Chemigation is the application of pesticides using an irrigation system. Only pesticides registered for chemigation can be used in irrigation systems. The pesticide label will state the registration status and identify approved irrigation systems, safety measures, and worker protection requirements. The installation of a backflow safety device ans system interlocks is required for irrigation systems before the addition of pesticides is allowed. Only certified applicator or those under the supervision of a certified applicator can apply pesticides through an irrigation system.

More information can be found on the WSDA' Chemigation and Fertigation webpage and the ISDA's Chemigation Equipment webpage.