Washington Pesticide Licensing and Certification

About 5 of every 50 questions on a Washington Laws and Safety practice exam come from this topic.

Sources checked November 6, 2026

What to know

Washington pesticide licensing is run by the Washington State Department of Agriculture (WSDA). A business that applies pesticides to the land of another needs a commercial pesticide applicator license, and its employees who apply manually or run a licensed apparatus need a commercial pesticide operator license unless they are licensed commercial applicators. Private applicators use restricted use pesticides to produce agricultural commodities; private-commercial applicators use them for other purposes; government employees who use restricted use pesticides or any pesticide by apparatus need a public operator license, valid only while working for the agency; and businesses that apply pesticides only incidentally, such as dog groomers, are exempt from commercial licensing. Every applicant must be at least 18 on the application date. Most licenses expire on the December 31st after issuance and must be renewed on or before January 1st to avoid a penalty, while limited and rancher private licenses run to the fifth December 31st. Applicants other than structural pest inspectors pass a closed-book laws and safety exam and must be certified by exam in each classification they work in; when owners do not apply pesticides, the person managing applications must be licensed in all of the business's classifications, and licensed applicators may supervise unlicensed ones only in classifications they hold. The passing score is 70 percent unless WSDA validates another, and a passing score counts for the exam year plus the next calendar year. Limited specialty classifications allow general use pesticides only, and WSDA may waive exams for holders of comparable EPA- or Canadian-approved certification. Since January 1, 2026, a second through fourth failure means a 14-day wait before retesting and five or more failures a 60-calendar-day wait. Recertification every five years is by exam or by credits: 40 credits, at most 15 a year, for most license types and 20, at most 10 a year, for private applicators. Commercial applicators must show a surety bond or liability insurance before licensing, the director gets ten days' notice before cancellation, and the license is automatically suspended when coverage lapses. Licenses may be denied, suspended or revoked for listed acts, including possessing or removing a licensing exam and, since 2026, a FIFRA 14(b) conviction; violations are misdemeanors, repeat offenses within five years gross misdemeanors, and each violation is a separate offense for civil penalties.

Where it comes from

• RCW 17.21.020, 17.21.070, 17.21.110, 17.21.220, 17.21.200
• RCW 17.21.128, 17.21.132, 17.21.134
• RCW 17.21.160, 17.21.170, 17.21.180
• RCW 17.21.310, 17.21.315
• WAC 16-228-1530, 16-228-1540, 16-228-1545
• WAC 16-228-1500 (as amended by WSR 25-22-065, eff. 1/1/2026)

Try a practice question