Idaho's Chemigation Program

Chemigation means any process whereby fertilizers or pesticides are added to irrigation water applied to land, crops or plants through an irrigation system, such as, but not limited to, agriculture, nursery, turf, lawn, golf course and greenhouse sites. Pesticide can refer to herbicides, fungicides, insecticides, rodenticides, etc. Chemigation may be used with surface, sprinkler and drip irrigation systems. Backflow is the reverse flow of water and chemical towards the irrigation water source, a process that the chemigation law is designed to prevent. 

Chemigation Equipment Training Video - New!

Idaho Pesticides and Chemigation Law (Chapter 34, Title 22, Idaho Code)

Idaho Rules Governing Pesticide and Chemigation Use and Application (IDAPA 02.03.03)

Required Agriculture Chemigation Equipment

Idaho's List of Approved Chemigation Equipment

Idaho's List of Approved Chemigation Equipment - RP (Reduced Pressure)

Approved Injection Line Check Valves

Chemigation Equipment Approval Form

Independent Lab Chemigation Equipment Approval Form

Professional Applicators with a Chemigation (CH) Category

Inventory of Chemigation Systems Form

Urban Chemigation Guidance

Idaho Chemigation Study Manual – available at the ISDA Boise Office

For more information concerning Chemigation, please contact:

Westy Pickup, Chemigation Program Specialist
Idaho State Department of Agriculture
Division of Agricultural Resources
IFQAL – 1180 N. Washington St.
Twin Falls, ID 83301
(208) 736-4759
Fax - (208) 736-4780