Changes to the National Pollutant Release Inventory (NPRI) Substance List over time

The following tables show the changes that have been made to the NPRI substance list over time. Changes to the substance list result from the NPRI Consultations process and may include the addition, modification or removal of substances as well as changes in the thresholds at which they must be reported. A chronological list of all types of changes made to the NPRI since 1993 is also available, here.

General Notes:

Abbreviations:

PAHs = Polycyclic aromatic hydrocarbons

VOCs = Volatile Organic Compounds

The Chemical Abstracts Service (CAS) Registry Number (CAS RN) is the property of the American Chemical Society and any use or redistribution, except as required in supporting regulatory requirements and/or for reports to the Government when the information and the reports are required by law or administrative policy, is not permitted without the prior, written permission of the American Chemical Society.

* Specifies that no single CAS RN applies to this substance.


Table of Contents


Substances Added to the NPRI

Additions to the NPRI Substance List over time

Reporting YearCAS NumberSubstancePart # (Threshold Category)
2014111-77-32-(2-Methoxyethoxy)ethanol1A
2014*Thallium (and its compounds)1B
2007NA - M14Total reduced sulphur1A
2007226-36-8Dibenzo(a,h)acridine2 (PAHs)
20075385-75-1Dibenzo(a,e)fluoranthene2 (PAHs)
2007192-65-4Dibenzo(a,e)pyrene2 (PAHs)
2007189-64-0Dibenzo(a,h)pyrene2 (PAHs)
2007191-30-0Dibenzo(a,l)pyrene2 (PAHs)
200757-97-67,12-Dimethylbenz(a)anthracene2 (PAHs)
200756-49-53-Methylcholanthrene2 (PAHs)
20073697-24-35-Methylchrysene2 (PAHs)
20075522-43-01-Nitropyrene2 (PAHs)
200683-32-9Acenaphthene2 (PAHs)
2006208-96-8Acenaphthylene2 (PAHs)
200686-73-7Fluorene2 (PAHs)
200698-00-0Furfuryl alcohol5 (VOCs, Individual Substances)
2006109-99-9Tetrahydrofuran5 (VOCs, Individual Substances)
200664741-65-7Heavy alkylate naphtha5 (VOCs, Other Groups and Mixtures)
200664742-48-9Hydrotreated heavy naphtha5 (VOCs, Other Groups and Mixtures)
200664742-47-8Hydrotreated light distillate5 (VOCs, Other Groups and Mixtures)
200664742-89-8Solvent naphtha light aliphatic5 (VOCs, Other Groups and Mixtures)
200664742-88-7Solvent naphtha medium aliphatic5 (VOCs, Other Groups and Mixtures)
20068032-32-4VM & P naphtha5 (VOCs, Other Groups and Mixtures)
20068042-47-5White mineral oil5 (VOCs, Other Groups and Mixtures)
2006112-34-5Diethylene glycol butyl ether5 (VOCs, Other Groups and Mixtures)
2006112-15-2Diethylene glycol ethyl ether acetate5 (VOCs, Other Groups and Mixtures)
2006112-07-2Ethylene glycol butyl ether acetate5 (VOCs, Other Groups and Mixtures)
2006112-25-4Ethylene glycol hexyl ether5 (VOCs, Other Groups and Mixtures)
20065131-66-8Propylene glycol butyl ether5 (VOCs, Other Groups and Mixtures)
2006108-65-6Propylene glycol methyl ether acetate5 (VOCs, Other Groups and Mixtures)
2003463-58-1Carbonyl sulphide1A
2003*Phosphorous (total)1A
200374-86-2Acetylene5 (VOCs, Individual Substances)
2003124-04-9Adipic acid5 (VOCs, Individual Substances)
200362-53-3Aniline (and its salts)5 (VOCs, Individual Substances)
200371-43-2Benzene5 (VOCs, Individual Substances)
2003106-99-01,3-Butadiene5 (VOCs, Individual Substances)
2003111-76-22-Butoxyethanol5 (VOCs, Individual Substances)
2003123-86-4n-Butyl acetate5 (VOCs, Individual Substances)
2003108-90-7Chlorobenzene5 (VOCs, Individual Substances)
2003106-46-7p-Dichlorobenzene5 (VOCs, Individual Substances)
