Washington Pesticide Laws and Safety Practice Test

Recertification of license holders (excluding limited and rancher private applicator) requires 40 credit hours every five years. This may seem like a large number, but it ensures that license holders stay up-to-date with any changes or advancements in their field. Option A (30 credit hours) and Option D (60 credit hours) are incorrect because they are below or above the required amount for recertification. Option C (50 credit hours) may seem like a possibility, but it is incorrect because it includes the limited and rancher private applicator licenses, which are excluded in the question. Therefore, Option B is the correct answer.