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Results for substance identifier "123-31-9"

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List or group: Environmental Emergency Regulations
Substance identifier: 123-31-9
Substance identifier (2):
Substance name: 1,4-Benzenediol
Additional information: This substance, listed in Part 1, Item #102 with a Hazard Category (A = aquatically toxic) under schedule 1 with CAS Registry number 123-31-9 is subjected to the reporting of a release in section 18 of the Environmental Emergency Regulations, 2019 if it meets the minimum concentration of 10% (mass/mass) and is not part of exclusions in 2(2).

In addition, facilities will have to report quantities on site or/and create and bring into effect an environmental emergency plan for their site, if they meet certain conditions in the Environmental Emergency Regulations, 2019 and have a minimum of 0.22 tonnes on site.

For further information, please consult the Environmental emergencies website.
Recent publication(s): Environmental Emergency Regulations, 2019: SOR/2019-51 were published on March 6, 2019 and came into force on August 24, 2019.
Date published: 2019-03-06
List or group: National Pollutant Release Inventory (NPRI)
Substance identifier: 123-31-9
Substance identifier (2):
Substance name: Hydroquinone (and its salts)
Additional information: NPRI Part (Threshold Category): 1A, Reportable to NPRI if manufactured, processed, or otherwise used at quantities greater than: 10 tonnes. Total of the acid or base and its salts, expressed as the molecular weight of the acid or base. The CAS RN corresponds to the weak acid or base.
Recent publication(s): National Pollutant Release Inventory (NPRI) Substance List
Date published: 2016-07-11
List or group: Domestic Substances List (DSL)
Substance identifier: 123-31-9
Substance identifier (2):
Substance name: 1,4-Benzenediol
Additional information: This substance is on the DSL.

Substances not on this list require notification under the New Substances Notification Regulations (Chemicals and Polymers) or New Substances Notification Regulations (Organisms) so that health and ecological risks can be assessed before the substance is manufactured or imported into Canada above threshold quantities.

A Notice or Order has been published indicating that the Significant New Activity (SNAc) provisions of CEPA apply to this substance.

This action can be taken when it is suspected that new activities involving a substance could result in the substance becoming CEPA Toxic.

The SNAc provisions trigger an obligation for a person to provide specific information when proposing to use the substance in a significant new activity. The Government will assess the information to determine whether the substance, if used in a significant new activity, could pose a risk to the environment or to human health and, if so, whether risk management is required.


This substance was added to the DSL as an “Existing Substance”, i.e. already in commerce in Canada in 1984-1986 and not subject to the New Substance Notification Regulations.
Recent publication(s): Canada Gazette Part II, Vol. 145, No. 26, December 21 2011, SOR/2011-293
Date published: 2011-12-21
List or group: Significant New Activity (SNAc) orders and notices
Substance identifier: 123-31-9
Substance identifier (2):
Substance name: 1,4-Benzenediol
Additional information: A Notice or Order has been published indicating that the Significant New Activity (SNAc) provisions of CEPA apply to this substance.

This action can be taken when it is suspected that new activities involving a substance could result in the substance becoming CEPA Toxic.

The SNAc provisions trigger an obligation for a person to provide specific information when proposing to use the substance in a significant new activity. The Government will assess the information to determine whether the substance, if used in a significant new activity, could pose a risk to the environment or to human health and, if so, whether risk management is required.
Recent publication(s): Canada Gazette Part II, Vol. 145, No. 26, December 21 2011, SOR/2011-293
Date published: 2011-12-21
List or group: Domestic Substances List Categorization Results
Substance identifier: 123-31-9
Substance identifier (2):
Substance name: 1,4-Benzenediol
Additional information: Met the criteria under subsection 73(1) of the Canadian Environmental Protection Act, 1999 (CEPA).

For more information, please consult the Categorization of chemical substances web page and the Detailed categorization results of the Domestic Substances List found in Open Data.
Recent publication(s): Canadian Environmental Protection Act: categorization of existing substances
Date published: 2006-09-14
Date modified: