immediately.

How-To

  1. Request pre-consultation with City Planning to determine EIA scope and Terms of Reference.
  2. Retain qualified environmental consultants to complete the EIA to the agreed Terms of Reference.
  3. Compile the EIA report, appendices and maps, and attach them to your development application submission.
  4. Respond to City and Conservation Authority review comments and submit any required revisions.
  5. Obtain required permits and satisfy conditions before starting construction.

Key Takeaways

  • Confirm EIA requirements during pre-consultation to avoid delays.
  • Follow City and Conservation Authority Terms of Reference for accepted studies.
  • Use official City and Conservation Authority contacts for submissions and enforcement reports.

Help and Support / Resources

  1. [1] City of Mississauga - Development applications
  2. [2] City of Mississauga - Development application forms and fees
  3. [3] Credit Valley Conservation

Categories

General Governance and Administration Public Safety Public Health and Welfare Land Use and Zoning Housing and Building Standards Transportation Environmental Protection Parks and Public Spaces Business and Consumer Protection Taxation and Finance Labor and Employment Education Civil Rights and Equity Elections and Campaign Finance Events and Special Uses Signs and Advertising Utilities and Infrastructure Technology and Data