Aquatic Life Reference Values (ALRVs)

Health Canada's Pest Management Regulatory Agency (PMRA) has established surface water Aquatic Life Reference Values (ALRVs) for pesticides currently registered for use in Canada.

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What are ALRVs

The PMRA has established Aquatic Life Reference Values (ALRVs) for nearly 250 pesticides. ALRVs are pesticide concentrations in surface water below which risks to aquatic life are not expected. PMRA's ALRVs are thresholds for individual pesticides, based on toxicity values for aquatic species, with the goal of protecting the environment. Other federal and provincial departments may also develop thresholds or use other reference values to protect aquatic life. These are developed with different risk management goals in mind using varying methods. As a result, these thresholds may not be equivalent to PMRA's ALRVs.

The PMRA follows internationally accepted methods to assess both long-term (chronic) and short-term (acute) risks to fish and invertebrates. The risk to aquatic vascular and non-vascular plants is also assessed using internationally accepted methods. For a given pesticide, there are up to six ALRVs, depending on the organism group and exposure duration, that form the basis of a pesticide risk assessment:

These values are found in the regulatory decision documents published by PMRA for every pesticide evaluation or re-evaluation; new or updated ALRVs are established upon publication of a final decision. The process for establishing PMRA's ALRVs is similar to that used by the United States Environmental Protection Agency (USEPA) to establish the USEPA Aquatic Life Benchmarks (USEPA ALBs). If PMRA does not have an ALRV, the USEPA ALB is used. Note that there will be a delay between the publication of PMRA final decisions or USEPA ALBs and updates to the ALRV table below.

Short-term (acute) ALRVs

Long-term (chronic) ALRVs

How ALRVs are used

Comparing the measured concentration of a pesticide in water with an ALRV can be helpful in interpreting monitoring data. It can also provide useful information for identifying and prioritizing sites and/or pesticides that may require further investigation.

If concentrations of pesticides in water are below the ALRV, they are not expected to pose risks to freshwater aquatic life. If the concentrations of pesticides in water are equal to or higher than the ALRV, risks to aquatic life may occur, and additional steps may be taken.

Additional actions that PMRA may take when ALRVs are exceeded could include:

ALRV data

The table below lists ALRVs for pesticides that are registered for use in Canada; ALRVs for pesticides that have been cancelled or discontinued are included in the table up to five years after the last date of permissible use. These values are updated annually based on the most recent PMRA decision documents.

The table and footnotes can also be viewed through the downloadable CSV files.

