History of reporting requirements: National Pollutant Release Inventory

Since the National Pollutant Release Inventory (NPRI) launched in 1993, the substance list and reporting requirements have continuously evolved. These changes happened to improve the data available to Canadians and other data users and followed the NPRI consultation process. The table below provides an overview of these changes.

Visit the Consultations page to view current and previous change proposals and find information on why these changes were made.

Impact of changes

Changes to the NPRI program can affect data trends and you should take this into consideration when using and analyzing NPRI data.

NPRI historical changes table

To narrow your results, type in a specific year, substance name, chemical abstract registry number (CAS RN) or change category. The searchable change categories are as follows:

  • Addition to the substance list
  • Deletion from the substance list
  • Modification to a listed substance
  • Adjustment to a reporting threshold
  • Change to reporting requirements
  • No change
Year Change category Description of the change
2019 No change N/A
2018 Addition to the substance list

Two substances were added to the Part 1B list with a mass threshold of 1,000 kg and concentration threshold of 1%:

  • Chlorinated alkanes, long-chain, CnHxCl(2n+2–x), 18 ≤ n ≤ 20
  • Chlorinated alkanes, medium-chain, CnHxCl(2n+2–x), 14 ≤ n ≤ 17

Six substances or groups of substances were added to the Part 5 (Speciated VOCs) list:

  • Analytically unresolved hydrocarbons (C10 to C16+)
  • Ethyltoluene (all isomers)
  • Methylcyclopentane (CAS RN 96-37-7)
  • Other glycol ethers and acetates (and their isomers)
  • Propyl acetate (all isomers)
  • n-Propyl alcohol (CAS RN 71-23-8)
2018 Deletion from the substance list

Ten substances were removed from the Part 1A list:

  • Alkanes, C6-18, chloro (CAS RN 68920-70-7)
  • Alkanes, C10-13, chloro (CAS RN 85535-84-8)
  • C.I. Solvent 14 (CAS RN 842-07-9)
  • 3-Chloropropionitrile (CAS RN 542-76-7)
  • Crotonaldehyde (CAS RN 4170-30-3)
  • 2,4-Diaminotoluene (and its salts) [CAS RN 95-80-7]
  • 2-Methylpyridine (CAS RN 109-06-8)
  • -Nitroaniline (CAS RN 100-01-6)
  • Nitrobenzene (CAS RN 98-95-3)
  • 2,4,4-Trimethylhexamethylene diisocyanate (CAS RN 15646-96-5)

Sixteen volatile organic compound species or isomer groups were deleted from the Part 5 list:

  • Aniline (and its salts) [CAS RN 62-53-3]
  • Anthraquinone (all isomers)
  • Chlorobenzene (CAS RN 108-90-7)
  • Creosote (CAS RN 8001-58-9)
  • Diethylene glycol butyl ether (CAS RN 112-34-5)
  • Diethylene glycol ethyl ether acetate (CAS RN 112-15-2)
  • Dihydronapthalene (all isomers)
  • Dodecane (all isomers)
  • Ethylene glycol butyl ether acetate (CAS RN 112-07-2)
  • Ethylene glycol hexyl ether (CAS RN 112-25-4)
  • 2-Methyl-3-hexanone (CAS RN 7379-12-6)
  • Methylindan (all isomers) [CAS RN 27133-93-3]
  • Phenyl isocyanate (CAS RN 103-71-9)
  • Propylene glycol butyl ether (CAS RN 5131-66-8)
  • Terpenes (all isomers) [CAS RN 68956-56-9]
  • Trimethylfluorosilane (CAS RN 420-56-4)
2018 Modification to a listed substance

The CAS RN for vanadium (and its compounds, except when in an alloy) was removed. Multiple CAS RNs can apply to this substance.

Benzo[a]phenanthrene is listed by its more common name, chrysene.

The listing of n-butyl acetate was changed to butyl acetate (all isomers) and includes three isomers: n-butyl acetate (CAS RN 123-86-4), isobutyl acetate (CAS RN 110-19-0), and sec-butyl acetate (CAS RN 105-46-4).

2018 Adjustment to a reporting threshold

Anthracene was moved from Part 1 A to Part 2. The 10 tonne mass reporting threshold was reduced to 50 kg for total polycyclic aromatic hydrocarbons, including anthracene, and 5 kg for reporting anthracene itself.

Facilities that are subject to the Chromium Electroplating, Chromium Anodizing and Reverse Etching Regulations must report releases, disposals and transfers for recycling of hexavalent chromium (and its compounds), regardless of the number of employees and regardless of the 50 kg mass threshold and 0.1% concentration threshold.

2018 Change to reporting requirements

Facilities classified under the NAICS Canada code 211110 (Oil and gas extraction, except oil sands) excluding compressor stations, with less than 20 000 employee hours, must report for all criteria air contaminants (CAC) and benzene from all sources if the reporting threshold for at least one CAC is met. Light and medium crude oil batteries of an oil throughput equal to or greater than 1900 m3 per year must report volatile organic compounds and benzene emissions from storage tanks, regardless of whether air release thresholds are met.