2003107-06-21,2-Dichloroethane5 (VOCs, Individual Substances)
2003115-10-6Dimethylether5 (VOCs, Individual Substances)
200364-17-5Ethyl alcohol5 (VOCs, Individual Substances)
2003141-78-6Ethyl acetate5 (VOCs, Individual Substances)
200374-85-1Ethylene5 (VOCs, Individual Substances)
200350-00-0Formaldehyde5 (VOCs, Individual Substances)
2003110-54-3n-Hexane5 (VOCs, Individual Substances)
200367-63-0Isopropyl alcohol5 (VOCs, Individual Substances)
20035989-27-5D-Limonene5 (VOCs, Individual Substances)
200367-56-1Methanol5 (VOCs, Individual Substances)
200378-93-3Methyl ethyl ketone5 (VOCs, Individual Substances)
20037379-12-62-Methyl-3-hexanone5 (VOCs, Individual Substances)
2003108-10-1Methyl isobutyl ketone5 (VOCs, Individual Substances)
2003123-35-3Myrcene5 (VOCs, Individual Substances)
2003555-10-2Beta-Phellandrene5 (VOCs, Individual Substances)
2003103-71-9Phenyl isocyanate5 (VOCs, Individual Substances)
200380-56-8Alpha-Pinene5 (VOCs, Individual Substances)
2003127-91-3Beta-Pinene5 (VOCs, Individual Substances)
200374-98-6Propane5 (VOCs, Individual Substances)
2003115-07-1Propylene5 (VOCs, Individual Substances)
2003100-42-5Styrene5 (VOCs, Individual Substances)
200395-63-61,2,4-Trimethylbenzene5 (VOCs, Individual Substances)
2003420-56-4Trimethylfluorosilane5 (VOCs, Individual Substances)
2003108-88-3Toluene5 (VOCs, Individual Substances)
2003108-05-4Vinyl acetate5 (VOCs, Individual Substances)
2003*Anthraquinone (all isomers)5 (VOCs, Isomer Groups)
2003*Butane (all isomers)5 (VOCs, Isomer Groups)
200325167-67-3Butene (all isomers)5 (VOCs, Isomer Groups)
2003*Cycloheptane (all isomers)5 (VOCs, Isomer Groups)
2003*Cyclohexene (all isomers)5 (VOCs, Isomer Groups)
2003*Cyclooctane (all isomers)5 (VOCs, Isomer Groups)
2003*Decane (all isomers)5 (VOCs, Isomer Groups)
2003*Dihydronapthalene (all isomers)5 (VOCs, Isomer Groups)
2003*Dodecane (all isomers)5 (VOCs, Isomer Groups)
2003*Heptane (all isomers)5 (VOCs, Isomer Groups)
2003*Hexane (all isomers, excluding n-hexane)5 (VOCs, Isomer Groups)
200325264-93-1Hexene (all isomers)5 (VOCs, Isomer Groups)
200327133-93-3Methylindan (all isomers)5 (VOCs, Isomer Groups)
2003*Nonane (all isomers)5 (VOCs, Isomer Groups)
2003*Octane (all isomers)5 (VOCs, Isomer Groups)
2003*Pentane (all isomers)5 (VOCs, Isomer Groups)
2003*Pentene (all isomers)5 (VOCs, Isomer Groups)
200368956-56-9Terpene (all isomers)5 (VOCs, Isomer Groups)
200325551-13-7Trimethylbenzene (all isomers, excluding 1, 2, 4-trimethylbenzene)5 (VOCs, Isomer Groups)
20031330-20-7Xylene (all isomers)5 (VOCs, Isomer Groups)
20038001-58-9Creosote5 (VOCs, Other Groups and Mixtures)
200364742-94-5Heavy aromatic solvent naphtha5 (VOCs, Other Groups and Mixtures)
200364742-95-6Light aromatic solvent naphtha5 (VOCs, Other Groups and Mixtures)
200364475-85-0Mineral spirits5 (VOCs, Other Groups and Mixtures)
20038030-30-6Naphtha5 (VOCs, Other Groups and Mixtures)
20038052-41-3Stoddard solvent5 (VOCs, Other Groups and Mixtures)
2002630-08-0Carbon monoxide4
200211104-93-1Oxides of nitrogen4
20027446-09-5Sulphur dioxide4
2002*Total particulate matter (TPM)4
2002*Particulate Matter less than or equal to 2.5 Microns (PM2.5)4
2002*Particulate Matter less than or equal to 10 Microns (PM10)4
2002*Volatile Organic Compounds (VOCs)4
200168-12-2N,N-Dimethylformamide1A
2000107-02-8Acrolein1A
2000140-66-94-tert-octylphenol1A
200037251-96-7Oxirane, methyl-, polymer with oxirane, mono(nonylphenol)ether1B
20009016-87-9Polymeric diphenylmethane diisocyanate (PMDI)1A