Download table as a CSV

Download footnotes as a CSV

ALRV chemical name ALRV year updated Footnote 1 ALRV Reference Footnote 2 Representative CAS Number Footnote 3 Registered CAS Number(s) Footnote 3 Acute Fish ALRV (µɡ/L) Footnote 4 Chronic Fish ALRV (µɡ/L) Footnote 5 Acute invertebrate ALRV (µɡ/L) Footnote 6 Chronic invertebrate ALRV (µɡ /L) Footnote 7 Non-vascular plants ALRV (µɡ/L) Footnote 8 Vascular plants ALRV (µɡ/L) Footnote 9
1-bromo-3-chloro-5,5-dimethylhydantoin and related hydantoins 2021 EPA Benchmark 16079-88-2 16079-88-2 200   235      
2,4-D 2008 PACR2007-06 94-75-7 94-75-7; 1048373-72-3; 1929-73-3; 1928-43-4 47 120 > 100 15 94 70
2,4-DB 2019 PRVD2018-08 94-82-6 94-82-6; 7720-36-7 3240 1660 64900 1500 550 1300
2-methyl-4-isothiazolin-3-one 2021 EPA Benchmark 2682-20-4 2682-20-4 35 20 90 100 23  
4,5-dichloro-2-N-octyl-3(2H)-isothiazolone 2021 EPA Benchmark 64359-81-5 64359-81-5 0.7 0.42 2.6 0.4 18 166
4-nitro-3-(trifluoromethyl)phenol or sodium salt 2019 EPA Benchmark 88-30-2 88-30-2 300 1790 1900   1200 > 9770
Abamectin 2014 EPA Benchmark 71751-41-2 71751-41-2 1.6 0.52 0.17   > 100000 3900
Acephate 2020 PRVD2019-04; PRVD2016-01 30560-19-1 30560-19-1 11000 100000 650 150 24000  
Acequinocyl 2007 ERC2007-10 57960-19-7 57960-19-7 > 110 1100 2.55 0.98 > 34300 > 11500
Acetamiprid 2010 PRD2010-02 135410-20-7 135410-20-7 < 11800 19200 12 5000 1100 1000
Acibenzolar-S-methyl 2011 PRD2010-19 135158-54-2 135158-54-2 88 26 1450 48 1655 156
Acifluorfen 2016 EPA Benchmark 62476-59-9 62476-59-9 8500 < 3400 14050   > 355 378
Acrolein 2016 EPA Benchmark 107-02-8 107-02-8 7 11.4 < 15.5 7.1 28 72
Afidopyropen 2018 PRD2018-15 915972-17-7 915972-17-7 0.96 297 45 0.123 157 4370
Ametoctradin 2012 PRD2011-25 865318-97-4 865318-97-4 > 6.46 48 > 77.5 242 3.9 66
Aminocyclopyrachlor 2014 PRD2014-08 858956-08-8 858956-08-8 > 120000 11000 > 19850 4900 > 3260 42350
Aminopyralid 2007 REG2007-01 150114-71-9 150114-71-9 100000 1360 98600 33000 6000 44000
Amitrole 2014 PRVD2012-01 61-82-5 61-82-5 > 100000 100000 9000 200 1150 1250
Atrazine 2016 EPA Benchmark 1912-24-9 1912-24-9 2650 5 360 60 < 1 4.6
Azamethiphos 2017 PRD2016-25 35575-96-1 35575-96-1 20       500  
Azoxystrobin 2007 REG2007-02 131860-33-8 131860-33-8 68 147 126 44 20 800
Bensulide 2016 EPA Benchmark 741-58-2 741-58-2 550 169 290 11 780 140
Bentazon 2016 EPA Benchmark 25057-89-0 25057-89-0; 50723-80-3 > 95000 9830 31150 101200 4500 5350
Benzovindiflupyr 2015 PRD2015-07 1072957-71-1 1072957-71-1 0.35 0.95 42.5 5.6 > 445 > 440
Beta-cyfluthrin 2021 EPA Benchmark 68359-37-5 68359-37-5 0.034 0.0042 0.145 0.003    
Bicyclopyrone 2015 PRD2015-02 352010-68-5 352010-68-5 > 9340 > 1860 > 9500 103700 1000 6.5
Bifenazate 2006 REG2006-01 149877-41-8 149877-41-8 160   50 150 252 3820
Bifenthrin 2017 PRD2017-11 82657-04-3 82657-04-3 0.078 0.04 0.009 0.0013 > 3150 > 330
Bispyribac-sodium 2015 EPA Benchmark 125401-92-5 125401-92-5 > 51000 9200 > 49600   250 12
Bixafen 2019 PRD2019-04 581809-46-3 581809-46-3 7.4 4.6 550 15.6 34.3 > 205
Boric acid 2019 EPA Benchmark 10043-35-3 10043-35-3 202000 42000 130000 8900 81300 163000
Boscalid 2009 REG2004-02 188425-85-6 188425-85-6 1900 140 1600 1300 140 500
Broflanilide 2020 PRD2020-06 1207727-04-5 1207727-04-5 25.1 51 > 166 5.93 > 200 > 317
Bromacil   EPA Benchmark 314-40-9 314-40-9 18000 3000 60500 8200 6.8 45
Bromoxynil 2016 EPA Benchmark 1689-99-2 56634-95-8;1689-99-2 14.5 18 5.5 2.5 51 219
Captan 2018 PRVD2016-13 133-06-2 133-06-2 26.8 16.5 4200 560 100 6350
Carbaryl 2009 PRVD2009-14 63-25-2 63-25-2 25 210 1.8 1.5 635 1550
Carbathiin / carboxin 2022 EPA Benchmark 5234-68-4 5234-68-4 600   42200   370 670
Carbendazim 2020 RVD2020-13; PRVD2019-07; PRVD2011-07 10605-21-7 10605-21-7 13 0.4 75 1.5 470 > 2400
Carfentrazone-ethyl 2012 PRD2011-08 128639-02-1 128639-02-1 800 16 > 4900 220 3.3 3
Chlorantraniliprole 2016 ERC2008-03 500008-45-7 500008-45-7 13800 110 5.8 2.5 2090 1990
