Willow Blog

California Residual Pesticide Testing

The state of California requires all cannabis goods batches to be tested for residual pesticide (s) prior to their release for sale to the public. The full list of tests can be found here, on our California Cannabis Testing page.

The required cannabis residual pesticide testing classifies pesticides into two categories.

Category I residual pesticides must be undetected, meaning under .10 µg/g.

Category I Residual PesticideCAS No.
Aldicarb116-06-3
Carbofuran1563-66-2
Chlordane57-74-9
Chlorfenapyr122453-73-0
Chlorpyrifos2921-88-2
Coumaphos56-72-4
Daminozide1596-84-5
DDVP (Dichlorvos)62-73-7
Dimethoate60-51-5
Ethoprop(hos)13194-48-4
Etofenprox80844-07-1
Fenoxycarb72490-01-8
Fipronil120068-37-3
Imazalil35554-44-0
Methiocarb2032-65-7
Methyl parathion298-00-0
Mevinphos7786-34-7
Paclobutrazol76738-62-0
Propoxur114-26-1
Spiroxamine118134-30-8
Thiacloprid111988-49-9


Category II residual pesticides must be under their respective action levels.

Action Level µg/g
Category II Residual PesticideCAS No.InhalableOther
Abamectin71751-41-20.10.3
Acephate30560-19-10.15
Acequinocyl57960-19-70.14
Acetamiprid135410-20-70.15
Azoxystrobin131860-33-80.140
Bifenazate149877-41-80.15
Bifenthrin82657-04-330.5
Boscalid188425-85-60.110
Captan133-06-20.75
Carbaryl63-25-20.50.5
Chlorantraniliprole500008-45-71040
Clofentezine74115-24-50.10.5
Cyfluthrin68359-37-521
Cypermethrin52315-07-811
Diazinon333-41-50.10.2
Dimethomorph110488-70-5220
Etoxazole153233-91-10.11.5
Fenhexamid126833-17-80.110
Fenpyroximate111812-58-90.12
Flonicamid158062-67-00.12
Fludioxonil131341-86-10.130
Hexythiazox78587-05-00.12
Imidacloprid138261-41-353
Kresoxim-methyl143390-89-00.11
Malathion121-75-50.55
Metalaxyl57837-19-1215
Methomyl16752-77-510.1
Myclobutanil88671-89-00.19
Naled300-76-50.10.5
Oxamyl23135-22-00.50.2
Pentachloronitrobenzene82-68-80.10.2
Permethrin52645-53-10.520
Phosmet732-11-60.10.2
Piperonylbutoxide51-03-638
Prallethrin23031-36-90.10.4
Propiconazole60207-90-10.120
Pyrethrins8003-34-70.51
Pyridaben96489-71-30.13
Spinetoram187166-15-0, 187166-40-10.13
Spinosad131929-60-7, 131929-63-00.13
Spiromesifen283594-90-10.112
Spirotetramat203313-25-10.113
Tebuconazole107534-96-30.12
Thiamethoxam153719-23-454.5
Trifloxystrobin141517-21-70.130

In addition to residual pesticide testing, California also tests for residual solvents and processing chemicals. Similar to residual pesticides, solvents and processing chemicals are classified in one of two categories.

Category I solvents and processing chemicals must be undetected, meaning under 1.0 µg/g.

Category I Residual solvent or processing chemicalCAS No.
1,2-Dichloroethane107-06-2
Benzene71-43-2
Chloroform67-66-3
Ethylene oxide75-21-8
Methylene chloride75-09-2
Trichloroethylene79-01-6

Category II solvents and processing chemicals must be under their respective action levels.

Category II Residual solvent or processing chemicalCAS No.Action Level µg/g
Acetone67-64-11000
Acetonitrile75-05-880
Butane106-97-81000
Ethanol64-17-51000
Ethyl acetate141-78-61000
Ethyl ether60-29-71000
Heptane142-82-51000
Hexane110-54-360
Isopropyl alcohol67-63-01000
Methanol67-56-1600
Pentane109-66-01000

For more information on the other mandatory tests required by the state of California, check out our article on California Cannabis Testing. Information on retesting and remediation for failed batches can be found on our California Remediation and Retesting page.

How to Work With Us

Willow can work with you by providing product cleaning services at your location or by selling and servicing your own WillowPure machine.

We’ll bring our technology and expertise to you!

Start-to-finish decontamination service:

• WillowPure technology delivered to your facility
• Access to best practices and recommendations
• Fast and efficient cycle time
• On-site experts to setup, operate, clean and repackage your product

Have your product be safe and sellable by making WillowPure part of your standard process. Willow will install your machine, train your staff and share best practices.

Not in Colorado? We provide out-of-state trials. We also make financing plans available.

Willow Industries - August 2, 2018