A Canadian business signs a lease on an industrial unit, or buys a commercial building, and treats environmental questions as a matter for the party that used chemicals on the site. That instinct is reasonable, widely held, and does not describe Canadian law. The operative question is not who caused the contamination but who owns or controls the land now.
Key Takeaway
Under Ontario's Environmental Protection Act, current and former owners can be held liable for contamination whether or not they actually caused it. In Hamilton Beach Brands Canada Inc v Ontario (2018 ONSC 5010, Div Ct), current owners and tenants were held liable for contamination caused by a former tenant decades earlier. In Midwest Properties Ltd v Thordarson (2015 ONCA 819), courts confirmed a willingness to pierce the corporate veil and hold directors and officers personally liable. Directors face personal fines up to $100,000 and potential imprisonment, liability for cleanup costs regardless of fault, and orders that issue regardless of corporate insolvency or prosecution. Parties with management, care or control, including secured creditors, can be caught. A Phase I assessment conducted to CSA Z768 supports an innocent purchaser defence under most provincial legislation, but only conditionally, costs roughly $3,000 to $8,000, and takes two to four weeks before any Phase II work begins.
The Misnomer At The Centre
The phrase that misleads more Canadian business owners than any other in this area is one they have heard approvingly.
Commentary notes that in Canada, strict environmental regulations and the principle of polluter pays make environmental site assessments a highly regulated process in property development[1]. The principle is real as a matter of policy. As a description of who ends up paying, it is unreliable, which is why one leading firm titles its treatment of the subject with the observation that the polluter does not always pay[2].
The statutory position in Ontario is stated directly: under the Environmental Protection Act, RSO 1990, c E.19, current and former owners of a property can be held liable for environmental contamination whether or not they actually caused it[3]. Commentary elsewhere puts the same point as landowners who purchase contaminated property being liable for the impacts resulting from contamination on their property despite not having caused it[2].
The rationale is administrative rather than moral. The party that caused contamination decades ago may be dissolved, untraceable, or without assets. The party that owns the land today is identifiable, present, and has an asset against which an order can be enforced. Regulators attach liability where remediation can actually be compelled.
For a business the consequence is that environmental risk is a property risk, not an operations risk. It arrives with the address rather than with the activity, and it arrives whether or not the business has ever handled a regulated substance.
Hamilton Beach: Tenants Pay Too
The decision that extends the exposure well beyond the population that expects it.
In Hamilton Beach Brands Canada Inc v Ontario (Environment and Climate Change), 2018 ONSC 5010 (Div Ct), with leave to appeal to the Court of Appeal denied, the current owners and tenants of a property were held liable for contamination that occurred at the hands of a former tenant decades earlier[3].
Three elements of that sentence deserve separate attention.
Tenants. Occupation without ownership was not a shield. A business that leases premises, has no interest in the land, and will vacate at the end of its term was nonetheless within the scope of liability. This is the single most under-appreciated point in the area, because the population of Canadian businesses that lease industrial or commercial space vastly exceeds the population that owns it.
A former tenant. The party that caused the contamination was neither the owner nor the current occupant. It was a predecessor in occupation, and its conduct became the current parties' problem.
Decades earlier. There is no practical limitation period operating in the way commercial parties expect. Contamination is a physical condition of the land that persists, and liability attaches to present control of that condition rather than to proximity in time to the act that created it.
The transferable instruction is that a business taking a lease on premises with any industrial history should treat environmental due diligence as part of the leasing decision, which is a step almost no Canadian tenant currently takes.
Midwest: The Veil Does Not Hold
The decision that removes the assumption most owner-managers rely on without examining.
As seen in Midwest Properties Ltd v Thordarson, 2015 ONCA 819, with leave to appeal to the Supreme Court denied, corporate ownership of a property will not necessarily protect individuals from being held personally liable. Courts are willing to pierce the corporate veil and hold directors and officers liable for environmental contamination pertaining to properties owned by their respective corporations[3].
Commentary reinforces how far this reaches: officers and directors are at risk of liability even when the responsible company is also liable and solvent[2].
That last qualification is the important one and it is easy to read past. In most areas of corporate law, personal liability is an exceptional remedy reached when the corporate route fails, whether because the company is insolvent or because the conduct was such that the separate personality should be disregarded. Here, the commentary describes personal exposure as available alongside a solvent corporate defendant.