Facilities that report implementing a pollution prevention plan must report the name of the Pollution Prevention Planning Notice for which the plan was prepared. If the P2 plan was prepared or implemented for another government jurisdiction or program, the name of the jurisdiction, program, or requirement must be reported. Facilities that report not implementing new pollution prevention activities during the year must report any existing barriers to implementing a plan.

Facilities must report mercury and criteria air contaminant releases to air for each electricity generation unit that meet the following two criteria:

  1. The unit has a capacity of 25 MW or more.
  2. The unit distributes or sells to the grid 33% or more of its potential electrical output (during the current or previous years).

Facilities that meet the threshold requirements for unit-level reporting must also provide details about the unit, including:

  • unit gross generating capacity
  • commissioning year
  • technology or fuel type
  • whether the unit includes emissions from duct firing or other secondary combustion sources
  • air pollutant controls installed and operating on the unit

Facilities must report the following additional information on shutdown periods:

  1. Will the shutdown period occur at or around the same time in future years?
  2. Was the shutdown a partial or complete shutdown?

Facilities must report the geographical coordinates (latitude and longitude) of a stack in decimal degrees to at least five decimal places. Provincial identification numbers of each stack must also be provided, where applicable.

When total releases of a Part 1A substance are less than one tonne, a facility may choose to report the release as a total without specifying the environmental media (air, water, or land). Facilities are encouraged to report the break down by media, if the information is available.

2017 No change N/A
2016 Change to reporting requirements The requirement to report the concentration of substances released to surface waters was added. When a direct discharge to surface waters is reported, the average annual concentration (ppm) of the NPRI substance in the effluent must also be reported. Additional clarification for release estimates made using the method detection limit (MDL) also need to be provided, effective for 2016 reporting. This includes the MDL used in the estimation, where applicable.
2016 Adjustment to a reporting threshold Cobalt (and its compounds) was moved from Part 1, Group A to Part 1, Group B. The reporting thresholds for cobalt (and its compounds) were lowered to 50 kilograms with a 0.1% concentration threshold for quantities that are manufactured, processed or otherwise used from the original 10-tonne and 1% concentration thresholds.
2016 Deletion from the substance list Twenty-one substances have been removed from the Part 1, Group A list:
  • C.I. acid green 3 (CAS RN 4680-78-8)
  • C.I. basic red 1 (CAS RN 989-38-8)
  • C.I. direct blue 218 (CAS RN 28407-37-6)
  • C.I. food red 15 (CAS RN 81-88-9)
  • Calcium cyanamide (CAS RN 156-62-7)
  • Chlorendic acid (CAS RN 115-28-6)
  • Dimethyl phenol (CAS RN 1300-71-6)
  • 2,6-Dinitrotoluene (CAS RN 606-20-2)
  • Dinitrotoluene (mixed isomers) (CAS RN 25321-14-6)
  • Hexachloroethane (CAS RN 67-72-1)
  • Isosafrole (CAS RN 120-58-1)
  • p-Nitrophenol (and its salts) (CAS RN 100-02-7)
  • Paraldehyde (CAS RN 123-63-7)
  • Pentachloroethane (CAS RN 76-01-7)
  • o-Phenylphenol (and its salts) (CAS RN 90-43-7)
  • Propargyl alcohol (CAS RN 107-19-7)
  • p-Quinone (CAS RN 106-51-4)
  • Safrole (CAS RN 94-59-7)
  • Styrene oxide (CAS RN 96-09-3)
  • Tetracycline hydrochloride (CAS RN 64-75-5)
  • Vinylidene chloride (CAS RN 75-35-4)
2015 No change N/A
2014 Addition to the substance list Two substances were added to the substance list:
  • 2-(2-Methoxyethoxy)ethanol (CAS RN 111-77-3)
  • Thallium (and its compounds)
2014 Deletion from the substance list Five substances were deleted from the substance list:
  • Allyl chloride (CAS RN 107-05-1)
  • C.I. Solvent Orange 7 (CAS RN 3118-97-6)
  • 3-Chloro-2-methyl-1-propene (CAS RN 563-47-3)
  • Ethyl chloroformate (CAS RN 541-41-3)
  • 1-Bromo-2-chloroethane (CAS RN 107-04-0)
2014 Adjustment to a reporting threshold

Eight substances or substance groups have been moved from Part 1A to Part 1B. The mass threshold for these substances was reduced from 10 tonnes, and, in some cases, the concentration threshold was reduced from 1%. The substances are as follows:

  • Acrylonitrile (CAS RN 107-13-1)
  • Bisphenol A (CAS RN 80-05-7)
  • Hydrazine (and its salts) (CAS RN 302-01-2)
  • Isoprene (CAS RN 78-79-5)
  • Nonylphenol and its ethoxylates
  • Toluene-2,4-diisocyanate (CAS RN 584-84-9)
  • Toluene-2,6-diisocyanate (CAS RN 91-08-7)
  • Toluenediisocyanate (mixed isomers) (CAS RN 26471-62-5)

Quinoline (CASRN 91-22-5) was moved from Part 1A to Part 2 (polycyclic aromatic hydrocarbons). The 10 tonne mass threshold was reduced to 50 kilograms for total polycyclic aromatic hydrocarbons, including quinoline, and 5 kilograms for reporting quinoline itself.

