Environmental Assessment Study

A Municipal Class Environmental Assessment (EA) is a five-phase study identifying the potential positive and negative effects of municipal infrastructure projects like road improvements as well as water and wastewater projects. The Ministry of the Environment, Conservation and Parks and the Municipal Engineers Association, in accordance with the Environmental Assessment Act, require that Regional and municipal governments perform a Class EA study before a project can begin.

The five phases of a Class EA are:

  1. Identify the problem and/or opportunity
  2. Identify and evaluate alternative solutions
  3. Identify and evaluate alternative design concepts to the preferred solution
  4. Prepare an Environmental Study Report
  5. Implementation

Depending on the EA Schedule, a project may not require going through all phases of the EA Process prior to implementation. Refer to Frequently Asked Questions for the list of Class EA Schedules.

The Class EA process includes an investigation and evaluation of the impacts on the natural, social and technical environment. A Class EA evaluates the impacts on natural and cultural features, infrastructure, traffic patterns, local residents and businesses in the community as well as existing and future land uses.

Current Class Environmental Assessment Studies

Last updated: October 2023

Please select a municipality to view current Environmental Assessment projects.

Accessible formats or communication supports are available upon request by contacting:
York Region Transportation, Public Works
Phone: 1-877-464-9675 ext. 75000 
TTY: 1-866-512-6228 
Email: @email

Aurora

Henderson Sewage Pumping Station Environmental Assessment and Open House

York is initiating a Schedule B Municipal Class Environmental Assessment (Class EA) study to determine the preferred approach to redirecting the wastewater flows from the Henderson Drive area in the Town of Aurora.

Yonge Street Aquifer Well Capacity Restoration

In 2016, The Regional Municipality of York completed a Schedule B Municipal Class Environmental Assessment (Class EA) study to identify a recommended plan to restore the full permitted capacity of York Region’s wells within the Yonge Street Aquifer.

Since the completion of the Class EA, additional updates were recommended to improve the overall distribution system water quality, requiring an addendum to the 2016 Project File.

East Gwillimbury

Upper York Sewage Solutions

Proposes a Water Reclamation Centre with associated infrastructure including an outfall to the East Holland River. York-Durham Sewage System Modifications are now part of a Declaration Order.
Status: Submitted to MOECC July 25, 2014

Learn more

Mount Albert Water Supply Upgrades

Study to identify improvements to the water supply system and water quality in the community of Mount Albert. 

Yonge Street Aquifer Well Capacity Restoration

In 2016, The Regional Municipality of York completed a Schedule B Municipal Class Environmental Assessment (Class EA) study to identify a recommended plan to restore the full permitted capacity of York Region’s wells within the Yonge Street Aquifer.

Since the completion of the Class EA, additional updates were recommended to improve the overall distribution system water quality, requiring an addendum to the 2016 Project File.

Georgina

No current projects

King

Water and Wastewater Servicing in the Nobleton Community

York Region is initiating a Schedule C Municipal Class Environmental Assessment (Class EA) study to identify long-term water and wastewater capacity servicing options for the Nobleton community that support growth and optimize the use of existing Regional infrastructure.

Learn more

Markham

Warden Avenue and Kennedy Road from Major Mackenzie Drive to Elgin Mills Road

Construction Starts: 2023 to beyond 2029
Estimated Study Completion: December 2023

Newmarket

Upper York Sewage Solutions

Proposes a Water Reclamation Centre with associated infrastructure including an outfall to the East Holland River. York-Durham Sewage System Modifications are now part of a Declaration Order.
Status: Submitted to MOECC July 25, 2014

Learn more

Yonge Street Aquifer Well Capacity Restoration

In 2016, The Regional Municipality of York completed a Schedule B Municipal Class Environmental Assessment (Class EA) study to identify a recommended plan to restore the full permitted capacity of York Region’s wells within the Yonge Street Aquifer.

Since the completion of the Class EA, additional updates were recommended to improve the overall distribution system water quality, requiring an addendum to the 2016 Project File.

Richmond Hill

Elgin Mills Road from Yonge Street to East of Newkirk Road

Estimated Study Completion: December 2023

Vaughan

Langstaff Road from Weston Road to Highway 7

Study Completion: January 2022

Northeast Vaughan Water and Wastewater Service

In 2019, York Region completed a Municipal Class Environmental Assessment (Class EA) study to establish the preferred solution to provide new water and wastewater infrastructure for the anticipated growth in northeast Vaughan. 

As a result of the study, the construction of two elevated water storage tanks, two water pumping stations, watermains associated with the storage tanks and pumping stations, and a new gravity trunk sewer network were identified as the preferred solution. Following further consultation, the Class EA was amended. 

Teston Road IEA from Highway 400 to Bathurst Street

Estimated Study Completion: Winter 2024

Whitchurch-Stouffville

Ballantrae Water - Long-term Water Supply

Schedule ‘B’ Class Environmental Assessment (Class EA) study to better understand if the existing water supply and storage capacity in the Ballantrae-Musselman Lake area will meet the long-term water needs of the community.

*A person may request the Minister of the Environment, Conservation and Parks issue a Part II Order. As of July 1, 2018, a Part II Order Request Form must be used to request a Part II Order. The Part II Order Request Form is available online on the Forms Repository website by searching “Part II Order” or “012-2206E” (the form ID number).

Stouffville Long-term Water Supply and Servicing

To better understand the impacts and requirements of an increase in water supply and storage capacity, York Region is conducting a Municipal Class Environmental Assessment (Class EA). The goal is to review the long-term water supply and storage needs for the community of Stouffville water system and the needs of York Region.

Planned Construction Schedule Map

View York Region’s 2024 Construction Schedule Map for planned and approved infrastructure projects.


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