The practical implication for owner-managers of Canadian businesses holding real property is that incorporation is not, on its own, an answer to this category of risk. A structure that isolates a property in a holding company protects the operating business from the property's liabilities. It does not, on this authority, reliably protect the individuals who direct the holding company.
Knew Or Ought To Have Known
The standard that converts passive ownership into active liability, and it is a low bar.
Commentary states that where a landowner knows or ought to have known of contamination and its migration but fails to address it, liability will arise[2]. The same source advises that as a landowner it is critical to understand the environmental risks arising from activities carried out at the property and to take proactive steps to investigate and remediate any potential concerns, and that prudent landowners not only react and remedy contamination once found but take proactive steps to prevent contamination that may spread to neighbouring lands[2].
Two features of the standard are worth drawing out, and this is our own analysis.
The constructive limb, ought to have known, means deliberate ignorance is not protective and may be worse than knowledge. A purchaser who declines an assessment precisely so as not to learn what it would reveal is not in a better position than one who investigated; the question becomes what a reasonable owner in the circumstances would have known.
And the trigger is failure to address rather than failure to have prevented. An owner who discovers contamination and takes appropriate steps is in a different position from one who discovers it and does nothing. That means the period after discovery is where an owner's conduct is actually assessed, which makes the response to a finding as consequential as the finding itself.
The reference to migration matters too. Contamination that spreads to neighbouring land creates exposure to those neighbours in addition to any regulatory consequence, which is the subject of a section below.
What Directors Personally Face
The specific exposure, set out because it is more severe than most directors assume.
Under provincial statutes like Ontario's EPA, directors and officers are required to take all reasonable steps to prevent environmental violations, including preventing spills, ensuring timely reporting of incidents, and complying with ministry orders. Failure to act can result in personal fines up to $100,000 and potential imprisonment, liability for cleanup costs regardless of fault, and orders issued regardless of corporate insolvency or prosecution[4].
Compare that with the personal exposure this publication has examined for unremitted source deductions and GST/HST. Both are duties running to individuals rather than to the corporation. Both attach regardless of whether the director personally handled the matter. The environmental version adds the possibility of imprisonment and, critically, adds liability for cleanup costs regardless of fault.
The phrase "regardless of fault" is doing significant work. It signals that the directors' duty is affirmative rather than merely a prohibition on wrongdoing: the obligation is to take all reasonable steps to prevent violations, which is a standard measured by what was done rather than by what was intended.
The practical consequence is that a director of a Canadian business occupying industrial premises should be able to point to steps taken. Not a belief that operations are clean, but a record: assessments obtained, incidents reported, orders complied with, and a system for identifying spills. Absence of a record is the exposure, because the defence is constructed from evidence of diligence and diligence that was never documented is difficult to establish afterwards.
Orders Survive Insolvency
A feature that distinguishes this liability from almost every other and that defeats a common assumption.
Orders may be issued regardless of corporate insolvency or prosecution[4].
The assumption this displaces is that a company's failure resolves its obligations. In the restructuring context this publication has examined, a stay of proceedings prevents creditors from enforcing, and a plan of arrangement compromises claims. Business owners reason, understandably, that a company which cannot pay cannot be made to remediate.
The commentary indicates otherwise, and the reason is conceptual. A remediation order is a regulatory requirement directed at a condition of land, not a monetary claim in an insolvency. Where personal liability attaches to directors, the insolvency of the corporation removes the party that might otherwise have performed the work while leaving individuals exposed.
We would put the sequencing point plainly. A director considering whether to wind down a business occupying contaminated premises should obtain environmental advice before insolvency advice, not after, because the exposures that survive the corporation are the ones that determine the individual's position and they are not addressed by choosing the right insolvency instrument.
Management, Care Or Control
The extension to parties who never occupied the site at all.
Investors and secured creditors are not immune from environmental responsibility. Courts across Canada have confirmed that parties with management, care or control over operations may be held liable for environmental remediation obligations. Whether financing equipment, acquiring distressed assets, or participating in turnaround strategies, businesses and investors must conduct environmental due diligence through Phase I and Phase II assessments and financial risk analysis relating to potential liabilities[4].