2014 Change to a reporting requirement

The requirement to report releases to land and water, disposals, and transfers for recycling for total reduced sulphur was removed. Only releases of total reduced sulphur to air are required to be reported.

It was made explicit in the notice that underground releases are required to be reported. A requirement was added that the nature of the “other release” to land must be specified.

2013 No change N/A
2012 No change N/A
2011 Adjustment to a reporting threshold The reporting thresholds for selenium (and its compounds) were modified to 100 kilograms with a 0.000005% (0.05 ppm) concentration threshold for quantities that are manufactured, processed or otherwise used, from the original 10 tonne and 1% concentration thresholds.
2010 Modification to an existing substance The listing for p,p'-isopropylidenediphenol (CAS RN 80-05-7) was changed to bisphenol A (CAS RN 80-05-7). Only the substance name was changed; the reporting requirements for this substance were not changed.
2010 Deletion from the substance list Sulphur hexafluoride (CAS no. 2551-62-4) was deleted from the substance list.
2010 Change to reporting requirements

Provincial identification numbers for facilities in the upstream oil and gas sector are required to be reported.

Information related to updates of the pollution prevention plan, and whether the plan addresses energy or water conservation, is required to be reported.

The requirement to report the Canadian and United States Standard Industrial Classification (SIC) codes was removed.

The requirement to report on anticipated quantities of releases, disposals and recycling for each of the three subsequent years was removed.

2009 Change to reporting requirements Reporting requirements for substances contained in waste rock and tailings disposed of or transferred off-site for disposal were added. These requirements are also applicable to the 2006-2008 reporting years.
2008 Change to a reporting requirement "Titanium dioxide pigment production using the chloride process" was added to the list of activities for reporting of dioxins/furans and hexachlorobenzene.
2007 Addition to the substance list

Total reduced sulphur (TRS), expressed as hydrogen sulphide was added to Part 1A

Nine polycyclic aromatic hydrocarbons (PAHs) were added to Part 2

  • Dibenzo(a,h)acridine (CAS RN 226-36-8)
  • Dibenzo(a,e)fluoranthene (CAS RN 5385-75-1)
  • Dibenzo(a,e)pyrene (CAS RN 192-65-4)
  • Dibenzo(a,h)pyrene (CAS RN 189-64-0)
  • Dibenzo(a,l)pyrene (CAS RN 191-30-0)
  • 7,12-Dimethylbenz(a)anthracene (CAS RN 57-97-6)
  • 3-Methylcholanthrene (CAS RN 56-49-5)
  • 5-Methylchrysene (CAS RN 3697-24-3)
  • 1-Nitropyrene (CAS RN 5522-43-0)
2007 Modification to an existing substance

Dioxins and Furans as a group of substances was replaced by 17 Speciated Dioxins and Furans, as follows:

  • 2,3,7,8-Tetrachlorodibenzo-p-dioxin (CAS RN 1746-01-6)
  • 1,2,3,7,8-Pentachlorodibenzo-p-dioxin (CAS RN 40321-76-4)
  • 1,2,3,4,7,8-Hexachlorodibenzo-p-dioxin (CAS RN 39227-28-6)
  • 1,2,3,7,8,9-Hexachlorodibenzo-p-dioxin (CAS RN 19408-74-3)
  • 1,2,3,6,7,8-Hexachlorodibenzo-p-dioxin (CAS RN 57653-85-7)
  • 1,2,3,4,6,7,8-Heptachlorodibenzo-p-dioxin (CAS RN 35822-46-9)
  • Octachlorodibenzo-p-dioxin (CAS RN 3268-87-9)
  • 2,3,7,8-Tetrachlorodibenzofuran (CAS RN 51207-31-9)
  • 2,3,4,7,8-Pentachlorodibenzofuran (CAS RN 57117-31-4)
  • 1,2,3,7,8-Pentachlorodibenzofuran (CAS RN 57117-41-6)
  • 1,2,3,4,7,8-Hexachlorodibenzofuran (CAS RN 70648-26-9)
  • 1,2,3,7,8,9-Hexachlorodibenzofuran (CAS RN 72918-21-9)
  • 1,2,3,6,7,8-Hexachlorodibenzofuran (CAS RN 57117-44-9)
  • 2,3,4,6,7,8-Hexachlorodibenzofuran (CAS RN 60851-34-5)
  • 1,2,3,4,6,7,8-Heptachlorodibenzofuran (CAS RN 67562-39-4)
  • 1,2,3,4,7,8,9-Heptachlorodibenzofuran (CAS RN 55673-89-7)
  • Octachlorodibenzofuran (CAS RN 39001-02-0)
2007 Change to a reporting requirement

Pits and quarries, where annual production is 500 000 tonnes or more, are required to report to the NPRI - regardless of the number of hours worked by employees - provided that they meet the "manufacture, process or other use or release thresholds".

Emissions of total particulate matter, PM10 and PM2.5 from road dust are required to be included in threshold calculations for facilities where on-site annual vehicle travel on unpaved roads is over 10 000 kilometres.

