The Contamination You Didn’t Cause: How an Environmental Indemnity Works in a Commercial APS
You buy a site that once held a gas station, a dry cleaner, or an auto shop. Solvent that leached into the soil decades ago surfaces after closing. Whose problem is it now? The answer runs on two separate tracks — and a beautifully drafted indemnity protects you on only one of them.
I bought commercial land that was contaminated before I owned it. Do I pay to clean it up, or does the seller?
The honest answer has two layers, because you owe two different parties at once.
To the regulator: it may well be you. Under Ontario’s Environmental Protection Act (R.S.O. 1990, c. E.19), section 18, the Ministry (MECP) can order a current OR former owner or occupier to investigate and clean up — and this is a no-fault provision. It requires no connection between you and the polluting activity; simply owning or occupying the land, now or in the past, is enough. So even if the contamination came from an operator two owners ago, today’s owner can be named.
To the seller: you chase them by contract. This is where the environmental indemnity in the Commercial Agreement of Purchase and Sale (APS) finally does its job — it lets you recover from the seller after you have been named and have paid. It allocates money between buyer and seller. It cannot change who the regulator comes after first.
Sources: Ontario Environmental Protection Act (R.S.O. 1990, c. E.19), ss. 17–18; Government of Ontario, Records of Site Condition / Brownfields guidance (ontario.ca, accessed July 2026)
I’m Arthur Zhao. In commercial real estate, environmental exposure is the risk buyers most often underweight and, once it lands, the one that burns the most cash.
Let me frame what this piece is not about. It is not about how to run an environmental assessment — that is the Phase I / Phase II world, the mechanics of how you investigate. This piece is about a different question entirely: who bears the liability for past and unknown contamination under the contract. People routinely fuse these two into one. They are separate systems.
And the costliest myth of all: that dropping an environmental indemnity into the APS hands the contamination problem to the seller. It does not. Ontario runs environmental liability on two tracks — a public one the regulator holds against you that no contract can touch, and a private one between you and your seller. This piece walks both tracks, marks the real boundary of what an indemnity does, and names the three clauses that decide whether it is worth anything at all.
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Start here: you owe two different parties at the same time
Track one is your public-law liability to the regulator. It comes from statute, not from anything you negotiated. If the Ministry decides land must be cleaned up, it has statutory power to name the right person — and the pool of people it may name is wider than most buyers expect (next section). Nothing you and the seller write in the APS changes a single word on this track.
Track two is your private allocation with the seller. This is the layer where the environmental indemnity and the reps-and-warranties live. It decides, as between the two of you, who ultimately absorbs the cost and who recovers from whom.
Why insist on separating them first? Because nearly every buyer who pays out gets caught in the gap between these two tracks — they assumed the indemnity in the contract would stop a Ministry order. It won’t. The contract governs track two; the regulator travels on track one.
The public track: Ontario can name you whether or not you caused it
Section 17 — fault-based. Aimed at a person who caused or permitted the discharge, requiring them to investigate, delineate, and remediate — including contamination that has migrated off-site. This is the ‘you made the mess, you clean it’ path.
Section 18 — no-fault. This is the one buyers should fear. It is an absolute-liability provision: the Ministry can order a current or former owner or occupier, and it does not require any nexus between that person and the polluting activity. Owning or occupying the land is enough, full stop.
Put the two together and the takeaway is unfriendly to buyers: even if the contamination was caused by a prior operator decades ago, you — today’s owner — can be independently ordered to investigate and remediate. This is not a fringe scenario; Ontario courts have repeatedly upheld orders of this kind against so-called innocent owners.
Hold onto the core of this layer: public liability follows the land, and it follows the status of ‘current owner.’ It does not ask whether that feels fair.
🚨No-fault liability is the risk buyers most underweight. Under EPA s.18, the Ministry can order a current or former owner or occupier to clean up, with no requirement that you had any connection to the polluting activity. You can be independently ordered to investigate and remediate on the single fact that you now own land contaminated decades before you bought it. No contract clause can override the Ministry’s statutory power.
Your standard form is silent: the OREA Commercial APS doesn’t cover contamination
The opposite. Ontario’s workhorse commercial contract, OREA Form 500 (Agreement of Purchase and Sale — Commercial), is essentially silent on environmental matters. Beyond a line confirming the building contains no urea-formaldehyde foam insulation (UFFI), it does not address contaminated land, and it expressly states that any information a brokerage provides is not environmental advice and that the parties should obtain independent professional advice before signing.
What follows from that? The standard form will not allocate environmental liability for you — you have to negotiate it in, clause by clause, through a Schedule. If the Schedule is silent, the default position you inherit is usually the one least friendly to a buyer: see ‘as-is / where-is’ in the next section.
