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Coronavirus COVID-19

COVID-19 Advisory: WSU Extension is working to keep our communities safe. All Extension programming is being provided virtually, postponed, or canceled. Effective March 16, 2020, WSU Extension county offices and WSU Research & Extension Centers will be closed to the public. We are available via email, phone, and webconference.

Pest & Plant Diseases

Program Contact: Paul Carter, County Director & Extension Agent
(509) 382-4741 •
Pesticide License Testing
TOLYMPUS DIGITAL CAMERAhe Columbia County Extension office offers WSDA Study Publication books at cost and pesticide testing.

It is strongly recommended that you obtain these publications prior to testing. Our office can order these publications for you, if we do not have them in stock. We try to keep a couple on hand at all times. Ordered publications will usually arrive in 2 to 3 days.

Our office is approved to monitor the following pesticide exams:

  • Private Applicator
  • Limited Private Applicator
  • Rancher Private Applicator

License fees vary depending on the exam. WSDA will notify you directly with your exam results and your license if you were successful. Please contact the Columbia County Extension Office at (509) 382-4741 to schedule an exam or order study materials.

Additional exam requirement assistance, required publications, and current fee schedules are located online. If needed you can contact WSDA toll free at 1 (877) 301-4555.

Other contacts at the WSU campus in Pullman: (509) 335-2830 or (509) 335-9222.