There is the requirement to report on each of the 17 Dioxins and Furans separately, in grams. Previously, 17 dioxin and furan congeners were required to be reported as a group, in grams of toxic equivalents (TEQ).

For polycyclic aromatic hydrocarbons (PAHs), if the 50 kg threshold is met for the total of the listed PAHs, there is the requirement to report only for individual PAHs incidentally manufactured and released, disposed of or transferred off-site for recycling in amounts greater than or equal to 5 kg. All other quantities are to be reported as Total Unspeciated PAHs.

2006 Addition to the substance list

Three additional polycyclic aromatic hydrocarbons (PAHs) were added to Part 2

  • Acenaphthene (CAS RN 83-32-9)
  • Acenaphthylene (CAS RN 208-96-8)
  • Fluorene (CAS RN 86-73-7)

Fifteen speciated volatile organic compounds (VOCs) were added to Part 5

  • Furfuryl alcohol (CAS RN 98-00-0)
  • Tetrahydrofuran (CAS RN 109-99-9)
  • Heavy alkylate naphtha (CAS RN 64741-65-7)
  • Hydrotreated heavy naphtha (CAS RN 64742-48-9)
  • Hydrotreated light distillate (CAS RN 64742-47-8)
  • Solvent naphtha light aliphatic (CAS RN 64742-89-8)
  • Solvent naphtha medium aliphatic (CAS RN 64742-88-7)
  • VM & P naphtha (CAS RN 8032-32-4)
  • White mineral oil (CAS RN 8042-47-5)
  • Diethylene glycol butyl ether (CAS RN 112-34-5)
  • Diethylene glycol ethyl ether acetate (CAS RN 112-15-2)
  • Ethylene glycol butyl ether acetate (CAS RN 112-07-2)
  • Ethylene glycol hexyl ether (CAS RN 112-25-4)
  • Propylene glycol butyl ether (CAS RN 5131-66-8)
  • Propylene glycol methyl ether acetate (CAS RN 108-65-6)
2006 Change to a reporting requirement

The exemption was removed for reporting Part 1 to 3 substances from extraction and primary crushing in mines (except for pits and quarries).

Reporting of NPRI substances is required from portable facilities, which means portable polychlorinated biphenyls (PCB) destruction equipment, portable asphalt plants, and portable concrete batching plants.

The definition of "other use" was expanded to include "release" of an NPRI substance. "Other use" means, in respect of a substance listed in Schedule 1 of the Canada Gazette notice, any use, disposal or release of that substance which is not included in the definitions of "manufacture" or "process".

There is a mandatory reporting of latitude and longitude coordinates if the facility is portable or if it is reporting for the first time.

There are new requirements for facilities to provide updates about changes to contact information and ownership.

If facilities are already required by federal or provincial legislation or by a municipal by-law to measure or monitor releases, disposals and/or transfers for recycling of any listed substances, they are also required to report this data to the NPRI.

2005 No Change N/A
2004   No Change N/A
2003 Addition to the substance list

Carbonyl sulphide (CAS No. 463-58-1) and Phosphorous (total) were added to Part 1A

Sixty selected Volatile Organic Compound (VOC) substances with additional reporting criteria were added under Part 5, with a 1 tonne release to air reporting threshold

  • Acetylene (CAS RN 74-86-2)
  • Adipic acid (CAS RN 124-04-9)
  • Aniline (and its salts) (CAS RN 62-53-3)
  • Benzene (CAS RN 71-43-2)
  • 1,3-Butadiene (CAS RN 106-99-0)
  • 2-Butoxyethanol (CAS RN 111-76-2)
  • n-Butyl acetate (CAS RN 123-86-4)
  • Chlorobenzene (CAS RN 108-90-7)
  • p-Dichlorobenzene (CAS RN 106-46-7)
  • 1,2-Dichloroethane (CAS RN 107-06-2)
  • Dimethylether (CAS RN 115-10-6)
  • Ethyl alcohol (CAS RN 64-17-5)
  • Ethyl acetate (CAS RN 141-78-6)
  • Ethylene (CAS RN 74-85-1)
  • Formaldehyde (CAS RN 50-00-0)
  • n-Hexane (CAS RN 110-54-3)
  • Isopropyl alcohol (CAS RN 67-63-0)
  • D-Limonene (CAS RN 5989-27-5)
  • Methanol (CAS RN 67-56-1)
  • Methyl ethyl ketone (CAS RN 78-93-3)
  • 2-Methyl-3-hexanone (CAS RN 2001505)
  • Methyl isobutyl ketone (CAS RN 108-10-1)
  • Myrcene (CAS RN 123-35-3)
  • Beta-Phellandrene (CAS RN 555-10-2)
  • Phenyl isocyanate (CAS RN 103-71-9)
  • Alpha-Pinene (CAS RN 80-56-8)
  • Beta-Pinene (CAS RN 127-91-3)
  • Propane (CAS RN 74-98-6)
  • Propylene (CAS RN 115-07-1)
  • Styrene (CAS RN 100-42-5)
  • 1,2,4-Trimethylbenzene (CAS RN 95-63-6)
  • Trimethylfluorosilane (CAS RN 420-56-4)
  • Toluene (CAS RN 108-88-3)
  • Vinyl acetate (CAS RN 108-05-4)
  • Anthraquinone (all isomers)
  • Butane (all isomers)
  • Butene (all isomers) (CAS RN 25167-67-3)
  • Cycloheptane (all isomers)
  • Cyclohexene (all isomers)
  • Cyclooctane (all isomers)
  • Decane (all isomers)
  • Dihydronapthalene (all isomers)
  • Dodecane (all isomers)
  • Heptane (all isomers)
  • Hexane (all isomers, excluding n-hexane)
  • Hexene (all isomers) (CAS RN 25264-93-1)
  • Methylindan (all isomers) (CAS RN 27133-93-3)
  • Nonane (all isomers)
  • Octane (all isomers)
  • Pentane (all isomers)
  • Pentene (all isomers)
  • Terpene (all isomers) (CAS RN 68956-56-9)
  • Trimethylbenzene (all isomers, excluding 1, 2, 4-trimethylbenzene) (CAS RN 25551-13-7)
  • Xylene (all isomers) (CAS RN 1330-20-7)
  • Creosote (CAS RN 8001-58-9)
  • Heavy aromatic solvent naphtha (CAS RN 64742-94-5)
  • Light aromatic solvent naphtha (CAS RN 64742-95-6)
  • Mineral spirits (CAS RN 64475-85-0)
  • Naphtha (CAS RN 8030-30-6)
  • Stoddard solvent (CAS RN 8052-41-3)
2003 Modification to an existing substance