The test is functional. It asks what a party actually did in relation to operations rather than what its legal status was, which means a lender's exposure depends on its conduct rather than on the label in its security documents.
Three situations warrant particular care and each is common in Canadian mid-market finance. A lender that takes an active role in managing a distressed borrower's operations, which is precisely what a workout often involves. An investor acquiring distressed assets, where the attraction of the price may reflect an environmental condition the acquirer has not investigated. And a party appointing or directing management, which is a step frequently taken in the belief that closer oversight reduces risk.
The uncomfortable observation, which we offer as our own, is that increasing operational involvement in a distressed situation reduces credit risk and may increase environmental risk. Those move in opposite directions, and a lender optimising only for the first may be acquiring the second without pricing it.
An Order Is Not The End Of It
The dual exposure that businesses treating a regulatory order as the ceiling of their liability will miss.
A government order to remediate a property does not preclude a civil action for damages from owners of neighbouring properties that may be affected by the contamination[3].
So a business facing contamination on its site may face two entirely separate proceedings arising from one physical condition: a regulatory process requiring remediation to a prescribed standard, and civil claims from neighbours whose land or property values have been affected.
The two have different measures. Remediation is measured by the standard the regulator requires. Civil damages are measured by the loss to the claimant, which may include diminution in property value, loss of use, and costs the neighbour incurs, and which is not capped by what remediation costs.
This connects directly to the migration point above. Contamination confined to the owner's own land creates regulatory exposure. Contamination that has migrated creates both, and the second category can be the larger, particularly where affected neighbouring properties are valuable.
For an owner discovering contamination, the practical implication is that the question of whether it has migrated off-site is not merely technical. It determines the shape of the exposure, and it should be among the first things established.
The Phase I Assessment
The instrument at the centre of environmental due diligence in Canada, and what it actually is.
A Phase I reviews a commercial property's environmental history for contamination risks, is required by Canadian lenders, and follows CSA Z768 standards. It costs roughly $3,000 to $8,000 and takes two to four weeks[5]. Its components include a site visit, being a visual assessment to locate possible contaminating activities, and examination of records including title documents, aerial photographs and previous reports[6].
The consultant also tries to speak with current and former property owners, property managers, local government environmental officers and knowledgeable neighbours, and former owners are not always reachable or willing to talk, which can create gaps in the consultant's conclusions[5].
The critical structural point is that a Phase I is a records and observation exercise. Sampling is not part of it. That is what a Phase II adds, with results indicating the severity and scope of the contamination and whether remediation is necessary, while Phase III focuses on remediation and the development and implementation of a cleanup strategy, with ongoing monitoring potentially required afterwards[6].
In Ontario, Ontario Regulation 153/04 on Records of Site Condition sets out standards and requirements for Phase I and Phase II assessments, under the framework of the Environmental Protection Act[6]. Due diligence should be conducted by qualified environmental consultants, usually environmental engineers or geoscientists licensed and experienced in the applicable regulatory framework[6].
The financing dimension is worth noting because it often forces the issue: lenders often require assessments before approving loans, and without one, financing or refinancing may be denied[1]. BDC notes that most lenders require an environmental assessment of commercial property[7].
The Innocent Purchaser Defence Is Conditional
What a Phase I actually buys, stated with the qualification the source itself attaches.
Asked whether a Phase I protects against future environmental liability, one source answers that it does, with conditions: conducting a Phase I in accordance with CSA Z768 gives an innocent purchaser defence under most provincial environmental legislation[5].
Three qualifications sit inside that answer and each matters.
In accordance with CSA Z768. The defence is tied to the assessment meeting the standard. A cheaper, faster, non-conforming report may provide commercial comfort and no legal protection, which inverts the usual relationship between price and value in professional services.
Under most provincial legislation. Environmental regulation is primarily provincial, the statutes differ, and the availability and scope of any such defence must be confirmed in the applicable jurisdiction rather than assumed from a general statement.
With conditions. The defence is available to a purchaser who investigated appropriately and did not know of the contamination. Read against the knew-or-ought-to-have-known standard discussed above, the two fit together: the assessment is how a purchaser establishes what a reasonable investigation would have revealed, and a purchaser who obtained a Phase I disclosing a concern and proceeded without further investigation has knowledge rather than a defence.