So environmental protection on commercial land is never something you ‘have’ because you used a proper contract. It is something you have because you negotiated it in. The blanks are not neutral — the blanks have defaults, and the defaults rarely favour the buyer.
What an environmental indemnity actually does
Here is its typical mechanics. After closing, the Ministry issues you — the current owner — a cleanup order for contamination that already existed before closing. You pay first, because you must, on the public track. Then you turn to the environmental indemnity in the APS and require the seller to reimburse you.
See its two boundaries clearly:
1. It binds only the seller, not the regulator. The indemnity is a private bargain between buyer and seller. It cannot strip the Ministry of its statutory power to name you under s.18. You cannot wave the contract at the Ministry and say ‘go after the seller’ — the Ministry is not a party to your deal.
2. It is ‘pay first, recover later,’ not ‘pay nothing.’ In practice you often front the money and manage the order, then claw it back. The timing gap, the cash-flow strain, and whether the seller still exists and can still pay when that day comes — all of it is risk (which is exactly what the final section’s three details address).
Get the position right and you’ll understand: the indemnity matters, but it is your second line of defence. The first line is always investigating the contamination before closing and pricing the deal correctly.
⚠️An indemnity is only worth the seller’s future solvency. It is a private bargain between buyer and seller: it does not stop the Ministry from naming you, and its value depends entirely on whether the seller still exists and can still pay years later. The most carefully drafted indemnity can be worth close to nothing if the seller is a shell entity dissolved right after closing.
Representations and warranties: the seller’s factual promises
The indemnity does the ‘paying,’ but the trigger for paying usually hangs on the representations and warranties.
Reps and warranties are the seller’s promises about facts. For example, the seller represents and warrants that the prior use of the property caused no contaminants above regulatory standards; that to its knowledge there are no undisclosed environmental orders, notices, or investigations; that no underground storage tanks remain on site. These are factual assurances.
The seam with the indemnity works like this: if a representation later proves false — say there really is an abandoned underground tank — that is a breach of warranty, on which the buyer can claim damages, and the environmental indemnity fixes how, how much, and up to what limit that breach gets paid out.
Flip it around. If the deal runs ‘as-is / where-is,’ the seller gives almost no environmental reps or warranties and the risk tilts hard toward the buyer. Accepting as-is is a declaration: I backstop the environmental condition with my own due diligence and expect nothing from the seller’s promises. As-is land is not un-buyable — but the price has to discount that risk, and the due diligence has to be thorough.
💡 Compress the whole piece into one line: an environmental indemnity is not a firewall — it is a receipt for recovery. Whether the Ministry can name you under EPA s.18 has nothing to do with what your contract says. The contract only decides whether, and how far, you can claw the money back from the seller after you’ve been named and have paid. See both tracks clearly before you draft the clause.
As-is/where-is vs. a negotiated environmental package
■ Path A: as-is / where-is
· Seller’s environmental promises: few, or none
· Where risk lands: heavily on the buyer
· Your protection comes from: your own due diligence (Phase I / II) + a price discount
· Who you chase if it goes wrong: essentially yourself
· Fits when: price already reflects the risk, the buyer can independently assess the environmental condition, or the seller is a special party (receiver, estate) unable to give warranties
■ Path B: reps + warranties + environmental indemnity
· Seller’s environmental promises: explicit factual reps and warranties
· Where risk lands: split between the parties per the clauses
· Your protection comes from: a damages claim for breach + the indemnity’s payout terms
· Who you chase if it goes wrong: the seller (provided: within the survival period + the seller is solvent)
· Fits when: the seller is a real, asset-backed operating entity willing to stand behind the condition during its ownership
Notice one thing: whichever path you take, the public track is unchanged — the Ministry can still name the current owner first. The difference between the paths lives only on track two: who you recover from afterward, and how.
Don’t confuse ‘how you investigate’ with ‘who pays’: Phase I, Phase II, and the RSC
Phase I Environmental Site Assessment (ESA): under Ontario’s O. Reg. 153/04 and government guidance, a Phase I is a records review, site visit, and interviews. It does not include sampling and analysis. Its job is to judge the likelihood that contaminants have affected the property.
Phase II ESA: triggered when the Phase I flags a risk, it does involve sampling and analysis (soil at minimum; groundwater and sediment as warranted), to determine the location and concentration of contaminants. Both must be done by a statutorily defined Qualified Person (typically a licensed professional engineer or registered geoscientist).
Record of Site Condition (RSC): once the assessment meets the standard, an RSC can be filed on Ontario’s Environmental Site Registry. Per the Government of Ontario, once an RSC is filed, Part XV.1 of the EPA provides that certain types of orders cannot be made against the owner (with exceptions — for example, false or misleading information, or an emergency).
