Location
St. Catharines Ward 4, St. Patrick’s. Bordered by Ontario Street, Pleasant Avenue, and Twelve Mile Creek.
Ward 4 public record
The Ontario Street Brownfield
Vacant for 16 years, and counting.
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Vote Higginson for St. Patrick's · A Community Voice · St. Catharines Ward 4
282–285 Ontario Street & 10 Pleasant Avenue
One site. A long record.
A source-linked chronology of the former GM property and the Ontario Street Corridor Secondary Plan.
Size
Approximately 20 hectares (50 acres).
History
General Motors powertrain manufacturing facility. Closed 2010. Demolition began 2017.
Status
Vacant, partially demolished, contaminated, and privately owned.
Ownership note: Ontario land-registry records identify 2390541 Ontario Inc. as the registered owner. Public statements have described Celernus Investment Partners as mortgage holder or site manager.
The site is adjacent to Twelve Mile Creek in the Twelve Mile Creek watershed.
The challenge and the opportunity
A site this important cannot stay invisible.
The public chronology
Published chronology
Follow the documented record from the plant closure to today.
Public record2026
2026
Retention pond overflows during storm
During the August 2 storm, the stormwater retention pond on the property overflowed across the property line, with the on-site filtration system offline since 2023; the Province subsequently asked the owner for stormwater sampling and an engineering assessment of the site's stormwater capacity.
Sources: The Pointer2026
Owner appeals to Superior Court
The registered owner filed a notice of appeal of the Property Standards Committee's decision to the Ontario Superior Court of Justice, asking that the orders be rescinded or the compliance deadline extended to June 30, 2027; a hearing was scheduled for August 13, 2026 at the St. Catharines courthouse.
Sources: CBC News · Global News2026
Committee upholds the orders
The City's Property Standards Committee heard the owner's appeal, confirmed the orders as issued, dismissed the appeal on a 2–1 vote, and extended the compliance deadline by 120 days to October 23, 2026.
Sources: Global News · City of St. Catharines Property Standards Appeal Committee2026
Owner appeals the orders
The registered owner appealed the May 22 orders to the City's Property Standards Committee; the City stated no further enforcement action would be taken until the appeal was heard.
Sources: Global News · 610 CKTB2026
City issues Property Standards Orders
Following resident complaints about open doors and gates, the City issued two Property Standards Orders — one for each side of Ontario Street — requiring the owner to repair, replace, or demolish unsafe structures, secure the buildings, and remove debris by June 12, 2026; the orders address surface structures and safety, not soil or groundwater contamination.
Sources: CBC News · 610 CKTB2026
City sets compliance deadline
The City set a December 31 deadline for the owner to address safety and environmental concerns, including remediation, removal or repair of unsafe structures, secure utilities and improved site security.
Sources: City of St. Catharines status page2026
Open house for secondary-plan visioning
The City held a public open house and invited community input on the future of the Ontario Street corridor.
Sources: Ontario Street Corridor Secondary Plan Study2026
Secondary-plan background report published
The City published background work addressing redevelopment opportunities, infrastructure needs and the planning context for the corridor.
Sources: Ontario Street Corridor Secondary Plan Study2026
Council considers overhead catwalk
Two councillors introduced a motion asking for a structural review of the overhead catwalk and remedial action by December 2026. Council deferred the motion.
Sources: The Pointer2026
Residents submit a petition
A petition with 1,077 signatures asked the City to enforce vacant-building and property-standards requirements at the site.
Sources: The Pointer2026
Stormwater sampling update
A consultant’s sampling reported no PCBs detected in one containment pond and cautioned that the testing was not exhaustive or a finding that the facility was risk-free.
Sources: City of St. Catharines status pagePublic record2025
2025
Council records declarations of interest
Two councillors declared interests following a closed session concerning a request for environmental-monitoring information.
Sources: The Pointer2025
Municipal authority questioned publicly
Public discussion focused on what authority the City could use to address conditions at the privately owned property.
Sources: The Pointer · Municipal Act, 20012025
Filtration system reported offline
Provincial ministry correspondence reported that the on-site filtration system was not operating.
Sources: The Pointer2025
Demolition permits revoked
The City revoked active demolition permits after prolonged inactivity at the site.
Sources: The Pointer2025
Construction lien filed
A contractor involved in remediation and stormwater work filed a $1.75-million construction lien for unpaid invoices.
Sources: The PointerPublic record2024
2024
IPC orders release of environmental records
Ontario’s Information and Privacy Commissioner ordered the City to release the Phase I and Phase II Environmental Site Assessments after an appeal process.
Sources: City release and assessments2024
Secondary-plan work paused
The City paused the Ontario Street Corridor Secondary Plan work while planning staff focused on other mandated projects and priorities.
Sources: Ontario Street Corridor Secondary Plan StudyPublic record2023
2023
Filtration system not restarted
The temporary stormwater treatment system was shut down for winter and was not restarted afterward.
Sources: City of St. Catharines status page2023
Temporary stormwater system operating
A temporary system was reported to be capturing and treating surface runoff before discharge to the municipal sanitary sewer.
Sources: City of St. Catharines status pagePublic record2022
2022
Environmental records requested
A freedom-of-information request sought the environmental assessments. The City initially withheld the records under the statutory third-party information process; the decision was later appealed.
Sources: City release and assessments2022
Building and waste-law proceeding concluded
The registered corporate owner pleaded guilty to charges under the Building Code Act and the City’s Waste By-law.
Sources: City of St. Catharines status pagePublic record2020
2020
Site redesignated for mixed use
City Council adopted Official Plan Amendment 26, redesignating 282 and 285 Ontario Street from Employment to Mixed Use.
Sources: Ontario Street Corridor Secondary Plan Study2020
Council requests a cleanup committee
Council ratified a motion to establish a staff-and-resident committee to identify a path forward; the proposed committee was not formed.
Sources: The PointerPublic record2018
2018
Demolition work stops
Demolition and cleanup activity stopped, leaving the property partly demolished.
Sources: City of St. Catharines status pagePublic record2014
2014
Property transferred by General Motors
General Motors of Canada transferred the property to the corporation recorded as the registered owner.
Sources: CBC NewsPublic record2012
2012
Phase II environmental assessment completed
The assessment documented contaminants in soil and groundwater at concentrations above standards used for evaluating more sensitive future land uses.
Sources: Released Environmental AssessmentsPublic record2010
2010
Automotive production ends
General Motors ceased production at the Ontario Street facility.
Sources: City of St. Catharines status page2010
Phase I environmental assessment completed
The assessment identified areas of potential environmental concern associated with the site’s long industrial history.
Sources: Released Environmental Assessments