The practical framing we would offer is that a Phase I is not insurance against contamination. It is evidence of diligence, and its protective value depends on being done properly and on what the purchaser does with what it finds.
RECs, CRECs And Data Gaps
The classification hierarchy that determines what happens next in a transaction.
A Phase I report classifies results using a specific hierarchy, and a clean Phase I has zero recognised environmental conditions, zero controlled recognised environmental conditions, and no unresolved data gaps. The moment a REC shows up, the lender will want a Phase II before committing to anything[5].
The data gap category is the one commercial parties handle worst, in our assessment, and it connects to the interview limitation noted above. Where former owners are unreachable or unwilling to speak, the consultant records a gap rather than a finding. A report with unresolved gaps is not a clean report; it is an incomplete one, and it does not support the same conclusions.
The lender behaviour described has a transaction consequence worth planning for. A REC does not merely add cost; it adds a second assessment and its timeline to a deal that has already consumed weeks, and it does so at the point where financing is contingent.
A purchaser reading a Phase I should therefore look first at whether gaps are recorded and what they concern, before reading the conclusions, because the conclusions are only as strong as the information that supported them.
What A Phase I Does Not Cover
A scope limitation that surprises purchasers who treat the report as a general environmental clearance.
Under the analogous United States standard, a Phase I does not generally address asbestos-containing materials, biological agents, compliance with activity and use limitations, cultural and historic resources, ecological resources, endangered species, health and safety, indoor air quality, industrial hygiene, lead-based paint, lead in drinking water, mould, radon, regulatory compliance, or wetlands, and in certain circumstances it may be appropriate to conduct a Phase II or use other due diligence methods[8].
We flag clearly that this list comes from commentary on the United States framework rather than on CSA Z768, and Canadian scope should be confirmed with the consultant against the Canadian standard. We include it because the general principle transfers and is important: a Phase I is scoped to contamination risk from historical use, not to building condition, occupational health, or regulatory compliance generally.
Two categories on that list are worth naming for Canadian purchasers of older commercial buildings specifically. Asbestos-containing materials and lead-based paint are building material issues rather than land contamination issues, and a purchaser of a mid-century industrial or commercial building who assumes a clean Phase I covered them may be wrong.
The practical instruction is to ask the consultant directly what the engagement scope excludes, in writing, and to decide consciously whether separate designated substance or building material surveys are warranted.
The Timeline Trap
The operational failure that costs purchasers deals and money, and it is entirely avoidable.
A Phase I takes two to four weeks, and if that is not built into the due diligence timeline from day one, the condition removal deadline will be blown[5].
Work through the sequence, which is our own analysis. An offer is accepted with a conditional period, frequently thirty days in Canadian commercial practice. Environmental assessment is one of several conditions alongside financing, title and inspection. The consultant is engaged after the agreement is signed, which is already a week in. The Phase I takes two to four weeks, so on the longer end the report arrives at or after the deadline.
If the report discloses a REC, the lender wants a Phase II[5]. That is a further engagement, involving sampling and laboratory analysis, and it cannot begin until the Phase I is delivered. A conditional period contemplating one assessment cannot accommodate two performed in sequence.
The purchaser then faces a choice between waiving the condition without the information, seeking an extension from a vendor who may have alternatives, or walking away having spent the fees. None is good, and all three follow from a scheduling decision made at the outset.
Two corrections. Engage the consultant at the offer stage rather than after acceptance, so the clock starts immediately. And negotiate a conditional period that accommodates a Phase II if one becomes necessary, rather than one sized for the best case.
If You Lease Rather Than Own
The section for the larger population, given Hamilton Beach.
Since current owners and tenants were held liable for contamination caused by a former tenant decades earlier[3], a business taking commercial or industrial premises has exposure it almost certainly has not assessed. We offer the following as our own analysis rather than as sourced guidance.
Establish the site's history before signing. A tenant cannot commission the same investigation as a purchaser, but it can ask what the premises were previously used for, whether any assessment exists, and whether any regulatory order affects the property, and can make the answers a condition.
Document the condition at the commencement of the lease. A baseline record, ideally supported by an environmental assessment where the history warrants it, is the evidence that distinguishes pre-existing contamination from anything arising during your occupation. Without a baseline, the allocation between predecessor and current tenant is a matter of inference.
