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Beaudry v. City of Montreal (Pierrefonds-Roxboro Borough) and City of Montreal is a proposed class action filed in the Superior Court of Quebec on behalf of all persons whose movable or immovable property in the Borough of Pierrefonds-Roxboro was damaged by flooding during an extreme rainfall event on June 20, 2026. The application alleges that approximately 100–170 mm of rain fell over a period of a few hours, overwhelming local drainage systems and causing extensive flooding of streets, homes, and vehicles. The plaintiff claims that many residences suffered significant water infiltration, including severe basement flooding. The proposed class consists of property owners and lessees affected by the flood, part of an estimated 1,000–1,500 households impacted across Montreal’s West Island.

The plaintiff alleges that the Borough of Pierrefonds-Roxboro and the City of Montreal negligently caused or exacerbated the flooding by failing to adequately prepare for, manage, and mitigate foreseeable extreme rainfall events. Specifically, the claim alleges that the defendants failed to increase stormwater storage capacity before the storm, failed to install or expand flood-adaptation infrastructure such as sponge parks, retention facilities, reservoirs, and catch basins, failed to undertake adequate emergency response measures during the flooding, and failed to upgrade and maintain aging sewer and drainage systems. 

The application further alleges that these failures occurred despite the defendants’ knowledge that climate change has increased the frequency and intensity of concentrated rainfall events. According to the claim, municipal authorities were aware that Pierrefonds-Roxboro's topography makes it particularly vulnerable to surface-water accumulation and had been on notice since the severe flooding associated with the remnants of Hurricane Debby in August 2024 that existing drainage infrastructure could not adequately handle major rainfall events. The plaintiff contends that the municipalities failed to implement appropriate adaptation measures despite being aware of these climate-related risks.

The plaintiff seeks compensatory damages for property demolition, disinfection, repairs and reconstruction, replacement of damaged personal property and vehicles, diminished property value, increased insurance costs, alternative living expenses, and health impacts associated with mold, fungus, and contamination. The plaintiff also seeks damages for pain and suffering, stress and anxiety, loss of enjoyment of life, punitive damages under the Quebec Charter of Human Rights and Freedoms, and injunctive relief requiring the defendants to undertake works aimed at preventing future flooding.


On June 20, 2026, the Montreal region experienced an extreme rainfall event that reportedly brought between 100 and 170 mm of rain within a few hours. According to the application, runoff water overwhelmed local drainage infrastructure in the City of Dollard-des-Ormeaux, causing streets to flood and resulting in extensive damage to homes and vehicles. The proposed class action lawsuit consists of all owners and lessees of movable or immovable property in Dollard-des-Ormeaux that was damaged by the flooding. The application estimates that between 1,000 and 1,500 households across Montreal’s West Island were affected by the event.

The proposed class action alleges that the City of Dollard-des-Ormeaux and the City of Montreal negligently caused or exacerbated the flooding by failing to adequately prepare for, respond to, and mitigate foreseeable extreme rainfall events. The plaintiff alleges that the defendants failed to take precautionary measures before the storm, including increasing available stormwater storage capacity; installing or expanding adaptation infrastructure such as retention ponds, retention facilities, catch basins, and sponge parks designed to absorb, detain, and gradually release rainwater; implementing adequate flood-response measures during the event, including water diversion, pumping, and blockage removal; and upgrading and maintaining aging sewer and drainage systems.

The application further alleges that these failures occurred despite the defendants’ knowledge that climate change has increased the intensity and concentration of rainfall events. According to the claim, the defendants knew that Dollard-des-Ormeaux was vulnerable to flood risk because of its topography and had been aware that existing sewer and drainage infrastructure could not adequately withstand major rainfall events following the severe flooding associated with the remnants of Hurricane Debby on August 9, 2024. The plaintiff contends that the municipalities therefore had notice of foreseeable climate-related flood risks and failed to undertake appropriate adaptation measures.

The plaintiffs allege that class members suffered common injuries resulting from the flooding, including damage to residential property and personal belongings, reduced property values, increased insurance costs or loss of insurance coverage, temporary relocation and other out-of-pocket expenses, and physical and mental harms associated with flood-related contamination. The action seeks compensatory damages, punitive damages under the Quebec Charter, and injunctive relief requiring the defendants to undertake infrastructure improvements and other measures intended to prevent future flooding.


On June 15, 2026, youth climate advocates Marie Maltais, Sophia Mathur, and Shirley Barnea, together with Environmental Defence Canada and the Canadian Association of Physicians for the Environment (CAPE), filed an application for judicial review in the Federal Court against the Minister of Environment, Climate Change and Nature and the Attorney General of Canada. The applicants allege that the Minister failed to comply with mandatory obligations under the Canadian Net-Zero Emissions Accountability Act (CNZEAA) by not amending Canada's 2030 Emissions Reduction Plan (ERP) after the federal government repealed, weakened, or substantially altered several of the plan's key emissions reduction measures.

According to the application, the 2030 ERP, adopted in 2022, described the federal measures intended to achieve Canada's statutory target of reducing greenhouse gas emissions by 40-45% below 2005 levels by 2030. The applicants argue that subsequent policy changes, including the elimination of consumer carbon pricing, the weakening of industrial carbon pricing, the repeal of the electric vehicle sales mandate, the cancellation of the proposed oil and gas emissions cap, delays to methane reduction requirements, and significant changes to clean electricity regulations, mean that the ERP no longer accurately describes the measures the government intends to implement and no longer provides a credible pathway to achieve the 2030 target.

The applicants rely in part on the Minister's 2025 Progress Report, which projected emissions reductions of only 21-28% by 2030 under existing and announced measures. They contend that the Minister was therefore required to initiate the statutory amendment process under the CNZEAA, which would update the ERP and trigger the public consultation process provided for under the Act. The application seeks an order of mandamus requiring the Minister to amend the ERP, or alternatively declarations that the current ERP and the Minister's failure to amend it are unlawful under sections 9(1) and 10(1)(b) of the CNZEAA.


On October 2025, a group of young Canadians sued the Canada Pension Plan Investment Board alleging the pension fund is mismanaging climate-related financial risks and failing to disclose and properly manage exposure to fossil fuel assets, thereby subjecting pension contributions to undue risk of loss from poorly managed climate risk. The complaint focuses on inadequate climate modeling/disclosure and fiduciary breaches. 

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