Thirteen individually listed nonylphenols and ethoxylates were replaced by "Nonylphenol and its ethoxylates". This grouping includes additional nonylphenols, ethoxylates and derivatives not listed in 2002. The following substances were replaced by the grouping:

  • Ethoxynonyl benzene (CAS RN 28679-13-12)
  • Nonylphenol (CAS RN 104-40-5)
  • Nonylphenol hepta (oxyethylene) ethanol (CAS RN 27177-05-5)
  • Nonylphenol, industrial (CAS RN 84852-15-3)
  • Nonylphenol, nona (oxyethylene) ethanol (CAS RN 27177-08-8)
  • n-Nonylphenol (CAS RN 25154-52-3)
  • Nonylphenol polyethylene glycol ether (CAS RN 9016-45-9)
  • p-Nonylphenol polyethylene glycol ether (CAS RN 26027-38-3)
  • Nonylphenoxy ethanol (CAS RN 27986-36-3)
  • 2-(p-Nonylphenoxy)ethanol (CAS RN 104-35-8)
  • 2-(2-(p-Nonylphenoxy)ethoxy)ethanol (CAS RN 20427-84-3)
  • 2-(2-(2-(2-(p-Nonylphenoxy)ethoxy)ethoxy)ethoxy)ethanol (CAS RN 7311-27-5)
  • Oxirane, methyl-, polymer with oxirane, mono(nonylphenol)ether (CAS RN 37251-69-7)

4-tert-octylphenol was replaced by "Octylphenol and its ethoxylates" as a group. This grouping includes additional octylphenols and ethoxylates not listed in 2002.

2003 Reporting requirements

The exemption for emissions from activities related to the operation of oil and gas wells was removed. The exemption for oil and gas exploration and well drilling was not affected.

Mandatory reporting by facilities of their Business Number was added. Business Numbers (nine-digit registration number) can be found on all forms that are issued to a business by the Canada Customs and Revenue Agency.

The definition of a facility was expanded to include "offshore installations", as well as pipeline installations and contiguous facilities.

2002 Addition to the substance list

Seven Criteria Air Contaminants (CACs) were added to Part 4 of the substance list

  • Carbon monoxide (CAS RN 630-08-0)
  • Oxides of nitrogen (CAS RN 11104-93-1)
  • Sulphur dioxide (CAS RN 7446-09-5)
  • Total particulate matter (TPM)
  • Particulate Matter less than or equal to 2.5 Microns (PM2.5)
  • Particulate Matter less than or equal to 10 Microns (PM10)
  • Volatile Organic Compounds (VOCs)
2002 Modification to an existing substance

The listing for Chromium (and its compounds) was updated with separate entries for:

  • Chromium (and its compounds, except for hexavalent chromium
  • Hexavalent chromium compounds (reporting threshold at 50 kg and 0.1% concentration)
2002 Adjustment to a reporting threshold

The reporting thresholds for the following substances were modified from the original 10-tonne and 1% concentration thresholds. The following substances are now listed on Part 1B:

  • Cadmium (and its compounds) (5 kg with 0.1% concentration criterion)
  • Arsenic (and its compounds) (50 kg with 0.1% concentration criterion)
  • Lead (and its compounds, except tetraethyl lead) (50 kg with 0.1% concentration criterion)
  • Tetraethyl lead (50 kg with 0.1% concentration criterion)
  • Mercury (and its compounds) (5 kg)

The 20 000-hour employee threshold is no longer applicable to the following:

  • Non-hazardous solid waste incineration and biomedical or hospital waste incineration of at least 26 tonnes (reduced from 100 tonnes)
  • Terminal operations
  • Discharge of treated or untreated wastewater from a wastewater collection system with an average discharge of 10,000 m³ or more per day into surface waters
2002 Change to reporting requirements

The following were exempted:

  • Maintenance and repair of transportation vehicles, such as automobiles, trucks, locomotives, ships or aircraft, except painting and stripping of vehicles or their components, or the rebuilding or remanufacturing of vehicle components
  • Distribution, storage or retail sale of fuels, except as part of the terminal operations

More detailed reporting on pollution prevention activities was added (e.g. the specific type of equipment or process modifications carried out).