Read the environmental provisions of the lease specifically. Indemnities, covenants regarding compliance and restoration obligations at the end of the term all allocate risk between landlord and tenant, and a restoration covenant requiring the premises to be returned in a specified condition can be onerous where contamination predates your entry.
And recognise the limit of contractual allocation. An indemnity from a landlord governs the relationship between the parties to it. It does not, of itself, prevent a regulator directing an order at a tenant within the statutory scope, and its value depends entirely on the covenantor's solvency when called upon.
A Worked Case: The Condition Period That Was Too Short
A Canadian business purchasing a light industrial building for its operations. The reconstruction illustrates the mechanism rather than reporting a specific engagement.
The agreement provides a thirty-day conditional period covering financing, title and environmental. The lender requires an environmental assessment before approving the mortgage[7]. The consultant is engaged eight days after acceptance, once the deposit clears and the file is opened.
The Phase I proceeds by records review, site visit and interviews. The consultant cannot reach a former owner from the 1980s, when the site was occupied by a business using solvents, and records a data gap. The report is delivered on day twenty-seven and identifies a recognised environmental condition arising from that historical use.
The lender now requires a Phase II before committing[5]. Sampling and analysis cannot be completed within three days. The purchaser must waive the condition without knowing what is in the ground, seek an extension, or walk away.
If it waives and proceeds, it becomes an owner who has a report disclosing a recognised environmental condition. Against the standard that liability arises where an owner knows or ought to have known of contamination and fails to address it[2], and against a defence available to a purchaser who investigated and did not know[5], that is a materially worse position than either investigating fully or never having looked, and its directors carry personal exposure alongside the company[2].
The entire outcome traces to a scheduling decision made before anyone thought about the environment at all.
What To Do
Treat environmental risk as attaching to the address, not the activity. Current and former owners can be liable whether or not they caused the contamination.
Tenants: assess before signing. Hamilton Beach establishes that occupation without ownership is not a shield, and most Canadian tenants do no environmental diligence at all.
Engage the consultant at the offer stage and size the conditional period for a Phase II. Two to four weeks for a Phase I, plus a second assessment if a REC appears, does not fit a standard thirty-day condition.
Insist on CSA Z768 conformity in writing. The innocent purchaser defence is tied to the standard, so a cheaper non-conforming report may provide no protection.
Read the data gaps before the conclusions. A report with unresolved gaps is incomplete rather than clean, and gaps are common where former owners cannot be reached.
Ask what the scope excludes. Asbestos, lead-based paint and building material issues are generally outside a Phase I, and older commercial buildings warrant separate consideration.
Establish early whether contamination has migrated off-site. Migration adds civil exposure to neighbours that is not capped by remediation cost and is not precluded by a regulatory order.
Directors: build a documented record of steps taken. The duty is to take all reasonable steps, personal fines reach $100,000 with potential imprisonment, and cleanup liability can attach regardless of fault.
Do not rely on the corporation. Courts have pierced the veil here, and exposure has been described as available even where the company is solvent.
Lenders and investors in distressed situations: price the control question. Management, care or control can attract remediation liability, and deeper operational involvement cuts against you on this axis while helping on credit.
The Limits Of This Analysis
Several caveats matter, and this is an area where general statements are especially unsafe. Environmental regulation in Canada is primarily provincial and the statutes differ substantially; the statutory provisions described here are drawn from commentary on Ontario's Environmental Protection Act and Ontario Regulation 153/04, and readers in other provinces must work from their own legislation. The two decisions discussed, Hamilton Beach Brands Canada Inc v Ontario (2018 ONSC 5010, Div Ct) and Midwest Properties Ltd v Thordarson (2015 ONCA 819), are reported from secondary legal commentary rather than from the judgments, and should be read directly before being relied on; our characterisation of their scope reflects how those sources describe them. The scope exclusions listed for a Phase I derive from commentary on the United States standard and are included illustratively, with Canadian scope under CSA Z768 to be confirmed with the consultant. Cost and timeline figures come from a single mortgage brokerage source and will vary by property, region and consultant. The innocent purchaser defence is described by its source as available with conditions and under most provincial legislation, neither of which we have verified jurisdiction by jurisdiction. The tenant guidance and the lender control observations are our own analysis rather than sourced findings. This article does not address federal regimes including the Canadian Environmental Protection Act in any detail, Records of Site Condition procedure, risk assessment as an alternative to remediation, environmental insurance, brownfield redevelopment incentives, Quebec's regime, contaminated sites accounting and provisioning under ASPE or IFRS, or the specific defences available to receivers and trustees. Nothing here is legal advice; obtain environmental law advice in the applicable province before acquiring, leasing or financing property with any industrial history.