Chlorfenapyr 2016 EPA Benchmark 122453-73-0 122453-73-0 3.72 3.68 2.915 3.57    
Chlorimuron-ethyl 2019 PRVD2018-14 90982-32-4 90982-32-4 > 1000 8200 > 50000 106000 0.4 0.135
Chlormequat chloride 2022 EPA Benchmark 999-81-5 999-81-5 > 50000 10000 8450 5000 > 207000 2600
Chloropicrin 2014 EPA Benchmark 76-06-2 76-06-2 5.5   60     6.5
Chlorothalonil 2018 PRVD2011-14 1897-45-6 1897-45-6 13 3 19 39 5 640
Chlorpropham 2008 PACR2007-04 101-21-3 101-21-3 550   1300   835  
Chlorpyrifos 2020 PRVD2019-05 2921-88-2 2921-88-2 5.94 0.14 0.044 0.005 32 1000
Chlorsulfuron 2014 EPA Benchmark 64902-72-3 64902-72-3 > 150000 32000 > 185000 20000 50 0.35
Chlorthal-dimethyl (DCPA) 2016 EPA Benchmark 1861-32-1 1861-32-1 15000   13500   > 11000 > 11000
Clethodim 2017 PRVD2016-11 99129-21-2 99129-21-2 340 10 2550 0.84 750 670
Clodinafop propargyl 2020 PRVD2018-16 105512-06-9 105512-06-9 21 14 25 230 20 > 2250
Clofentezine 2014 PRVD2013-05 74115-24-5 74115-24-5 > 1000 980 > 25650 500 10000  
Clomazone   EPA Benchmark 81777-89-1 81777-89-1 1450 350 2700 2200 167 30200
Clopyralid 2011 PRVD2010-17 1702-17-6 1702-17-6 > 9990 10800 116000 17000 3450 44500
Cloransulam-methyl 2008 PRD2008-09 147150-35-4 147150-35-4 > 86000   63300 11300 0.9 0.78
Clothianidin 2021 ERC2011-01; SRD2021-03 210880-92-5 210880-92-5 > 10150 9700 1.5 0.12 32000 > 60500
Copper 8-quinolinolate 2022 EPA Benchmark 10380-28-6 10380-28-6 4.45 2.99 81   2.2 > 50
Cyantraniliprole 2013 PRD2013-09 736994-63-1 736994-63-1 > 1000 10700 10.2 6.5 7000 > 6050
Cyazofamid 2017 PRD2016-34 120116-88-3 120116-88-3 107 90.1 95 107 19 107
Cyclaniliprole 2017 PRD2017-12 1031756-98-5 1031756-98-5 > 63 212 > 26.7 10 > 76 > 97.5
Cyflumetofen 2014 PRD2014-10 400882-07-7 400882-07-7 > 1.75 31.6 > 8.6 16.2 > 11.9 > 19.15
Cyfluthrin 2021 EPA Benchmark 68359-37-5 68359-37-5 0.034 0.0042 0.0125 0.00012 > 2  
Cymoxanil 2000 REG2000-05 57966-95-7 57966-95-7 17000 < 31 15000 67 62.5 700
Cypermethrin 2018 PRVD2016-18 52315-07-8 52315-07-8 0.33 0.14 0.003 0.04 > 50 > 0.7
Cyprodinil 2019 EPA Benchmark 121552-61-2 121552-61-2 1090 230 16 8.2 1970 5900
Cyromazine 2021 PRVD2020-02 66215-27-8 66215-27-8 71500 14000 34470 25 62000  
DEET 2015 EPA Benchmark 134-62-3 134-62-3 37500   37500      
Deltamethrin 2018 PRVD2015-07 52918-63-5 52918-63-5 0.22 < 0.032 0.0036 0.0041 > 310 > 779
Diazinon 2005 REV2005-06; EPA Benchmark 333-41-5 333-41-5 9 < 0.47 0.415 0.32 3700  
Dicamba 2008 PRVD2007-05 1918-00-9 1918-00-9 13540   55350   4.9 250
Dichlobenil 2016 EPA Benchmark 1194-65-6 1194-65-6 2465 < 330 3100 560 1500 30
Dichlorprop-p 2014 PRD2013-15 15165-67-0 15165-67-0 > 21600   > 44000 103000 10000 16000
Dichlorvos (DDVP) 2020 PRVD2017-16; EPA Benchmark 62-73-7 62-73-7 17 5.2 0.035 0.0058 14000 60600
Difenoconazole 2016 PRD2015-10 119446-68-3 119446-68-3 8.1 8.7 192.5 5.6 25 450
Diflubenzuron   EPA Benchmark 35367-38-5 35367-38-5 12900 100 0.0014 0.00025 200 190
Diflufenzopyr 2018 PRVD2017-04 109293-97-2 109293-97-2 10600   7500   50 > 175
Dimethenamid-P 2009 PRD2009-04 163515-14-8 163515-14-8 630 300 6000 1020 8.5 4.5
Dimethoate 2015 PRVD2011-12; EPA Benchmark 60-51-5 60-51-5 600 430 21.5 40 20000 > 92600
Dimethomorph 2020 RVD2020-05; PRVD2019-03 110488-70-5 110488-70-5 340 56 10000 100 11900 11020
Dinotefuran 2016 EPA Benchmark 165252-70-0 165252-70-0 > 49550 6360 > 484150 > 95300 > 97600 > 110000
Diquat   EPA Benchmark 85-00-7 85-00-7 7400 122 385 < 36 9.4 0.75
Dithiopyr 2009 PRVD2009-01; EPA Benchmark 97883-45-8 97883-45-8 48 56 550 81 21 6.11
Diuron 2021 EPA Benchmark 330-54-1 330-54-1 660 26.4 87.5 0.83 3.08 0.13
Dodine 2022 EPA Benchmark 2439-10-3 2439-10-3 285 99 8.9 4.4 0.08 30
Endothal 2021 EPA Benchmark 145-73-3 145-73-3 24500 1300 46000 1500    
EPTC / S-ethyl dipropylthiocarbamate 2008 PRVD2007-03; EPA Benchmark 759-94-4 759-94-4 1400 40 7000 800 680 2800
Ethaboxam 2014 PRD2014-13 162650-77-3 162650-77-3 218 880 185 50 160 > 13000
Ethalfluralin 2016 EPA Benchmark 55283-68-6 55283-68-6 16 0.4 30 24 25 7.3