2000*Polychlorinated dibenzo-p-dioxins (dioxins) and Polychlorinated dibenzofurans (furans)3
2000118-74-1Hexachlorobenzene (HCB)3
200056-55-3Benzo(a)anthracene2
2000218-01-9Benzo(a)phenanthrene2
200050-32-8Benzo(a)pyrene2
2000205-99-2Benzo(b)fluoranthene2
2000192-97-2Benzo(e)pyrene2
2000191-24-2Benzo(g,h,i)perylene2
2000205-82-3Benzo(j)fluoranthene2
2000207-08-9Benzo(k)fluoranthene2
2000224-42-0Dibenz(a,j)acridine2
200053-70-3Dibenzo(a,h)anthracene2
2000189-55-9Dibenzo(a,i)pyrene2
2000194-59-27H-Dibenzo(c,g)carbazole2
2000206-44-0Fluoranthene2
2000193-39-5Indeno(1,2,3-c,d)pyrene2
2000198-55-0Perylene2
200085-01-8Phenanthrene2
2000129-00-0Pyrene2
1999630-20-61,1,1,2-Tetrachloroethane1A
19995124-30-11,1-Methylenebis(4-isocyanatocyclohexane)1A
1999107-04-01-Bromo-2-chloroethane1A
1999104-35-82-(p-Nonylphenoxy)ethanol1B
199916938-22-02,2,4-Trimethylhexamethylene diisocyanate1A
199915646-96-52,4,4-Trimethylhexamethylene diisocyanate1A
1999128-37-02,6-Di-t-butyl-4-methylphenol1A
199920427-84-32-[2-(p-Nonylphenoxy)ethoxy]ethanol1B
19997311-27-52-[2-[2-[2-(p-Nonylphenoxy)ethoxy)ethoxy1B
1999149-30-42-Mercaptobenzothiazole1A
1999109-06-82-Methylpyridine1A
1999612-83-93,3'-Dichlorobenzidine dihydrochloride1A
1999563-47-33-Chloro-2-methyl-1-propene1A
1999542-76-73-Chloropropionitrile1A
199998-86-2Acetophenone1A
199985535-84-8Alkanes, C10-13, chloro1A
199968920-70-7Alkanes, C6-18, chloro1A
19997637-07-2Boron trifluoride1A
19997726-95-6Bromine1A
1999353-59-3Bromochlorodifluoromethane (Halon 1211)1A
199975-63-8Bromotrifluoromethane (Halon 1301)1A
1999111-76-2Butyl cellosolve1A
199928407-37-6C.I. Direct Blue 2181A
19997789-75-5Calcium fluoride1A
1999115-28-6Chlorendic acid1A
199976-15-3Chloropentafluoroethane (CFC-115)1A
199975-72-9Chlorotrifluoromethane1A
19994170-30-3Crotonaldehyde1A
1999108-93-0Cyclohexanol1A
199975-71-8Dichlorodifluoromethane (CFC-12)1A
19991717-00-6Dichlorofluoroethane (HCFC-141)1A
199976-14-2Dichlorotetrafluoroethane (CFC-114)1A
199977-73-6Dicyclopentadiene1A
1999124-40-3Dimethylamine1A
19991300-71-6Dimethylphenol (mixed isomers)1A
1999122-39-4Diphenylamine1A
199928679-13-2Ethoxynonyl benzene1B
19997782-41-4Fluorine1A
199964-18-6Formic acid1A
199941834-16-6HCFC-122 (and all isomers)1A
199934077-87-7HCFC-123 (and all isomers)1A
199963938-10-3HCFC-124 (and all isomers)1A
199970-30-4Hexachlorophene1A
199975-45-6Hydrochlorodifluoromethane (HCFC-22)1A
19997783-06-4Hydrogen sulphide1A
199975-68-3Hydrotrichlorodifluoroethane (HCFC-142B)1A
199913463-40-6Iron pentacarbonyl1A
19994098-71-9Isophorone diisocyanate1A
199978-79-5Isoprene1B
1999554-13-2Lithium carbonate1A
1999110-54-3n-Hexane1A
1999872-50-4n-Methyl pyrrolidone1A
1999924-42-5N-Methylolacrylamide1A
199925154-52-3n-Nonylphenol (mixed isomers)1B
1999104-40-5Nonylphenol1B
199927177-05-5Nonylphenol hepta(oxyethylene) ethanol1B
199927177-08-8Nonylphenol nona(oxyethylene) ethanol1B
19999016-45-9Nonylphenol polyethylene glycol ether1B
199984852-15-3Nonylphenol, industrial1B
199927986-36-3Nonylphenoxy ethanol1B
1999100-01-6p-Nitroaniline1A
199926027-38-3p-Nonylphenol polyethylene glycol ether1B
1999123-63-7Paraldehyde1A
199976-01-7Pentachloroethane1A
19997758-01-2Potassium bromate1A
1999107-19-7Propargyl alcohol1A
19997681-49-4Sodium fluoride1A
19997632-00-0Sodium nitrite1A
19992551-62-4Sulphur hexafluoride1A
199964-75-5Tetracycline hydrochloride1A
199978-00-2Tetraethyl lead1A
199975-69-4Trichlorofluoromethane (CFC-11)1A
1999121-44-8Triethylamine1A
1995*Nitrate ion in solution with a pH of 6.5 or more1A
199478-83-1i-Butyl alcohol1A

