Navigating New Changes to Canada’s Domestic Substances List (DSL)
- Georgie Whitehouse
- May 7
- 3 min read
For businesses operating in the Canadian marketplace, navigating the complexities of the Canadian Environmental Protection Act, 1999 (CEPA) is a critical component of regulatory compliance. Two of the most important tools in this landscape are the Domestic Substances List (DSL) and the Non-domestic Substances List (NDSL).
Recent updates published in the Canada Gazette and by Environment and Climate Change Canada (ECCC) highlight the evolving nature of these lists and the importance of staying current. Here is what you need to know about the latest changes and how they impact your compliance strategy.
The DSL vs. The NDSL: What’s the Difference?
Before diving into the updates, it is essential to understand the roles these two lists play:
Domestic Substances List (DSL): This is the definitive inventory of substances commercially available in Canada. If a substance is on the DSL, it is not considered "new" to Canada, though it may still be subject to specific reporting or management requirements (like Significant New Activity or SNAc provisions).
Non-domestic Substances List (NDSL): This list contains substances that are not on the DSL but are in commercial use internationally—specifically those that have been on the U.S. Environmental Protection Agency's (EPA) TSCA Inventory for at least one year.
Why does it matter? While substances on the NDSL are still considered "new" to Canada, they benefit from reduced information requirements during the New Substances Notification (NSN) process compared to substances not listed on either inventory.
Key Update: Order 2026-112-03-01 (SOR/2026-52)
On April 8, 2026, the Government of Canada published Order 2026-112-03-01, formally amending the Domestic Substances List. This update is a milestone for the specific substances involved:
Addition of Living Organisms: The order added four living organisms to the DSL, including a recombinant viral vector and unmodified human hematopoietic stem cells.
Chemical and Polymer Additions: Four additional chemicals and polymers were also added to the list.
Regulatory Relief: Once a substance is added to the DSL, it is no longer subject to the New Substances Notification Regulations (Chemicals and Polymers) or the New Substances Notification Regulations (Organisms). This facilitates easier market access for businesses that were previously required to provide notification before manufacture or import.
Navigating the NDSL Eligibility and Updates
The NDSL is not a static document; it is typically amended annually. Recent guidance from ECCC clarifies the eligibility criteria for adding substances to this list:
TSCA Alignment: To be eligible for the NDSL, a substance must have been on the public TSCA Inventory for at least one year.
Exclusions: Not all TSCA substances make the cut. Canada excludes substances subject to risk management (like certain PFAS), as well as those governed by international treaties like the Stockholm or Rotterdam Conventions.
Confidentiality: Substances on the confidential portion of the TSCA inventory are not automatically added. Companies must nominate these substances and provide evidence of their status on the U.S. inventory to have them listed on the NDSL (often under a "masked name").
What This Means for Your Business
Staying compliant means more than just checking a box; it requires proactive monitoring of these lists.
Search Before You Import: Use the Government of Canada’s Substance Search tool to verify the status of any chemical, polymer, or organism.
Evaluate Notification Requirements: If your substance is on the NDSL but not the DSL, you still need to notify the government, but your data burden will be significantly lower.
Monitor the Gazette: Orders like SOR/2026-52 are published regularly. A substance moving from the NDSL to the DSL represents a significant reduction in your ongoing regulatory burden.
How GoCompliance Can Help
At GoCompliance, we specialize in helping businesses navigate the shifting sands of Canadian environmental regulations. Whether you need help with a New Substances Notification, searching the DSL/NDSL, or understanding how the latest updates affect your supply chain, our experts are here to ensure your operations remain uninterrupted and compliant.
Contact us today to learn more about our chemical management and regulatory tracking services.
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