Facilities that reported in the previous year must advise Environment Canada if they do not meet the NPRI reporting criteria for the current year.

The following definitions were changed:

  • The definition of "by-product" was revised to mean a substance that is incidentally manufactured, processed or otherwise used at the facility at any concentration, and released on-site to surface waters or transferred off-site for disposal.
  • The definition of "facility" was revised to refer to a contiguous facility and pipeline installation.
  • The definition of "other use" was revised to mean any use or disposal of a substance, listed in Schedule 1 of the NPRI Canada Gazette notice, relevant to the purpose of the facility that is not included under the definitions of “manufacture” or “process”.
2001 Addition to the substance list

The following substance was added to Part 1A of the substance list:

  • N,N-Dimethylformamide (CAS RN 68-12-2)
2001 Modification to an existing substance

The following substances were modified:

  • Amalgamation of the individual isomers of cresol (m-, o- and p-cresol) to Cresol (all isomers and their salts)
  • Modification of Vanadium (fume or dust) (CAS RN 7440-62-2) to Vanadium (except when in an alloy) and its compounds (CAS RN 7440-62-2)
2001 Deletion from the substance list

The following substance was deleted from the substance list:

  • Phosphoric acid (CAS No. 7664-38-2)
2001 Change to reporting requirements

The following groupings were used to summarize information collected through the NPRI beginning with the 2001 reporting year:

  • On-site pollutant releases:
    • air
    • water
    • land: includes spills, leaks and other
  • Disposal:
    • on-site disposal: landfill, land treatment and underground injection
    • off-site disposal: landfill, land treatment, underground injection and storage
  • Off-site transfers for treatment prior to final disposal:
    • physical treatment
    • chemical treatment
    • biological treatment
    • incineration or thermal treatment where energy is not recovered
    • treatment at a municipal sewage treatment plant (MSTP)
  • Off-site transfers for recycling and energy recovery:
    • recycling
    • energy recovery

The requirement for persons reporting to the NPRI to retain copies of all information upon which their report was based, at the facility or parent company (in Canada), for three years was added.

2000 Addition to the substance list

The following substances were added to Part 1A of the substance list:

  • Acrolein (CAS RN 107-02-8)
  • 4-tert-octylphenol (CAS RN 140-66-9)
  • Polymeric diphenylmethane diisocyanate (PMDI) (CAS RN 9016-87-9)

The following was added to Part 1B of the substance list:

  • Oxirane, methyl-, polymer with oxirane, mono(nonylphenol)ether (CAS RN 37251-96-7)

The following was added to Part 3 of the substance list:

  • Polychlorinated dibenzo-p-dioxins (dioxins) and Polychlorinated dibenzofurans (furans)
  • Hexachlorobenzene (HCB) (CAS RN 118-74-1)

Seventeen Polycyclic Aromatic Hydrocarbons (PAHs) were added to Part 2 of the substance list:

  • Benzo(a)anthracene (CAS RN 56-55-3)
  • Benzo(a)phenanthrene (CAS RN 218-01-9)
  • Benzo(a)pyrene (CAS RN 50-32-8)
  • Benzo(b)fluoranthene (CAS RN 205-99-2)
  • Benzo(e)pyrene (CAS RN 192-97-2)
  • Benzo(g,h,i)perylene (CAS RN 191-24-2)
  • Benzo(j)fluoranthene (CAS RN 205-82-3)
  • Benzo(k)fluoranthene (CAS RN 207-08-9)
  • Dibenz(a,j)acridine (CAS RN 224-42-0)
  • Dibenzo(a,h)anthracene (CAS RN 53-70-3)
  • Dibenzo(a,i)pyrene (CAS RN 189-55-9)
  • 7H-Dibenzo(c,g)carbazole (CAS RN 194-59-2)
  • Fluoranthene (CAS RN 206-44-0)
  • Indeno(1,2,3-c,d)pyrene (CAS RN 193-39-5)
  • Perylene (CAS RN 198-55-0)
  • Phenanthrene (CAS RN 85-01-8)
  • Pyrene (CAS RN 129-00-0)
2000 Adjustment to a reporting threshold

The reporting thresholds were modified for many substances from the original 10-tonne and 1% by weight concentration thresholds:

  • Significant changes were made regarding the reporting thresholds of substances that pose serious risks to human health or the environment in relatively low quantities. Alternate thresholds were applied to Polycyclic Aromatic Hydrocarbons (PAHs), dioxins and furans, hexachlorobenzene and mercury (and its compounds).
2000 Change to reporting requirements

The 20 000-hour employee threshold was removed for facilities used for wood preservation and certain types of incineration.