 

 


Modifications to Existing Substances

Modifications to NPRI Substance listings over time

Reporting YearCAS NumberOriginal SubstanceNow Listed As
201080-05-7p,p'-IsopropylidenediphenolBisphenol A (name change only)
20071746-01-6Dioxins and furans2,3,7,8-Tetrachlorodibenzo-p-dioxin
200740321-76-4Dioxins and furans1,2,3,7,8-Pentachlorodibenzo-p-dioxin
200739227-28-6Dioxins and furans1,2,3,4,7,8-Hexachlorodibenzo-p-dioxin
200719408-74-3Dioxins and furans1,2,3,7,8,9-Hexachlorodibenzo-p-dioxin
200757653-85-7Dioxins and furans1,2,3,6,7,8-Hexachlorodibenzo-p-dioxin
200735822-46-9Dioxins and furans1,2,3,4,6,7,8-Heptachlorodibenzo-p-dioxin
20073268-87-9Dioxins and furansOctachlorodibenzo-p-dioxin
200751207-31-9Dioxins and furans2,3,7,8-Tetrachlorodibenzofuran
200757117-31-4Dioxins and furans2,3,4,7,8-Pentachlorodibenzofuran
200757117-41-6Dioxins and furans1,2,3,7,8-Pentachlorodibenzofuran
200770648-26-9Dioxins and furans1,2,3,4,7,8-Hexachlorodibenzofuran
200772918-21-9Dioxins and furans1,2,3,7,8,9-Hexachlorodibenzofuran
200757117-44-9Dioxins and furans1,2,3,6,7,8-Hexachlorodibenzofuran
200760851-34-5Dioxins and furans2,3,4,6,7,8-Hexachlorodibenzofuran
200767562-39-4Dioxins and furans1,2,3,4,6,7,8-Heptachlorodibenzofuran
200755673-89-7Dioxins and furans1,2,3,4,7,8,9-Heptachlorodibenzofuran
200739001-02-0Dioxins and furansOctachlorodibenzofuran
2003*4-tert-octylphenolOctylphenol and its ethoxylates (this group contains 6 ethoxylates)
200328679-13-12Ethoxynonyl benzeneNonylphenol and its ethoxylates (this group contains 28 ethoxylates)
2003104-40-5NonylphenolNonylphenol and its ethoxylates (this group contains 28 ethoxylates)
200327177-05-5Nonylphenol hepta (oxyethylene) ethanolNonylphenol and its ethoxylates (this group contains 28 ethoxylates)
200384852-15-3Nonylphenol, industrialNonylphenol and its ethoxylates (this group contains 28 ethoxylates)
200327177-08-8Nonylphenol, nona (oxyethylene) ethanolNonylphenol and its ethoxylates (this group contains 28 ethoxylates)
200325154-52-3n-NonylphenolNonylphenol and its ethoxylates (this group contains 28 ethoxylates)
20039016-45-9Nonylphenol polyethylene glycol etherNonylphenol and its ethoxylates (this group contains 28 ethoxylates)
200326027-38-3p-Nonylphenol polyethylene glycol etherNonylphenol and its ethoxylates (this group contains 28 ethoxylates)
200327986-36-3Nonylphenoxy ethanolNonylphenol and its ethoxylates (this group contains 28 ethoxylates)
2003104-35-82-(p-Nonylphenoxy)ethanolNonylphenol and its ethoxylates (this group contains 28 ethoxylates)
200320427-84-32-(2-(p-Nonylphenoxy)ethoxy)ethanolNonylphenol and its ethoxylates (this group contains 28 ethoxylates)
20037311-27-52-(2-(2-(2-(p-Nonylphenoxy)ethoxy)ethoxy)ethoxy)ethanolNonylphenol and its ethoxylates (this group contains 28 ethoxylates)
200337251-69-7Oxirane, methyl-, polymer with oxirane, mono(nonylphenol)etherNonylphenol and its ethoxylates (this group contains 28 ethoxylates)
2002*Chromium (and its compounds)Chromium (and its compounds, except for hexavalent chromium)
2002*Chromium (and its compounds)Hexavalent chromium compounds
2001108-39-4m-CresolCresol (mixed isomers and their salts)
200195-48-7o-CresolCresol (mixed isomers and their salts)
2001106-44-5p-CresolCresol (mixed isomers and their salts)
20017440-62-2Vanadium (fume or dust)Vanadium (except when in an alloy) and its compounds
1999108-38-3m-XyleneXylene (mixed isomers)
199995-47-6o-XyleneXylene (mixed isomers)
1999106-42-3p-XyleneXylene (mixed isomers)
1996*Nitrate ion in solution at a pH of 6.5 or greaterNitrate ion in solution at a pH of 6.0 or greater
199579-10-7Acrylic acidAcrylic acid (and its salts)
19957664-41-7AmmoniaAmmonia (total)
19956484-52-2Ammonium nitrate (solution)Ammonia (total)
19957783-20-3Ammonium sulphate (solution)Ammonia (total)
19951332-21-4AsbestosAsbestos (friable form)
199562-53-3AnilineAniline (and its salts)
199579-11-8Chloroacetic acidChloroacetic acid (and its salts)
199595-80-72,4-Diaminotoluene2,4-Diaminotoluene (and its salts)
1995120-83-22,4-Dichlorophenol2,4-Dichlorophenol (and its salts)
1995111-42-2DiethanolamineDiethanolamine (and its salts)
1995121-69-7N,N-DimethylanilineN,N-Dimethylaniline (and its salts)
1995534-52-14,6-Dinitro-o-cresol4,6-Dinitro-o-cresol (and its salts)
1995302-01-2HydrazineHydrazine (and its salts)
1995123-31-9HydroquinoneHydroquinone (and its salts)
199590-94-8Michler's ketoneMichler's ketone (and its salts)
1995139-13-9Nitrotriacetic acidNitrotriacetic acid (and its salts)
1995100-02-7p-Nitrophenolp-Nitrophenol (and its salts)
199579-21-0Peracetic acidPeracetic acid (and its salts)
1995108-95-2PhenolPhenol (and its salts)
1995106-50-3p-Phenylenediaminep-Phenylenediamine (and its salts)
199590-43-7o-Phenylphenolo-Phenylphenol (and its salts)
1995110-86-1PyridinePyridine (and its salts)
199591-22-5QuinolineQuinoline (and its salts)
19957440-66-6Zinc (fume or dust)Zinc (and its compounds)

