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Municipal Class Environmental Assessment Studies


Municipalities in Ontario follow the Municipal Class Environmental Assessment (October 2000, amended 2007, 2011, and 2015) process under the Ontario Environmental Assessment Act to complete a Municipal Class Environmental Assessment (EA) for most transportation, water and wastewater projects. The Municipal Class EA is a phased planning approach that includes 5 main study phases and public consultation. The complexity and extent of the environmental impact of a specific project determines the number of phases to be completed to comply with the Class EA process.

The 5 phases are as follows:

  • Phase 1 - Problem or Opportunity:  The completion of this phase requires the proponent to document the factors that lead to the conclusion that an improvement or change is warranted.
  • Phase 2 - Alternative Solutions:  In this phase, alternative solutions to the problem or opportunity are identified and evaluated, taking into account the existing environment. A recommended preferred solution can be developed with input from the public and review agencies. The nature of the solution will determine if the proponent is required to complete additional phases of the Municipal Class EA process.
  • Phase 3 - Alternative Design Concepts for Preferred Solution:  If required, this phase will examine alternative methods of implementing the preferred solution, again considering environmental impacts and public and review agency input.
  • Phase 4 - Environmental Study Report:  This phase includes the preparation of an Environmental Study Report that documents the rationale and planning and consultative process undertaken for the project and the publication of the report for public review.
  • Phase 5 - Implementation:  This is the implementation phase of the Municipal Class EA process. This phase allows for design and construction of the items as planned in earlier phases, and monitoring for compliance with those planning principles.

Municipal Class EA projects fall into 1 of the 3 following Schedules depending on the potential environmental impact of the project:

  • Schedule A projects generally include normal or emergency operational and maintenance activities. Since the environmental effects of these activities are usually minimal, the projects are pre-approved and can proceed immediately to implementation.
  • Schedule B projects generally include improvements and minor expansions to existing facilities. Since there is potential for some adverse environmental impacts, the proponent must proceed through a screening process including consultation with those who may be affected.
  • Schedule C projects generally include the construction of new facilities and major expansions to existing facilities. These projects proceed through the complete environmental assessment planning process outlined in the Municipal Class EA before proceeding with construction.

Public Information Centres

Public consultation takes place through Public Information Centres where comments and concerns are identified and discussed. These meetings are advertised in local newspapers and online at 

Part II Orders

30-day public and agency review is advertised in local newspapers and online at as part of the Notice of Study Completion. Any outstanding comments and concerns must be provided to the proponent during this time. If concerns regarding this project cannot be resolved through discussion with the Region, a person or party may request that the Minister of Environment, Conservation and Parks order the project to comply with Part II of the Environmental Assessment Act (referred to as a Part II Order), which addresses individual environmental assessment. The Ministry's Part II Order Request Form may be downloaded at (external link).

Requests for a Part II Order must be recieved by the Minister and Region in writing through the completed form within 30 days of the Notice of Study Completion being issued.

View Halton Region Transportation Development and Non-Development Capital Implementation Plan (2018-2013) (PDF file).

Search EA Studies:

Project Name Municipality Status
Guelph Line (Regional Road 1) at Harvester Road/Queensway Drive Intersection Improvements Burlington On-going
Junction Street Wastewater Pumping Station Class EA Study Burlington Completed
Waterdown-Aldershot Transportation Master Plan - Phase 2 Burlington Completed
Acton Wastewater Treatment Plant Municipal Class EA Study Halton Hills Completed
Fourth Line Well Field Expansion Class EA Study Halton Hills Completed
John Street Wastewater Pumping Station Class EA Study Town of Halton Hills Halton Hills Completed
Ninth Line Corridor Study – Highway 407 to 10 Side Road Halton Hills Completed
Prospect Park Well Field Re-Rating and Water Purification Plant Expansion Halton Hills Completed
Trafalgar Road Corridor Study - Steeles Avenue to Highway 7 Halton Hills Completed
Winston Churchill Boulevard from Highway 401 to Embleton Road/5 Side Road Halton Hills On-going
Britannia Road Transportation Corridor Improvements Milton Completed
Derry Road Municipal Class Environmental Assessment Milton Completed
Guelph Line Municipal Class Environmental Assessment Milton Completed
New Wastewater Forcemain Municipal Class EA Study Milton Completed
Regional Road 25 Corridor Study – Steeles Avenue to 5 Side Road Milton On-going
Steeles Avenue Corridor Study – Tremaine Road to Industrial Drive Milton On-going
Burloak Water Purification Plant Phase 2 Municipal Class Environmental Assessment Oakville Completed
Dundas Corridor Study - Brant St to Bronte Rd Oakville Completed
Navy and Water Street Wastewater Pumping Stations & Collection System Class EA Study Oakville Completed
Ninth Line Corridor Study – Dundas Street to 407 ETR Oakville On-going
North Oakville Transportation Corridor & Sixteen Mile Creek Crossing Oakville Completed
Oakville Water Purification Plant Municipal Class Environmental Assessment Oakville Completed
Trafalgar Road Corridor Study (Oakville) Oakville Completed
Upper Middle Road Transportation Corridor Municipal Class Environmental Assessment Oakville Deferred
West River Wastewater Pumping Station Class EA Study Oakville On-going