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Results for substance identifier "123-31-9"

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List or group: National Pollutant Release Inventory (NPRI)
Substance identifier: 123-31-9
Substance identifier (2):
Substance name: Hydroquinone (and its salts)
Additional information: This substance is listed in the NPRI with the following note: Total of the acid or base and its salts, expressed as the molecular weight of the acid or base. Where provided, the CAS RN corresponds to the weak acid or base.

NPRI Part (threshold category): 1A
Threshold for reporting to NPRI: 10 tonnes manufactured, processed or otherwise used
Concentration threshold: 1%
This substance has been reportable to the NPRI since: 1993

For more information, see the NPRI website.
Recent publication(s): Notices with respect to substances in the National Pollutant Release Inventory (NPRI)
Date published: 2025-03-08
List or group: Canadian Environmental Protection Act, 1999 Schedule 1 and Certain Substances
Substance identifier: 123-31-9
Substance identifier (2): 2 - 81
Substance name: 1,4-Benzenediol
Additional information: This substance is included in item 81 (1,4-Benzenediol, which has the molecular formula C6H6O2) on Part 2 of Schedule 1 of the Canadian Environmental Protection Act, 1999 (CEPA), as set out in the recent publications(s) listed below and/or in: Canada Gazette Part I, Vol. 142, No. 27, July 5, 2008 and Screening Assessment for the Challenge: 1,4-Benzenediol (Hydroquinone). The addition of a substance on Schedule 1 enables the Minister of the Environment and the Minister of Health to implement risk management measures under CEPA to manage potential environmental and human health risks that the substance may pose.

This item might include other substances that have not been identified in this Substances Search list. If a substance is added to Schedule 1, there could be associated risk management measures. For further information, see Toxic substances list.
Recent publication(s): Canada Gazette Part II, Vol. 144, No. 10, May 12, 2010, SOR/2010-98; Canada Gazette Part III, Vol. 46, No. 1, October 27, 2023, Chapter 12
Date published: 2023-10-27
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: Domestic Substances List (DSL)
Substance identifier: 123-31-9
Substance identifier (2):
Substance name: 1,4-Benzenediol
Additional information: This substance is on the Domestic Substances List (DSL).

The manufacture or import of a substance not on the DSL may be subject to notification under the New Substances Notification Regulations (Chemicals and Polymers) or the New Substances Notification Regulations (Organisms). Following notification, Environment and Climate Change Canada and Health Canada carry out a joint assessment process to determine whether there is a potential for adverse effects on the environment and human health.

This substance was added to the DSL as an “Existing Substance” given that it meets the criteria set out in CEPA for substances that were in commerce in Canada between 1984 and 1986.

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 toxic under CEPA.

The SNAc provisions of CEPA trigger an obligation for a person to provide the Government of Canada with information about a substance when proposing to use, import or manufacture the substance for a significant new activity. The government then assesses the substance for potential risks to the environment and/or human health. If risks are identified, the government may impose risk management measures.

To access all SNAc notices and orders published under the authority of CEPA, refer to Canada's Open Government Portal.
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 toxic under CEPA.

The SNAc provisions of CEPA trigger an obligation for a person to provide the Government of Canada with information about a substance when proposing to use, import or manufacture the substance for a significant new activity. The government then assesses the substance for potential risks to the environment and/or human health. If risks are identified, the government may impose risk management measures.

To access all SNAc notices and orders published under the authority of CEPA, refer to Canada's Open Government Portal.
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
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