Ethametsulfuron methyl 2008 PRVD2008-05 97780-06-8 97780-06-8 > 60000   > 17000 15000 > 1300 0.025
Ethephon 2019 EPA Benchmark 16672-87-0 16672-87-0 44000 43000 15850 17000 23500 2500
Ethofumesate 2021 EPA Benchmark 26225-79-6 26225-79-6 5760 < 306 17150 300 > 2760 39000
Etofenprox   EPA Benchmark 80844-07-01 80844-07-01 1.35 23 0.4 0.17 > 18.8 > 26
Etridiazole 2022 EPA Benchmark 2593-15-9 2593-15-9 385 101 1540 370 72 8120
Famoxadone 2003 REG2003-10 131807-57-3 131807-57-3 1.2 1.4 5.9 0.085 11.5 40.5
Fenamidone 2003 REG2003-11; EPA Benchmark 161326-34-7 161326-34-7 350 4.7 110 12.5 > 365 > 440
Fenbuconazole 2006 PRDD2005-03 114369-43-6 114369-43-6 420 82 780 78 270 740
Fenbutatin oxide   EPA Benchmark 13356-08-6 13356-08-6 0.85 0.31 15.5 16    
Fenhexamid 2021 PRVD2020-01 126833-17-8 126833-17-8 123 101 > 9400 1000 670 > 500
Fenoxaprop-P-ethyl 2016 EPA Benchmark 71283-80-2 71283-80-2 230 44 > 550 230 430 > 3000
Fenpropathrin 2020 PRD2020-05 39515-41-8 39515-41-8 0.22 0.091 0.0039 0.027 > 295 > 500
Ferbam 2018 PRVD2016-05 14484-64-1 14484-64-1 4.2 0.32 5.5 1 70 800
Flazasulfuron 2018 PRD2018-03 10404-78-0 10404-78-0 > 9800 5000 > 53000 6390 2.05 0.02
Flonicamid 2011 PRD2010-25 158062-67-0 158062-67-0 > 9800 9500 > 49300 3010 > 48350 > 59500
Florasulam 2005 PRDD2004-04 145701-23-1 145701-23-1 100000 119000 174000 38900 1.75 0.62
Fluazifop-P-butyl 2015 EPA Benchmark 79241-46-6 79241-46-6 225 203 2570      
Fluazinam 2018 PRD2017-14 79622-59-6 79622-59-6 3.6 0.69 110 68 75 > 26.8
Flucarbazone 2009 REG2000-09; PRD2008-13 181274-17-9 181274-17-9 96700 2750 25100 114640 2500 5300000
Fludioxonil 2006 REG2006-08 131341-86-1 131341-86-1 66 19 90 19 30 630
Fluensulfone 2017 PRD2017-02 318290-98-1 318290-98-1 250 630 190 200 7.5 1350
Flufenacet 2003 RDD2003-07 142459-58-3 142459-58-3 230 179 1400 6330 1.45 1.225
Flumetsulam 2014 PRVD2014-05 98967-40-9 98967-40-9 > 29300 197000 295000 200000 2.5 2.5
Flumioxazin 2014 ERC2010-05; PRD2013-20 103361-09-7 103361-09-7 230 7.7 2950 50 0.415 0.165
Fluopicolide 2011 ERC2011-08 239110-15-7 239110-15-7 40 150 > 850 190 > 220 > 320
Fluopyram 2014 ERC2014-02 658066-35-4 658066-35-4 > 178 135 > 8500 1214 1700 1300
Fluoxastrobin 2016 PRD2012-07 361377-29-9 361377-29-9 43.5 55.7 60 180 130 600
Flupyradifurone 2014 PRD2014-20 951659-40-8 951659-40-8 > 7050 4410 32 10.5 > 21400 > 33850
Fluroxypyr 2012 PRD2012-18 81406-37-3 81406-37-3 > 20 200 > 100 60.5 18.5 > 1155
Flutianil 2019 EPA Benchmark 958647-10-4 958647-10-4 > 395 2.24 > 475 7.1 120 > 214
Flutriafol 2015 PRD2014-16 76674-21-0 76674-21-0 92 390 415 13 285 325
Fluxapyroxad 2012 PRD2012-09 907204-31-3 907204-31-3 0.45 36 4.15 460 185 1095
Folpet 2020 PRVD2018-05 133-07-3 133-07-3 1.5 8.81 10 1880 20.1 > 1450
Fomesafen 2018 PRVD2018-15; EPA Benchmark 72178-02-0 72178-02-0 17000 9400 165000 50000 46 105
Foramsulfuron 2008 REG2003-08; PRD2008-05; EPA Benchmark 173159-57-4 173159-57-4 100900 10500 102500 102500 330 0.33
Formetanate hydrochloride 2009 PRVD2008-26; EPA Benchmark 23422-53-9 23422-53-9 270 480 45 0.5 156.3 6928
Fosetyl-Al 2019 PRVD2017-19 39148-24-8 39148-24-8 8300 213 1800 17000 2750 40000
Glufosinate-ammonium 2014 EPA Benchmark 77182-82-2 77182-82-2 > 156000 50000 325500 31000 72 1470
Glyphosate 2017 PRVD2015-01 1071-83-6 1071-83-6 80400 25700 16900 7140 6550 10600
Halauxifen-methyl 2014 PRD2014-12 943831-98-9 943831-98-9 201 77 1060 484 280.4 0.0745
Halosulfuron-methyl 2014 PRD2014-05 100784-20-1 100784-20-1 > 11800 34000 > 53500 7200 2.65 0.019
Hexazinone 2019 EPA Benchmark 51235-04-2 51235-04-2 137000 17000 75800 20000 7 37.4
Icaridin 2015 EPA Benchmark 119515-38-7 119515-38-7 86500   > 51500   87300  
Imazamethabenz-methyl 2009 PRVD2008-29 81405-85-8 81405-85-8 > 840 < 320 > 50000 8500 13450 36.4
Imazamox 2015 EPA Benchmark 114311-32-9 114311-32-9 > 59500   > 61000   > 37 8
Imazapyr 2011 PRD2011-12; EPA Benchmark 81334-34-1 81334-34-1 > 139 43100 > 695 97100 > 695 12
