Domestic Substances List updated with -P codes

Summary#

This is Order 2026-66-11-01 Amending the Domestic Substances List, made under the Canadian Environmental Protection Act, 1999. It updates many entries on the Domestic Substances List (changing how those substances are recorded) and updates a number of cross‑references in Part 3; the order came into force on the day it was registered (September 8, 2026) and was published in the Canada Gazette on September 23, 2026.

What it does#

• Removes a long set of chemical entries from Part 1 of the Domestic Substances List and immediately re‑adds those same entries with a revised code that appends “-P” (for example, a code listed as “N” or “T” is replaced by “N‑P” or “T‑P”). The order lists many CAS registry numbers, but does not explain the practical meaning of the “-P” change in this text.
• Updates dozens of cross‑references in Part 3 of the Domestic Substances List by adding “-P” to many existing references (for example, entries like “11746-1 T” are replaced by “11746-1 T‑P”).
• The order was signed by Julie Dabrusin and it states that it comes into force on the day it is registered (which was September 8, 2026).
• A Regulatory Impact Analysis Statement for these changes is noted as appearing after SOR/2026-192 (another order amending the list).

Who's affected#

• Companies that make, import, supply or use the chemicals listed on the Domestic Substances List are the most likely to notice this change.
• Chemical suppliers, product manufacturers, environmental consultants and regulators who check the official list for compliance, reporting, or screening work.
• The order itself does not say exactly how obligations or rules for these chemicals change. If you work with any of the listed CAS numbers, you should check the updated list and the related Regulatory Impact Analysis Statement (referenced as following SOR/2026-192) for details.

Why it matters#

• The Domestic Substances List is the official inventory Canada uses to track chemicals in commerce. Changes to how a substance is recorded can affect how businesses and regulators identify and handle it.
• Even if the change looks like a technical update (adding “-P”), it may matter in practice for reporting obligations, assessments, or whether a substance is subject to specific controls. The order text itself does not explain the policy reason or the practical effect of “-P”.
• Businesses and consultants who rely on the list should review the updated entries and the accompanying Regulatory Impact Analysis Statement to understand any compliance or operational impacts.