Managing Environmental Risk: Key Considerations for Purchasers in Property and Business Transactions

Managing Environmental Risk: Key Considerations for Purchasers in Property and Business Transactions

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Posted October 6, 2025

When purchasing property or a business in Ontario, environmental issues can present significant risks. If not identified and managed properly, these risks can result in substantial liabilities that extend well beyond closing. Unlike sellers, who may have certain disclosure obligations, purchasers remain bound by the principle of “buyer beware.” Taking a proactive approach to environmental due diligence is key to protecting your investment and avoiding unexpected significant costs.

The Doctrine of Caveat Emptor and “As Is” Clauses

The common law doctrine of caveat emptor (“buyer beware”) has long shaped property transactions in Ontario, including those involving environmental contamination. Courts have consistently emphasized that purchasers bear the responsibility of investigating the environmental condition of a property. If contamination is discovered after closing and the purchaser failed to conduct proper due diligence, they may be left to bear all or part of the remediation costs.

This risk is greater when the Agreement of Purchase and Sale contains an “as is” clause. Unless carefully negotiated, such clauses can make it difficult for purchasers to seek compensation from the vendor after closing. To manage this risk, “as is” clauses should be reviewed closely and drafted to account for the specific circumstances of the site and any potential contamination.

The Importance of Environmental Due Diligence

To address these risks, environmental due diligence should form a standard part of any acquisition strategy. Phase I and, where necessary, Phase II Environmental Site Assessments provide an opportunity to identify historical land uses, potential sources of contamination, and the scope of any issues present. These assessments, carried out by Qualified Persons, allow purchasers to properly evaluate liability and negotiate contractual protections.

Ignoring this process can have serious long-term financial and legal consequences for purchasers.

Records of Site Condition

In certain cases, purchasers may consider obtaining a Record of Site Condition (RSC). An RSC provides a formal summary of a property’s environmental status and, once filed, offers limited protection from environmental orders under Ontario’s Environmental Protection Act. RSCs are often required where land is being converted from a less sensitive use, such as industrial, to a more sensitive use, such as residential.

Continuing Liability for Contamination

A purchaser’s liability for environmental contamination extends beyond the closing of a property transaction. Even if the purchaser was not responsible for the initial contamination, they may still be held legally accountable as the new owner if they permit contaminants to migrate onto neighbouring properties or fail to take reasonable measures after discovering contamination.

This principle was affirmed in Sorbam Investments Ltd. v. Litwack, 2021 ONSC 5226, where the Court held a landowner liable for environmental harm despite not being the original polluter. In that case, the defendant acquired property with known contamination but did not take steps to remediate it, resulting in ongoing migration of pollutants to an adjacent property.

The Court found the landowner liable in both nuisance and negligence, awarding the plaintiff over $1.2 million for property value loss and engineering expenses. This decision underscores that purchasers who are aware of contamination must act reasonably to prevent further damage or risk substantial legal and financial consequences.

Michael S. Hebert, Practice Lead of the firm’s Environmental Law Group, represented the plaintiff in this case, providing our Environmental Law Group with firsthand experience in how courts evaluate liability in such circumstances.

Negotiating Environmental Protections and Risk

Given these risks, purchasers should carefully negotiate the environmental terms of the Agreement of Purchase and Sale. Purchasers should consider negotiating terms that require the seller to assume responsibility for remediation, provide clean environmental reports, or allow for conditions related to the purchaser’s due diligence.

Conclusion

For purchasers, environmental risks are both significant and complex. Purchasers should approach each transaction with a clear understanding of their legal obligations and potential liabilities. Engaging experienced legal counsel and environmental consultants early in the process is essential to conduct thorough due diligence, negotiate appropriate contractual protections, and mitigate future environmental liabilities.

Our Environmental Law Group welcomes further discussion on specific environmental due diligence strategies tailored to your unique property and business acquisition scenarios.

This blog post was written by Michael Hebert member of the Mann Lawyers Environmental Law team and Nathan Adams (primary author), member of the Mann Lawyers Business Law team and Environmental Law team. Michael can be reached at 613-369-0360 or at michael.hebert@mannlawyers.com and Nathan at 613-369-0380 or at nathan.adams@mannlawyers.com.

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Michael S. Hebert

Michael S. Hebert

I lead the environmental law practice group at Mann Lawyers LLP. I have been involved in either environmental law or commercial litigation for the past 35 years.  I have been fortunate to have been the counsel that initiated several groundbreaking environmental cases of national significance over the years.  I have extensive trial and appellate experience in environmental law and commercial litigation matters. I enjoy ongoing involvement in class actions, contaminated land and Brownfields sites, municipal planning and land development matters, due diligence in complex real estate transactions, renewable energy and off-set credits, clean tech, corporate and director’s liability and environmental appeals and approvals. I have also maintained an active commercial litigation practice in the areas of shareholder disputes, contract law, real estate law, construction, bankruptcy and insolvency.  I have served as an education lecturer for the Law Society of Ontario, the Canadian Bar Association, the Ontario Bar Association and several... Read More

Read More About Michael S. Hebert
Nathan Adams

Nathan Adams

As an Associate at Mann Lawyers specializing in corporate and environmental law, I bring a decade of experience in biodiversity research and international sustainable development, with work spanning Canada, the U.S., Malta, and Indonesia. Before law, I managed a global wildlife conservation research office, led research expeditions in Indonesian tropical rainforests, and contributed to wildlife conservation as a published scientist.  I also served as a Senior Project Officer at the United Nations Association in Canada, where I secured green economy jobs and placements for youths at United Nations agencies worldwide. I have a Bachelor of Science in Earth Systems (Magna Cum Laude, University of Malta), a Master of Environmental Science (University of Toronto, Rotary Scholarship Funded), and a Juris Doctor (Cum Laude, University of Ottawa). During law school, I interned with Senator Pierre J. Dalphond focusing on Indigenous legal issues and led the University of Ottawa’s Environmental Law Students’ Association.... Read More

Read More About Nathan Adams