Imazethapyr 2010 PRVD2010-02 81335-77-5 81335-77-5 34000 14000 > 500000 103000 35000 5.05
Imidacloprid 2021 PRVD2016-20; RVD2021-05 138261-41-3 138261-41-3 1780 1200 0.54 0.16 6185 > 52500
Indaziflam 2011 PRD2011-20 950782-86-2 950782-86-2 32 465.3 > 90 340 30.4 0.03405
Inpyrfluxam 2020 PRD2020-10 1352994-67-2 1352994-67-2 3.1 1.6 550 140 1965 2850
Iodocarb 2017 PRVD2016-25 55406-53-6 55406-53-6 6.7   80      
Iodosulfuron-methyl-sodium 2009 PRD2008-06; EPA Benchmark 144550-36-7 144550-36-7 88000 10200 28100 9100 14 390
Ipconazole 2013 ERC2011-04; EPA Benchmark 125225-28-7 125225-28-7 130 0.18 850 10.9 650 350
Iprodione 2018 PRVD2016-09 36734-19-7 36734-19-7 310 260 120 170 24 6320
Isofetamid 2016 PRD2014-19 875915-78-9 875915-78-9 22.7 860 1175 800 1075 1225
Isoxaben 2015 EPA Benchmark 82558-50-7 82558-50-7 > 500 400 > 650 690 922 10
Isoxaflutole 2022 PRVD2021-02 141112-29-0 141112-29-0 170 100 > 750 350 60 1.6
Kresoxim-methyl 2003 PRDD2003-05; EPA Benchmark 143390-89-0 143390-89-0 95 87 166 55 12 288
Lambda-cyhalothrin 2021 RVD2021-04; EPA Benchmark 91465-08-6 91465-08-6 0.113 0.031 0.00094 0.00198 2.5 > 0.508
Linuron 2020 PRVD2012-02; RVD2020-10 330-55-2 330-55-2 315 42 60 130 7 10.5
Malathion 2012 PRVD2010-18; EPA Benchmark 121-75-5 121-75-5 7.5 2 0.13 0.06 2040 24000
Maleic hydrazide 2015 EPA Benchmark 123-33-1 123-33-1 > 120000 9600 53750 99000 > 95000 114000
Mancozeb 2020 RVD2020-12 8018-01-7 8018-01-7 20 1.35 31.5 7.3 1.5 521
Mandestrobin 2016 PRD2016-03 173662-97-0 173662-97-0 93 150 600 560 32.5 1150
Mandipropamid 2009 ERC2009-01 374726-62-2 374726-62-2 400 480 3550 280 > 1250 > 2200
MCPA 2008 PACR2006-05 94-74-6 94-74-6 9600   31000   4700 13
MCPB 2012 PRVD2011-06 94-81-5 94-81-5; 6062-26-6 390   25000   190 105
Mecoprop-P (MCPP-P) 2016 EPA Benchmark 16484-77-8 16484-77-8 > 46500   > 45500 50800 14 1300
Mefentrifluconazole 2019 PRD2019-09 1417782-03-6 1417782-03-6 53.6 22.2 > 90 9.13 383 > 937
Mesosulfuron-methyl 2010 PRD2010-01; EPA Benchmark 208465-21-8 208465-21-8 > 9150 29600 > 45100 1700 105 0.32
Mesotrione 2005 REG2005-02 104206-82-8 104206-82-8 > 12000 12500 450000 180000 2250 2
Metalaxyl 2019 EPA Benchmark 57837-19-1 57837-19-1; 70630-17-0 65000 9100 14000 1200   85000
Metaldehyde 2021 EPA Benchmark 108-62-3 108-62-3 37500 37500 > 38800 73900 22100 > 105000
Metconazole 2011 ERC2011-02 125116-23-6 125116-23-6 220 2.9 2100 160 48.5 12.5
Methomyl 2018 PRVD2016-02 16752-77-5 16752-77-5 347 57 15 0.4    
Methoxyfenozide 2004 REG2004-08; EPA Benchmark 161050-58-4 161050-58-4 3300 530 1700 6.5 > 3400  
Methyl bromide 2014 EPA Benchmark 74-83-9 74-83-9 1950   1300   2200  
Metiram 2018 PRVD2014-03 9006-42-2 9006-42-2 760   385 25 27  
Metolachlor (S and R enantiomer) 2022 EPA Benchmark 87392-12-9 87392-12-9 1600 30 11750 3200 8 14
Metrafenone 2011 ERC2011-10 220899-03-6 220899-03-6 82 118 460 716 430 380
Metribuzin 2016 EPA Benchmark 21087-64-9 21087-64-9 21000 < 3000 2100 1290 8.1 130
Metsulfuron methyl 2008 PRVD2008-08 74223-64-6 74223-64-6 > 11300 > 79400 > 57500 100000 46.95 0.035
MGK-264 (N-octyl bicycloheptene dicarboximide) 2017 PRVD2017-15; EPA Benchmark 113-48-4 113-48-4 140 8 1150 20 8  
Myclobutanil 2010 PRVD2010-14 88671-89-0 88671-89-0 140 200 5500 1000 600 3150
Naled 2022 PSRD2019-03; SRD2022-01; EPA Benchmark 300-76-5 300-76-5 8.87 6.9 0.175 0.098 6 > 1800
Naphthalene acetic acid 2021 EPA Benchmark 86-87-3 86-87-3 14000 1200 90000 11000 6100 4200
Napropamide 2021 EPA Benchmark 15299-99-7 15299-99-7 6000 1100 12350 1100 2020 350
Niclosamide 2019 EPA Benchmark 50-65-7 50-65-7 15   17 56 41 630
Nicosulfuron 2008 PRVD2008-01 111991-09-4 111991-09-4 37.5 24000 45000 43000 1660 140
Novaluron 2007 PRD2006-05 116714-46-6 116714-46-6 > 95 6.5 0.2 0.0299 > 4925 > 35.35
Oxadiazon 2021 EPA Benchmark 19666-30-9 19666-30-9 600 0.88 > 1200 30 5.2 41
Oxamyl 2008 PRVD2007-02; EPA Benchmark 23135-22-0 23135-22-0 370 > 500 90 27 120 30000
Oxathiapiprolin 2015 PRD2015-22 1003318-67-9 1003318-67-9 69 460 > 280 750 > 71 > 395