 


Modifications to Reporting Thresholds

Changes to NPRI Substance Reporting Thresholds over time

Reporting YearCAS NumberSubstanceNew Reporting Threshold
2014107-13-1Acrylonitrile1 000 kg
201480-05-7Bisphenol A100 kg
2014302-01-2Hydrazine (and its salts)1 000 kg
201478-79-5Isoprene100 kg
2014*Nonylphenol and its ethoxylates1 000 kg
2014584-84-9Toluene-2,4-diisocyanate100 kg
201491-08-7Toluene-2,6-diisocyanate100 kg
201426471-62-5Toluenediisocyanate (mixed isomers)100 kg
201491-22-5QuinolineMoved to Part 2
2011*Selenium (and its compounds)100kg
2002*Cadmium (and its compounds)5 kg
2002*Arsenic (and its compounds)50 kg
2002*Lead (and its compounds, except tetraethyl lead)50 kg
2002*Tetraethyl lead50 kg
2002*Mercury (and its compounds)5 kg

 


Substances Removed from the NPRI

Substances deleted from the NPRI Substance List over time

Reporting YearCAS NumberSubstance
2014107-05-1Allyl chloride
2014107-04-01-Bromo-2-chloroethane
20143118-97-6C.I. Solvent Orange 7
2014563-47-33-Chloro-2-methyl-1-propene
2014541-41-3Ethyl chloroformate
20102551-62-4Sulphur hexafluoride
20017664-38-2Phosphoric acid
199567-64-1Acetone
1994107-30-2Chloromethyl methyl ether