Underground Oil Storage Tank

An underground oil storage tank (often called a buried oil tank or UST) is a tank installed below ground, typically used to store heating oil for residential or commercial properties. In BC real estate transactions, these tanks are important because if they leak, they can cause soil and groundwater contamination, creating significant liability and remediation costs. The presence, condition, and removal history of such tanks must often be disclosed during property sales. Verify disclosure obligations and environmental liability with a BC lawyer or notary before completing a transaction.

Under the common law duty of disclosure and BC Real Estate Services Act (RESA) framework, sellers and their licensees must disclose known material latent defects, which typically includes the presence of an underground oil tank because of contamination and liability risk. The BC Real Estate Association standard Contract of Purchase and Sale and Property Disclosure Statement forms prompt sellers to disclose underground tanks. Verify your specific disclosure obligations with a BC lawyer or notary, as failure to disclose can result in legal claims for misrepresentation or breach of contract.

BC's Environmental Management Act, SBC 2003, c. 53, governs contaminated site remediation and liability; anyone who stores or has stored fuel in an underground tank may be liable for contamination cleanup under this Act. Local governments may also have bylaws regulating tank installation, decommissioning, and removal. Federal regulations under the Canadian Environmental Protection Act, 1999 may apply in certain cases. Verify current federal and provincial environmental requirements, and consult a qualified environmental consultant or BC lawyer for site-specific obligations.

Under BC's Environmental Management Act, SBC 2003, c. 53, multiple parties can be held liable for contamination remediation, including current and past owners, occupiers, and persons who produced or contributed to the contamination. Liability is strict, joint, and several, meaning any responsible party can be required to bear the full cleanup cost and then seek contribution from others. Because liability can extend back in time and to multiple parties, verify your potential exposure and remediation obligations with a BC environmental lawyer before purchasing or selling property with a known or suspected underground tank.

If an undisclosed underground oil tank constitutes a material latent defect or misrepresentation, a buyer may have grounds to refuse completion, claim damages, or seek rescission of the contract, depending on the terms of the Contract of Purchase and Sale and the circumstances of non-disclosure. The BC Court of Appeal and Supreme Court have recognized that undisclosed environmental hazards, including underground tanks, can give rise to remedies for innocent misrepresentation or breach of contract. Verify your remedies and next steps immediately with a BC real estate lawyer if you discover an undisclosed tank before or after closing.

Removal and remediation costs vary widely depending on tank size, depth, accessibility, extent of soil contamination, and proximity to groundwater, but industry estimates in BC range from approximately $3,000 to $5,000 (as of 2026-07-27 — verify current) for a straightforward removal with no contamination, to $20,000 or significantly more (as of 2026-07-27 — verify current) if extensive soil excavation and disposal are required. These are rough estimates only; obtain written quotes from licensed environmental contractors and verify current regulatory requirements and disposal fees with a qualified environmental consultant before proceeding.

Many BC real estate practitioners and environmental consultants recommend a tank location scan (using ground-penetrating radar or metal detection) and, if a tank is found, a Phase I or Phase II Environmental Site Assessment, especially for homes built before the 1960s when underground oil tanks were common. While not legally mandatory for all purchases, such assessments can identify contamination risk and potential Environmental Management Act liability before title transfers. Verify whether a tank scan or assessment is prudent for your specific transaction with a BC lawyer, notary, or environmental consultant.

Some BC residential title insurance policies offer limited coverage for costs to remove an undisclosed underground oil tank discovered after closing, subject to policy limits, deductibles, and exclusions (often capped at $10,000 to $25,000 as of 2026-07-27 — verify current policy terms). Title insurance does not typically cover environmental cleanup costs under the Environmental Management Act or third-party contamination claims. Review your specific title insurance policy wording and coverage exclusions carefully, and verify what is and is not covered with your title insurer or a BC real estate lawyer before relying on such coverage.

A seller should provide a tank removal certificate or decommissioning report issued by a licensed environmental contractor, along with any soil sampling and remediation reports, and confirmation that the site meets BC Ministry of Environment standards and any applicable local government requirements. If contamination was remediated, a Certificate of Compliance or Approval in Principle under the Environmental Management Act may have been issued. Verify that documentation is complete and satisfies current regulatory requirements by consulting a BC environmental consultant or lawyer before accepting removal records as adequate.

Many BC municipalities require a permit before removing an underground oil tank, and some require inspection or approval of soil sampling and remediation work; requirements vary by local government bylaw. The tank removal contractor typically applies for and obtains such permits on behalf of the property owner. Verify current municipal permit, inspection, and reporting requirements with your local government and a licensed environmental contractor before commencing tank removal or decommissioning work.