Domestic Substances List

The Domestic Substances List (DSL) is an inventory of substances manufactured in, or imported into Canada on a commercial scale. It was originally published in the Canada Gazette Part II on May 4, 1994 and included approximately 23 000 substances deemed to have been in Canadian commerce between January 1984 and December 1986. The DSL is amended, on average, 12 times per year to add, update or delete substances. It now contains more than 28 000 substances and can be accessed through Substances Search.

Substances on the DSL are grouped into 8 parts and may have one or more of 5 available flags applied to them. For example, the N flag indicates that the substance was notified and assessed as a new substance, and subsequently added to the DSL.

New substances and the DSL

Substances not on the DSL are considered new to Canada. Prior to being imported or manufactured over certain threshold, they must be notified and assessed to determine if they are toxic or could become toxic.

Under the Canadian Environmental Protection Act, 1999 (CEPA), any person (individual or corporation) manufacturing a new substance in or importing a new substance into Canada must provide a new substances notification containing the information prescribed by the New Substances Notification Regulations (Chemicals and Polymers) or the New Substances Notification Regulations (Organisms). Substances on the DSL do not require notification unless they are subject to significant new activity (SNAc) requirements.

For more information on the assessment and management of new substances in Canada, please visit New substances: evaluating new substances.

Masked names

Under CEPA, any information provided to the Minister of the Environment and Climate Change may be claimed confidential. When substance identity is considered confidential, CEPA allows for the publication of masked substance names on the DSL. Therefore, confidential substances on the DSL are identified by a masked name, regulated under the Masked Name Regulations and a unique confidential substance identity number assigned by Environment and Climate Change Canada. This number is also referred to as a confidential accession number (CAN).

Parts of the DSL

The DSL consists of 8 parts, in which substances are divided based on:

• substance type (chemicals and polymers or inanimate products of biotechnology and living organisms)
• confidentiality
• whether the SNAc provisions of CEPA have been applied

* For example, a substance can be added to part 5 or 6 under its Enzyme Commission number, assigned by the IUBMB.

DSL flags

The DSL contains 5 different flags for substances; depending on different situations, more than one flag can apply.

The following 3 regulatory flags indicate that, although the substance is listed on the DSL, additional notification requirements may apply prior to manufacture or import.

• S flag: indicates that the substance is subject to SNAc requirements and is applied when the substance was subject to SNAc requirements prior to its addition to the DSL

• S′ (S prime) flag: indicates that the substance is subject to SNAc requirements and is applied when the substance was not subject to SNAc requirements prior to its addition to the DSL

• P flag: indicates that the substance was added to the DSL on the basis that it met the Reduced Regulatory Requirement (RRR) polymer criteria; any form of the substance that does not meet the RRR polymer criteria is subject to notification prior to import or manufacture

The following 2 administrative flags are used to identify substances added to the DSL under specific scenarios.

• T flag: indicates that the substance was manufactured or imported during the transitional period (for example, between January 1, 1987, and July 1, 1994); these substances have been assessed by the New Substances program

• N flag: indicates that the substance was notified and assessed as a new substance after July 1, 1994, and subsequently added to the DSL based on its manufacture in or import into Canada

Related links

• Substances search
• The Chemicals Management Plan for priority substances on the DSL
• Domestic substances list: categorization of existing substances

Contact us

Program Development and Engagement Division
Environment and Climate Change Canada
351 Saint-Joseph Blvd
Gatineau QC  K1A 0H3

Telephone: 819-938-3232 or 1-800-567-1999 (Canada only)
Email: substances@ec.gc.ca