Domestic Substances List -P Suffix Update

Summary#

Order 2025-66-01-01 Amending the Domestic Substances List updates how a long list of chemicals appears on the Domestic Substances List. The order took effect on the day it was registered — December 6, 2024.

What it does#

• Deletes many specific chemical entries from Part 1 of the Domestic Substances List and re-adds those same entries with a “-P” suffix added to their listing codes (for example, an entry shown as “25053-63-8 T” in the list is changed to “25053-63-8 T‑P”).
• Replaces many references in Part 3 of the List by appending “-P” to those listed codes.
• Is made under the Canadian Environmental Protection Act, 1999.
• Comes into force on the day it is registered (December 6, 2024).
• The order itself does not explain what the “-P” suffix stands for. The text simply changes the listings; it does not add explanatory text about the meaning of the new suffix.

Who's affected#

• Companies that make, import, sell or use the chemicals listed on the Domestic Substances List.
• Compliance officers, consultants and labs that track chemical inventories and regulatory listings.
• Government staff who manage chemical records and follow-up actions under the Canadian Environmental Protection Act, 1999.
• For the general public and most consumers, the change is unlikely to have immediate day-to-day effects; its main effect is on regulatory tracking and reporting.

Why it matters#

• How a chemical is listed can affect how regulators track it and whether it is chosen for further assessment or controls. A change in listing codes can therefore matter for later regulatory steps.
• Businesses that handle the affected chemicals should check their records to see whether listings for substances they deal with were changed, because that can affect reporting or compliance work.
• Because the order does not define “-P” in the text, people and companies needing clarity will likely need to consult Environment Canada (or related guidance) to understand any practical consequences.