Oxyfluorfen 2022 EPA Benchmark 42874-03-3 42874-03-3 100 1.3 750 13 1.1 0.33
Paraquat   EPA Benchmark 4685-14-7 4685-14-7 6000 < 369 600 < 36.9 0.396 71
Pendimethalin 2019 EPA Benchmark 40487-42-1 40487-42-1 69 6.3 140 14.5 5.2 12.5
Penflufen 2012 PRD2012-02 494793-67-8 494793-67-8 9 24.3 > 2250 780 > 2550 > 2350
Pentachlorophenol (PCP)   EPA Benchmark 87-86-5 87-86-5 47.5   25      
Penthiopyrad 2012 PRD2011-26 183675-82-3 183675-82-3 29 100 1265.5 471 766.5 > 603
Permethrin 2019 PRVD2017-18 52645-53-1 52645-53-1 1.2 0.3 0.019 0.0047 6.25 > 3.2
Pethoxamid 2020 PRD2019-12 106700-29-2 106700-29-2 195 722 6850 2800 0.85 1.73
Phenmedipham 2020 EPA Benchmark 13684-63-4 13684-63-4 850 93 940 5.06 149 160
Phorate 2021 EPA Benchmark 298-02-2 298-02-2 1.17 0.34 0.3 0.21 1300 9000
Phosmet 2020 RVD2020-11; EPA Benchmark 732-11-6 732-11-6 9.85 3.2 1 0.75 255 > 1800
Picarbutrazox 2021 EPA Benchmark 500207-04-5 500207-04-5 > 145 76 > 140 130 > 271 > 314
Picloram 2015 2015 EPA Benchmark 1918-02-1 1918-02-1 2750 550 17200 11800 34900  
Picolinafen 2005 PRDD2005-05 137641-05-5 137641-05-5 570 6.4 450 7.06 0.068 6
Picoxystrobin 2012 PRD2012-10 117428-22-5 117428-22-5 44.7 10 16 8 16.4 115
Pinoxaden 2006 REG2006-14; EPA Benchmark 243973-20-8 243973-20-8 16000 > 960 3000 5800 130 2900
Piperonyl butoxide 2020 PRVD2020-09 51-03-6 51-03-6 190 40 255 19 1050 6630
Poly[oxyethylene(dimethyliminio)ethylene(dimethyliminio)ethylene dichloride 2021 EPA Benchmark 31512-74-0 31512-74-0 23.5 19 140 15 83 1100
Prohexadione-calcium 2014 EPA Benchmark 127277-53-6 127277-53-6 > 47300   > 50000 12500 > 1100 > 1200
Prometryn 2014 EPA Benchmark 7287-19-6 7287-19-6 1455 620 4850 1000 1.04 11.9
Propamocarb hydrochloride 2019 EPA Benchmark 25606-41-1 25606-41-1 > 49500 6300 > 51700 9300 > 170000 172000
Propiconazole 2011 PRVD2011-02 60207-90-1 60207-90-1 85 95 1100 310 46.5 2414
Propoxur 2011 PRVD2011-09 114-26-1 114-26-1 370   5.5      
Propoxycarbazone-sodium 2016 PRD2016-06 181274-15-7 181274-15-7 > 7720 > 105000 > 53500 > 106000 785 3.2
Propyzamide 2016 EPA Benchmark 23950-58-5 23950-58-5 5300 224 > 2800 600 760 1180
Prosulfuron 2015 PRVD2015-02 94125-34-5 94125-34-5 > 10000 5800 > 60000 148000 5.3 0.63
Prothioconazole 2012 REG2007-03; EPA Benchmark 178928-70-6 178928-70-6 910 163 930 230 12.17 3.34
Pydiflumetofen 2018 PRVD2018-06 1228284-64-7 1228284-64-7 18.6 64 210.5 42 750 > 3150
Pymetrozine 2002 PRDD2002-03 123312-89-0 123312-89-0 128000 11700 < 19200 25.1 6800 > 109000
Pyraclostrobin 2008 PRD2008-04 175013-18-0 175013-18-0 0.62 2.35 7.85 4 0.75 860
Pyraflufen-ethyl 2014 ERC2014-03 129630-19-9 129630-19-9 8.6 0.89 10 81 0.16 1.3
Pyrasulfotole 2007 ERC2007-11 365400-11-9 365400-11-9 > 9600 580 > 47900 12800 5500 14
Pyrethrins 2020 PRVD2020-08 8003-34-7 8003-34-7 0.51 1.9 5.8 0.86 > 23 615
Pyridaben 2018 PRVD2016-04 96489-71-3 96489-71-3 0.073 0.28 0.265 0.044 > 6.7 > 8.1
Pyridate 2021 EPA Benchmark 55512-33-9 55512-33-9 > 190 192 10.5 28 26.8 > 1500
Pyrimethanil 2006 REG2006-04 53112-28-0 53112-28-0 4000 77 1500 970 120 870
Pyriofenone 2016 PRD2016-23 688046-61-9 688046-61-9 > 115 400 775 89 31 > 787
Pyriproxyfen 2019 PRVD2019-10; PRDD2006-04; EPA Benchmark 95737-68-1 95737-68-1 45 4.3 200 0.02 56 > 0.18
Pyroxasulfone 2016 PRD2012-20 447399-55-5 447399-55-5 > 220 2000 > 2200 1900 0.1585 2.5
Pyroxsulam 2010 ERC2010-04 422556-08-9 422556-08-9 > 8700 10100 > 50000 10400 56 1.29
Quinclorac 2016 PRVD2016-15 84087-01-4 84087-01-4 > 10000 16000 56600 110000 > 250000 > 250000
Quinoxyfen 2013 ERC2013-02 124495-18-7 124495-18-7 27 13 41.5 27.8 13.4 > 830
Quintozene (PCNB)   EPA Benchmark 82-68-8 82-68-8 50 13 385 18    
Quizalofop-P-ethyl 2015 EPA Benchmark 100646-51-3 100646-51-3 360 10 175 26600 41000 34.5
Rimsulfuron 2008 PRVD2008-06 122931-48-0 122931-48-0 > 10000 125000 > 50000 820 600 2.3
Rotenone 2022 EPA Benchmark 83-79-4 83-79-4 0.97 1.01 1.85 1.25    
Saflufenacil 2010 PRD2009-18 372137-35-4 372137-35-4 > 11000 1000 > 49000 650 21 44
