The type of license you need depends on who your employer is and what type of pesticides you will be applying. Required exams are listed under each license type. To qualify for most licenses, you need the Washington Laws and Safety plus at least one category. You may need more than one category depending on your field of work.
To qualify for a license, you will need to take and pass one or more exams. The license category, or classification, you need is based on the kind of pest control work you will be doing. Certain license types and specific kinds of applicators will only need one stand-alone exam. Other license types require the Washington Laws and Safety plus all categories in which an applicator operates.