See the three of them for what they are: tools for how you investigate and how you insure yourself on the public track — inputs that price, or even partly substitute for, your indemnity — but not themselves the contractual allocation clause. The ideal acquisition sequences them: investigate with Phase I / II → decide on an RSC and price accordingly → then negotiate reps, warranties, and indemnity against what you actually found. They work together; they don’t replace one another.
ℹ️An RSC’s protection is conditional, not a blanket shield. Per the Government of Ontario, once a Record of Site Condition is filed, Part XV.1 of the EPA provides that certain types of orders cannot be made against the owner — but with exceptions (for example, an RSC based on false or misleading information, or an emergency). An RSC is powerful public-law protection, but it protects only up to the site condition it certifies — not issues outside or arising after that certification.
The three clauses that decide whether the indemnity is worth anything
1. Survival period. Reps, warranties, and the indemnity usually survive for a defined period after closing; once it lapses, the seller’s liability is extinguished. The problem: soil and groundwater contamination can surface years — even a decade — later. A short survival period hands the seller a ‘outlast the clock’ escape. Environmental survival periods are worth negotiating longer than ordinary commercial terms.
2. Cap and basket. Sellers typically seek an aggregate payout cap and a threshold (a basket / deductible below which nothing is owed). If the cap sits far below plausible cleanup costs, the clause is a teaspoon against a flood in the worst case. Ask directly: if remediation actually happens, is this cap enough.
3. Seller credit risk — will they still be there, and able to pay. The most overlooked and most lethal point. An indemnity is never worth more than the seller’s future solvency. If the seller is a single-purpose entity that dissolves right after closing, then years later you’re waving a perfect indemnity at an empty shell. The fix: require a parent-company or personal guarantee, an escrow / holdback of part of the proceeds, or environmental liability insurance to ring-fence the ‘seller vanishes / goes insolvent’ risk on its own.
These three — not the boilerplate — are where the real negotiation happens. Anyone can copy the language of an indemnity; nailing these three is how you actually manage the risk.
Frequently Asked Questions
I bought as-is commercial land and later found old contamination. Can I still go after the seller?
Usually no. The whole point of ‘as-is / where-is’ is that the seller gives almost no environmental reps or warranties, and the risk tilts hard toward the buyer. Accepting as-is is a declaration that you backstop the environmental condition with your own due diligence and expect nothing from the seller. So when a problem surfaces, you’re generally on your own. As-is land is not un-buyable, but two conditions are non-negotiable: the price must already discount the environmental risk, and your pre-closing Phase I / II due diligence must be thorough.
We already did Phase I and Phase II ESAs. Do we still need an environmental indemnity?
Yes — they play different roles and complement each other. Phase I / II are about how you investigate — judging the likelihood of contamination (Phase I: records review and site visit, no sampling) and pinning down its location and concentration (Phase II: sampling and analysis). The environmental indemnity is about who pays — allocating the cost of known and unknown contamination between buyer and seller. What the reports find becomes the basis for negotiating the indemnity; what they miss is exactly the unknown risk the indemnity is meant to catch. Best practice is to investigate first, then negotiate the clauses against what you found — not to pick one over the other.
Can an environmental indemnity stop a Ministry cleanup order?
No. Under EPA s.18, the Ministry (MECP) can issue a no-fault cleanup order to a current or former owner or occupier — a statutory power that a private contract between buyer and seller cannot strip away. The indemnity allocates money between the two parties: it lets you recover from the seller after you’ve been named and paid first. It does not decide who the Ministry pursues first. That is why it is a receipt for recovery, not a firewall.
What does a Record of Site Condition (RSC) actually protect?
Per the Government of Ontario, once an environmental assessment meeting the standard is filed as a Record of Site Condition on the Environmental Site Registry, Part XV.1 of the EPA provides that certain types of cleanup orders cannot be made against the owner (with exceptions — for example, reliance on false or misleading information, or an emergency). It must be completed by a statutorily defined Qualified Person. The key point: an RSC is public-law protection, limited to the site condition it certifies. It does not replace the contractual allocation between you and the seller, and it does not cover new issues outside its certified scope.
How long does an environmental indemnity usually last? Is there a fixed term?
There is no statutory fixed term — which is precisely why it must be negotiated. Reps, warranties, and the indemnity typically carry a survival period after closing, and once it lapses the seller’s liability ends. Because soil and groundwater contamination can surface many years later, environmental survival periods are worth pushing longer than ordinary commercial terms. Beyond the term, nail down two more points together: whether the cap is large enough to cover plausible cleanup costs, and whether the seller will still be solvent (backstop with a parent / personal guarantee, an escrow or holdback, or environmental liability insurance where needed).
Arthur Zhao
Real Estate Broker · FRI · ABR · SRS · PSA · MCNE · E-PRO · CLHMS & GUILD Elite · REAIS
VP & Branch Manager, Bay Street Group Inc.
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