Sedaxane 2012 ERC2012-01 874967-67-6 874967-67-6 62 165 2980 750 800 1350
Sethoxydim 2015 EPA Benchmark 74051-80-2 74051-80-2 85000 4860 39050   > 250 210
Simazine 2016 EPA Benchmark 122-34-9 122-34-9 3200 60 500 40 6 67
S-Methoprene 2016 EPA Benchmark 40596-69-8 40596-69-8 380 48 165 51    
Spinetoram 2013 PRD2012-31 187166-40-1 187166-40-1; 187166-15-0 269 186 1700 0.062 65 7100
Spinosad 2001 REG2001-10 168316-95-8 168316-95-8; 131929-60-7; 131929-63-0 2100 500 300 0.62 49 1860
Spirodiclofen 2006 REG2006-06 148477-71-8 148477-71-8 35.1 1.95 50.8 11.1 60 63.8
Spiromesifen 2007 ERC2007-08 283594-90-1 283594-90-1 1.68 1.5 > 46.15 0.25 > 22.2 > 50.7
Spirotetramat 2008 PRD2008-07 203313-25-1 203313-25-1 220 534 650 100 2025 2245
Spiroxamine 2015 PRD2015-14 118134-30-8 118134-30-8 241 2.6 1500 34 0.18 955
Streptomycin 2020 EPA Benchmark 3810-74-0 3810-74-0 > 90000 14400 21000 12200 7 > 1000
Sulfentrazone 2011 ERC2010-08 122836-35-5 122836-35-5 9380 2950 30200 51 15.5 14.5
Sulfoxaflor 2015 PRD2015-08 946578-00-3 946578-00-3 > 36300 630 > 199500 45.5 33050 > 50000
TCMTB [2-(thiocyanomethylthio) benzothiazole] 2017 PRVD2016-23 21564-17-0 21564-17-0 0.87 0.34 11 0.89 50 140
Tebuconazole 2017 PRD2016-33 107534-96-3 107534-96-3 570 12 740 120 820 72
Tebufenozide 2021 PRVD2019-06; RVD2021-01 112410-23-8 112410-23-8 300 > 710 150 9.7 > 370 80
Tefluthrin 2010 PRVD2010-01 79538-32-2 79538-32-2 0.006 0.00397 0.035 0.792 > 525  
Tembotrione 2012 ERC2012-02 335104-84-2 335104-84-2 > 10000 604 24450 2000 155 > 2.6
Tepraloxydim 2004 PRDD2004-01 149979-41-9 149979-41-9 44800       10200 1110
Terbacil 2022 EPA Benchmark 5902-51-2 5902-51-2 23100 1200 32500 50 11 140
Tetraconazole 2019 PRD2012-29 112281-77-3 112281-77-3 385 300 1320 190 135 160
Tetramethrin 2018 PRVD2016-10 7696-12-0 7696-12-0 0.37   17.5      
Tetraniliprole 2020 PRD2019-14 1229654-66-3 1229654-66-3 > 1090 646 > 15 0.704 > 1690 > 5650
Thiabendazole 2020 EPA Benchmark 148-79-8 148-79-8 280 110 155 42 1420 2320
Thiacloprid 2007 PRD2007-02 111988-49-9 111988-49-9 2520 780 20.4 0.68 23000 > 47700
Thiamethoxam 2021 ERC2007-01; SRD2021-04 153719-23-4 153719-23-4 100000 20000 9 0.3 100000 90200
Thiencarbazone-methyl 2011 ERC2010-03 317815-83-1 317815-83-1 > 10400 4800 > 49300 3540 85 0.17
Thifensulfuron methyl 2008 PRVD2008-03 79277-27-3 79277-27-3 > 10000 250000 235000 100000 8.15 0.5
Thiophanate-methyl 2020 PRVD2019-07 23564-05-8 23564-05-8 830 320 2700 160 470 > 2350
Thiram 2016 PRVD2016-07 137-26-8 137-26-8 4.2 0.32 5.5 1 70 800
Tiafenacil 2021 EPA Benchmark 1220411-29-9 1220411-29-9 > 37800 16 > 37750 605 5 6
Tioxazafen 2018 PRD2017-10 330459-31-9 330459-31-9 9.11 9.4 > 600 5.9 62.65 > 477
Tolpyralate 2017 PRD2017-13 1101132-67-5 1101132-67-5 > 1980 33.2 > 9750 8960 2720 2.945
Topramezone 2006 REG2006-09 210631-68-8 210631-68-8 97400 2930 100000 48600 3000 1
Tralkoxydim 2011 PRVD2009-08 87820-88-0 87820-88-0 > 720   1360 2100 > 2550 500
Triallate 2008 PRVD2007-08 2303-17-5 2303-17-5 69.8 38 45.5 13 12.5 2400
Tribenuron methyl 2016 EPA Benchmark 101200-48-0 101200-48-0 > 50000 11800 360000 < 28000 22 2
Triclopyr 2022 EPA Benchmark 55335-06-3 64700-56-7; 55335-06-3 180 26 175 170 100 880
Trifloxystrobin 2009 REG2004-03 141517-21-7 141517-21-7 7.2 4.3 1.5 2.76 2 410
Trifludimoxazin 2021 EPA Benchmark 1258836-72-4 1258836-72-4 > 294 12 > 975 10.07 0.2 0.115
Trifluralin 2016 EPA Benchmark 1582-09-8 1582-09-8 9.25 1.9 125.5 2.4 21.9 49.7
Triflusulfuron-methyl 2015 PRVD2014-06 126535-15-7 126535-15-7 21000       33.75 2.03
Triforine 2019 PRVD2019-02 26644-46-2 26644-46-2 > 1250   4475 1670 189800 > 2900
Trinexapac-ethyl 2020 PRD2020-13 95266-40-3 95266-40-3 3500 410 29000 2400 175 95
Triticonazole 2005 PRDD2004-06; EPA Benchmark 131983-72-7 131983-72-7 > 360 21 4500 1300 350 1400
Ziram 2018 PRVD2016-06 137-30-4 137-30-4 0.97 < 0.32 24 1 33.5 370
Zoxamide 2001 REG2001-09 156052-68-5 156052-68-5 51 3.48 780 39 4.1 9