Facilities in 10 different categories were made exempt from reporting, including those involved exclusively in research or testing, mining (but not processing of mined materials), and drilling and operating oil and gas wells.

1999 Addition to the substance list

73 substances were added to the substance list:

  • 1,1,1,2-Tetrachloroethane (CAS RN 630-20-6)
  • 1,1-Methylenebis(4-isocyanatocyclohexane) (CAS RN 5124-30-1)
  • 1-Bromo-2-chloroethane (CAS RN 107-04-0)
  • 2-(p-Nonylphenoxy)ethanol (CAS RN 104-35-8)
  • 2,2,4-Trimethylhexamethylene diisocyanate (CAS RN 16938-22-0)
  • 2,4,4-Trimethylhexamethylene diisocyanate (CAS RN 15646-96-5)
  • 2,6-Di-t-butyl-4-methylphenol (CAS RN 128-37-0)
  • 2-[2-(p-Nonylphenoxy)ethoxy]ethanol (CAS RN 20427-84-3)
  • 2-[2-[2-[2-(p-Nonylphenoxy)ethoxy)ethoxy (CAS RN 7311-27-5)
  • 2-Mercaptobenzothiazole (CAS RN 149-30-4)
  • 2-Methylpyridine (CAS RN 109-06-8)
  • 3,3'-Dichlorobenzidine dihydrochloride (CAS RN 612-83-9)
  • 3-Chloro-2-methyl-1-propene (CAS RN 563-47-3)
  • 3-Chloropropionitrile (CAS RN 542-76-7)
  • Acetophenone (CAS RN 98-86-2)
  • Alkanes, C10-13, chloro (CAS RN 85535-84-8)
  • Alkanes, C6-18, chloro (CAS RN 68920-70-7)
  • Boron trifluoride (CAS RN 2095581)
  • Bromine (CAS RN 7726-95-6)
  • Bromochlorodifluoromethane (Halon 1211) (CAS RN 353-59-3)
  • Bromotrifluoromethane (Halon 1301) (CAS RN 75-63-8)
  • Butyl cellosolve (CAS RN 111-76-2)
  • C.I. Direct Blue 218 (CAS RN 28407-37-6)
  • Calcium fluoride (CAS RN 7789-75-5)
  • Chlorendic acid (CAS RN 115-28-6)
  • Chloropentafluoroethane (CFC-115) (CAS RN 76-15-3)
  • Chlorotrifluoromethane (CAS RN 75-72-9)
  • Crotonaldehyde (CAS RN 4170-30-3)
  • Cyclohexanol (CAS RN 108-93-0)
  • Dichlorodifluoromethane (CFC-12) (CAS RN 75-71-8)
  • Dichlorofluoroethane (HCFC-141) (CAS RN 1717-00-6)
  • Dichlorotetrafluoroethane (CFC-114) (CAS RN 76-14-2)
  • Dicyclopentadiene (CAS RN 77-73-6)
  • Dimethylamine (CAS RN 124-40-3)
  • Dimethylphenol (mixed isomers) (CAS RN 1300-71-6)
  • Diphenylamine (CAS RN 122-39-4)
  • Ethoxynonyl benzene (CAS RN 28679-13-2)
  • Fluorine (CAS RN 7782-41-4)
  • Formic acid (CAS RN 64-18-6)
  • HCFC-122 (and all isomers) (CAS RN 41834-16-6)
  • HCFC-123 (and all isomers) (CAS RN 34077-87-7)
  • HCFC-124 (and all isomers) (CAS RN 63938-10-3)
  • Hexachlorophene (CAS RN 70-30-4)
  • Hydrochlorodifluoromethane (HCFC-22) (CAS RN 75-45-6)
  • Hydrogen sulphide (CAS RN 2148878)
  • Hydrotrichlorodifluoroethane (HCFC-142B) (CAS RN 75-68-3)
  • Iron pentacarbonyl (CAS RN 13463-40-6)
  • Isophorone diisocyanate (CAS RN 4098-71-9)
  • Isoprene (CAS RN 78-79-5)
  • Lithium carbonate (CAS RN 554-13-2)
  • n-Hexane (CAS RN 110-54-3)
  • n-Methyl pyrrolidone (CAS RN 872-50-4)
  • N-Methylolacrylamide (CAS RN 924-42-5)
  • n-Nonylphenol (mixed isomers) (CAS RN 25154-52-3)
  • Nonylphenol (CAS RN 104-40-5)
  • Nonylphenol hepta(oxyethylene) ethanol (CAS RN 27177-05-5)
  • Nonylphenol nona(oxyethylene) ethanol (CAS RN 27177-08-8)
  • Nonylphenol polyethylene glycol ether (CAS RN 9016-45-9)
  • Nonylphenol, industrial (CAS RN 84852-15-3)
  • Nonylphenoxy ethanol (CAS RN 27986-36-3)
  • p-Nitroaniline (CAS RN 100-01-6)
  • p-Nonylphenol polyethylene glycol ether (CAS RN 26027-38-3)
  • Paraldehyde (CAS RN 123-63-7)
  • Pentachloroethane (CAS RN 76-01-7)
  • Potassium bromate (CAS RN 2139594)
  • Propargyl alcohol (CAS RN 107-19-7)
  • Sodium fluoride (CAS RN 7681-49-4)
  • Sodium nitrite (CAS RN 7632-00-0)
  • Sulphur hexafluoride (CAS RN 2551-62-4)
  • Tetracycline hydrochloride (CAS RN 64-75-5)
  • Tetraethyl lead (CAS RN 78-00-2)
  • Trichlorofluoromethane (CFC-11) (CAS RN 75-69-4)
  • Triethylamine (CAS RN 121-44-8)
1999 Modification to an existing substance There was the amalgamation of the individual isomers of xylene (m-, o- and p-xylene) to Xylene (mixed isomers).
1999 Deletion from the substance list Acetone (CAS RN 67-64-1) was deleted from the substance list.
1999 Change to reporting requirements Reporting of the Dun and Bradstreet Number was added to allow easier identification of corporate structures and the relation of facilities to their parent companies.
1998 Change to reporting requirements

