This consultation was open from:
November 14, 2025
to December 29, 2025
Decision summary
The ministry has issued an amended Environmental Compliance Approval (ECA) to Ontario Power Generation Inc. for stormwater management works associated with the Phase II Pickering Waste Management Facility (PWMF) located at 1675 Montgomery Park Road, in the City of Pickering, Regional Municipality of Durham, Ontario.
Location details
Site address
1675 Montgomery Park Road
Lots 17, 18 19, 20, 21, Range 2
City of Pickering,
ON
L1V 2R5
Canada
Site location details
Pickering Nuclear Generating Station
Site location map
The location pin reflects the approximate area where environmental activity is taking place.
View this location on a map opens link in a new windowProponent(s)
Ontario Power Generation Inc.
1675 Montgomery Park Road
Pickering,
ON
L1V 2R5
Canada
Decision details
The ministry has issued an amended Environmental Compliance Approval (ECA) to Ontario Power Generation Inc. for stormwater management works associated with the Phase II Pickering Waste Management Facility (PWMF) located at 1675 Montgomery Park Road, in the City of Pickering, Regional Municipality of Durham, Ontario.
The proposed stormwater management works will service two additional storage buildings referred to as the Pickering Component Storage Structure (PCSS) and Storage Building 5 (SB5), as well as a proposed Security Kiosk building and the Common Services Building (CSB) and consist of series of storm sewers, ditches, catch basin/catch basin maintenance holes, two Jellyfish filters and storage swales and underground pipe storage. The stormwater will be discharged to Lake Ontario using an existing outfall.
Effects of consultation
No comments were received.
Supporting materials
View materials in person
Some supporting materials may not be available online. If this is the case, you can request to view the materials in person.
Get in touch with the office listed below to find out if materials are available.
230 Westney Road South
Floor 5
Ajax,
ON
L1S 7J5
Canada
How to Appeal
This instrument decision can be appealed. You have 15 days from March 31, 2026 to begin the appeal process.
Carefully review the information below to learn more about the appeal process.
How to appealClick to Expand Accordion
Start the process to appeal
If you’re an Ontario resident, you can start the process to appeal this instrument decision.
First, you’ll need to seek leave (i.e. get permission) from the relevant appellate body to appeal the decision.
If the appellate body grants leave, the appeal itself will follow.
Seek leave to appeal
To seek leave to appeal, you need to do these three things:
- prepare your application
- provide notice to the minister
- mail your application to three parties
1. Prepare your application
You’ll need to prepare an application. You may wish to include the following things in your application:
- A document that includes:
- your name, phone number, fax number (if any), and/or email address
- the ERO number and ministry reference number (located on this page)
- a statement about whether you are a resident in Ontario
- your interest in the decision, and any facts you want taken into account in deciding whether you have an interest in the decision
- the parts of the instrument that you’re challenging
- whether the decision could result in significant harm to the environment
- the reason(s) why you believe that no reasonable person – having regard to the relevant law and to any government policies developed to guide decisions of that kind – could have made the decision
- the grounds (facts) you’ll be using to appeal
- the outcome you’d like to see
- A copy of the instrument (approval, permit, order) that you you are seeking leave to appeal. You’ll find this in the decision notice on the Environmental Registry
- Copies of all supporting documents, facts and evidence that you’ll be using to appeal
What is considered
The appeal body will consider the following two questions in deciding whether to grant you leave to appeal:
- is there is good reason to believe that no reasonable person, with respect to the relevant law and to any government policies developed to guide decisions of that kind, could have made the decision?
- could the decision you wish to appeal result in significant harm to the environment?
2. Provide your notice
You’ll need to provide notice to the Minister of the Environment, Conservation and Parks that you’re seeking leave to appeal.
In your notice, please include a brief description of the:
- decision that you wish to appeal
- grounds for granting leave to appeal
You can provide notice by email at minister.mecp@ontario.ca or by mail at:
College Park 5th Floor, 777 Bay St.
Toronto, ON
M7A 2J3
3. Mail your application
You’ll need to mail your application that you prepared in step #1 to each of these three parties:
- appellate body
- issuing authority (the ministry official who issued the instrument)
- proponent (the company or individual to whom the instrument was issued)
Ontario Power Generation Inc.
1675 Montgomery Park Road
Pickering,
ON
L1V 2R5
Canada
Registrar, Ontario Land Tribunal
655 Bay Street, Suite 1500
Toronto, Ontario
M5G 1E5
(416) 212-6349
(866) 448-2248
OLT.Registrar@ontario.ca
Include the following:
This is not legal advice. Please refer to the Environmental Bill of Rights for exact legal requirements. Consult a lawyer if you need help with the appeal process.
Connect with us
Contact
Client Services and Permissions Branch
135 St Clair Ave West
1st Floor
Toronto,
ON
M4V 1P5
Canada
Original proposal
Proposal details
This proposal is for an amendment to the Environmental Compliance Approval (ECA) No. 7792-DGWK9H to support the expansion of the stormwater management system associated with the Phase II Pickering Waste Management Facility (PWMF) to accommodate two additional storage buildings referred to as the Pickering Component Storage Structure (PCSS) and Storage Building 5 (SB5), as well as the proposed Security Kiosk building.
The stormwater facility expansion includes an area of approximately 6.4 hectares that will consist of impervious area and be serviced by a series of storm sewers, ditches, catch basin/catch basin maintenance holes, and two Jellyfish filters on lands located at 1675 Montgomery Park Road, in the City of Pickering, Regional Municipality of Durham, Ontario. The stormwater will be discharged to Lake Ontario using an existing outfall.
Amendment of the ECA is also required to remove stormwater features described in the existing ECA that were not installed as part of the last PWMF – Phase II expansion. This was due to the cancellation of the previously planned Processing and Amenities Building. As a result, the stormwater features associated with these previously planned buildings were not installed.
Supporting materials
View materials in person
Some supporting materials may not be available online. If this is the case, you can request to view the materials in person.
Get in touch with the office listed below to find out if materials are available.
135 St Clair Ave West
1st Floor
Toronto,
ON
M4V 1P5
Canada
Comment
Commenting is now closed.
This consultation was open from November 14, 2025
to December 29, 2025
Connect with us
Contact
Client Services and Permissions Branch
135 St Clair Ave West
1st Floor
Toronto,
ON
M4V 1P5
Canada
Comments received
Through the registry
0By email
0By mail
0