ALRV table information

Empty cells indicate that acceptable aquatic toxicity values are not available.

ALRVs preceded by ">" were derived from a "greater-than" value and may overestimate toxicity. ALRVs preceded by "<" were derived from a "less-than" value and may underestimate toxicity.

Footnotes

Footnote 1

ALRV Year Updated refers to the year of publication of the final decision for the assessment upon which the latest ALRV was based.

Return to footnote 1 referrer

Footnote 2

ALRV Reference refers to the published document that contains the toxicity values used to derive the ALRV. Where the ALRV reference indicates "EPA Benchmark", no ALRV was available and the EPA Aquatic Life Benchmark was used.

Return to footnote 2 referrer

Footnote 3

CAS numbers:

  • Representative CAS number is a single CAS number associated with the active that has been selected to represent the active for the purposes of data analysis (for example, comparison against water monitoring data available on the Open Government Portal).
  • Registered CAS number(s) includes CAS numbers of chemical forms associated with the active as it is currently registered; may include multiple CAS numbers.

Return to footnote 3 referrer

Footnote 4

Acute Fish ALRV = Toxicity value x UF. UF = 0.1 for LC50 and EC50 values; no UF is applied to NOEC and HC5 values. The selected toxicity value is usually the lowest acute endpoint in a standardized test; examples of test species are Rainbow Trout (Oncorhynchus mykiss), Fathead Minnow (Pimephales promelas), and Bluegill Sunfish (Lepomis macrochirus). NOECs for acute fish endpoints are based on old methods and are updated as actives go through assessments using new methodology.

Return to footnote 4 referrer

Footnote 5

Chronic Fish ALRV = Toxicity value. UFs are not applied to chronic toxicity values. The selected toxicity value is usually the lowest NOEC or NOEL from a life-cycle or early life stage test; examples of test species are Rainbow Trout (Oncorhynchus mykiss), Fathead Minnow (Pimephales promelas), and Bluegill Sunfish (Lepomis macrochirus).

Return to footnote 5 referrer

Footnote 6

Acute Invertebrate ALRV = Toxicity value x UF. UF = 0.5 for LC50 and EC50 values; no UF is applied to HC5 values. The selected toxicity value is usually the lowest acute endpoint in a standardized test; test species are generally Chironomus or Daphnia species.

Return to footnote 6 referrer

Footnote 7

Chronic Invertebrate ALRV = Toxicity value. UFs are not applied to chronic toxicity values. The selected toxicity value is usually the lowest EC50, NOEC or NOEL from a life-cycle test; test species are generally Chironomus or Daphnia species.

Return to footnote 7 referrer

Footnote 8

Non-vascular Plant ALRV = Toxicity value x UF. UF = 0.5 for LC50, EC50 and IC50 values; no UF is applied to NOEC and HC5 values. The selected toxicity value is generally the lowest endpoint in a standardized algae toxicity test.

Return to footnote 8 referrer

Footnote 9

Vascular Plant ALRV = Toxicity value x UF. UF = 0.5 for EC50 and IC50 values; no UF is applied to NOEC and HC5 values. The selected toxicity value is generally the lowest endpoint in a standardized plant toxicity test; the test species is usually Lemna gibba.

Return to footnote 9 referrer

Abbreviations:

LC50 = 50 percent lethal concentration

LD50 = 50 percent lethal dose

EC50 = 50 percent effect concentration

IC50 = 50 percent inhibition concentration

NOAEC = no observed adverse effects concentration

NOEL = no observed effect level

NOEC = no observed effect concentration

HC5 = 5 percent hazard concentration

UF = uncertainty factor

µg/L = microgram per liter

For additional information on the abbreviated terms visit the glossary of terms for environmental water monitoring for pesticides

Record of Data Changes
Date Change
July 2023 Changes were made to the ALRV table to standardize presentation of the ALRVs and to simplify use for water monitoring data analysis.
March 2023 A change was made to correct typographical errors for ALRVs for imidacloprid and malathion.

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