Reporting of the quantities of substances transferred off-site for recycling, the nature of the recycling activity, and the name and address of the receiving facility was made mandatory.

Facilities must indicate estimation methods for disposals or recycling.

The NAICS (North American Industry Classification System) was adopted as the standard for identifying industrial sectors to enable better comparisons of NPRI data with United States and Mexican data. There was also the continued collection from reporting facilities of Canadian and U.S. Standard Industrial Classification (SIC) codes.

1997 Change to reporting requirements

Reporting of qualitative pollution prevention (P2) activities was made mandatory.

There is also mandatory reporting of the reasons for transferring substances off-site, off-site disposal activities and, optionally, off-site recycling activities.

Reporters were asked to voluntarily provide a production ratio or activity index to help explain the trends in historical environmental releases and waste transfers.

1996 Modification to a listed substance Modification of "Nitrate ion in solution at a pH of 6.5 or greater" to "Nitrate ion in solution at a pH of 6.0 or greater."
1995 Addition to the substance list Nitrate ion in solution with a pH of 6.5 or more was added to Part 1A of the substance list
1995 Modification to a listed substance

The listings for 22 substances were modified as follows:

The qualifier "and its salts" was added to the listings for 20 substances in order to collect more comprehensive information, as follows:

  • Acrylic acid (and its salts) (CAS RN 79-10-7)
  • Aniline (and its salts) (CAS RN 62-53-3)
  • Chloroacetic acid (and its salts) (CAS RN 79-11-8)
  • 2,4-Diaminotoluene (and its salts) (CAS RN 95-80-7)
  • 2,4-Dichlorophenol (and its salts) (CAS RN 120-83-2)
  • Diethanolamine (and its salts) (CAS RN 111-42-2)
  • N,N-Dimethylaniline (and its salts) (CAS RN 121-69-7)
  • 4,6-Dinitro-o-cresol (and its salts) (CAS RN 534-52-1)
  • Hydrazine (and its salts) (CAS RN 302-01-2)
  • Hydroquinone (and its salts) (CAS RN 123-31-9)
  • Michler's ketone (and its salts) (CAS RN 90-94-8)
  • Nitrotriacetic acid (and its salts) (CAS RN 139-13-9)
  • p-Nitrophenol (and its salts) (CAS RN 100-02-7)
  • Peracetic acid (and its salts) (CAS RN 79-21-0)
  • Phenol (and its salts) (CAS RN 108-95-2)
  • p-Phenylenediamine (and its salts) (CAS RN 106-50-3)
  • o-Phenylphenol (and its salts) (CAS RN 90-43-7)
  • Pyridine (and its salts) (CAS RN 110-86-1)
  • Quinoline (and its salts) (CAS RN 91-22-5)

The entry for asbestos was clarified to include only the friable form.

The individual entries for ammonia, ammonium nitrate and ammonium sulphate in solution were replaced with a single entry for ammonia (total).

The qualifiers for zinc was changed from "fume or dust" to "and its compounds” (CAS RN 7440-66-6).

1995 Change to reporting requirements

The by-product definition was added. The weight of the by-product must be used in the calculation of the 10-tonne reporting threshold, regardless of the concentration.

There is a requirement to report all discharges to sanitary sewers as a transfer to a municipal sewage treatment plant, regardless of the level of treatment. (Previously discharges with only primary treatment were considered releases to water bodies).

The rounding of releases of less than 0.5 tonnes to 0 (zero) was no longer permitted; a release of 0 (zero) was allowed only where there are absolutely no releases.

1994 Addition to the substance list; i-Butyl alcohol (CAS No. 78-83-1) was added to Part 1A.
1994 Deletion from the substance list Chloromethyl methyl ether (CAS No. 107-30-2) was deleted from Part 1
1994 Change to a reporting requirement

A permanent NPRI identification number (ID) was assigned to each facility that reported in 1993.

Facilities must report one facility public contact and a company coordinator.

The reporting of one Canadian and one American Standard Classification Code (SIC) per facility was added.

Biological and chemical treatment were added to "disposal method".

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