Frequently Asked Questions
I did not cause the contamination. Am I still liable?
Does this reach tenants?
Does incorporation protect me personally?
What do directors specifically face?
What does a Phase I cost and how long does it take?
Does a Phase I protect me?
References
- Nichols Environmental + Engineering. (2025, August 21). Environmental Site Assessments (ESA) in Canada: Phases and Procedures, on the polluter pays principle in Canadian practice, the purpose of ESAs, and financing consequences where no assessment exists. Note: published by an environmental consulting firm. nichols.ca/blog/environmental-site-assessments-in-canada
- McMillan LLP. (2023, April 19). The Polluter Does Not Always Pay: Environmental Liability of Property Owners, on liability of purchasers who did not cause contamination, the knew-or-ought-to-have-known standard and migration, the duty to act proactively, and officer and director risk even where the responsible company is liable and solvent. mcmillan.ca/insights/publications/the-polluter-does-not-always-pay-environmental-liability-of-property-owners
- Devry Smith Frank LLP. (2024, March 20). Involved in a Commercial Real Estate Transaction? Make Sure You Complete Your Due Diligence with Respect to Environmental Issues, on section liability of current and former owners under the Environmental Protection Act, Hamilton Beach Brands Canada Inc v Ontario (2018 ONSC 5010, Div Ct), Midwest Properties Ltd v Thordarson (2015 ONCA 819), and civil actions by neighbours notwithstanding a remediation order. Note: case descriptions are from this secondary source rather than the judgments. devrylaw.ca/involved-in-a-commercial-real-estate-transaction
- Miller Thomson. (2026, January 27). Environmental Liability: What Every Business Owner and Director Needs to Know, on the duty to take all reasonable steps, personal fines up to $100,000 and potential imprisonment, cleanup liability regardless of fault, orders issued regardless of corporate insolvency or prosecution, and management, care or control extending to investors and secured creditors. millerthomson.com/en/insights/environmental/environmental-liability-what-every-business-owner-and-director-needs-to-know
- LendCity Mortgages. (2026, March 5, updated May 22, 2026). Phase 1 ESA Canada 2026: Cost, Process and Lender Impact, on CSA Z768, the $3,000 to $8,000 cost and two to four week timeline, the innocent purchaser defence with conditions, the interview limitation and data gaps, the REC and CREC hierarchy, and lender behaviour following a REC. Note: published by a mortgage brokerage. lendcity.ca/blog/phase-1-environmental-site-assessment-commercial-buyers-guide
- Willis Business Law. (2025, July 18). A Guide to Environmental Due Diligence in Ontario Commercial Real Estate, on Phase I components, Phase II scope and Phase III remediation, the Environmental Protection Act framework, Ontario Regulation 153/04 on Records of Site Condition, and the qualification of consultants. willisbusinesslaw.com/blog/commercial-real-estate/a-guide-to-environmental-due-diligence-in-ontario-commercial-real-estate
- BDC. (2024, August 6). Environmental Site Assessments: What You Need to Know, on the purpose of due diligence in limiting a purchaser's liability and on most lenders requiring an environmental assessment of commercial property. bdc.ca/en/articles-tools/money-finance/buy-lease-commercial-real-estate/what-you-need-know-about-environmental-site-assessments
- Moore & Van Allen. Environmental Due Diligence in Commercial Real Estate Transactions, on conditions a Phase I does not generally address and the circumstances warranting a Phase II or other methods. Note: commentary on the United States framework, cited illustratively; Canadian scope under CSA Z768 should be confirmed with the consultant. mvalaw.com/insights-10011
This article discusses environmental liability and due diligence and is provided for general informational purposes. It is not legal advice. Environmental regulation is primarily provincial and statutes differ; provisions described are drawn from commentary on Ontario legislation. Case descriptions derive from secondary sources and the judgments should be read directly. Obtain environmental law advice in the applicable province before acquiring, leasing or financing property with any industrial history.