Here is what I found from the WDFW page on the Washington plates. "Over 90% of the purchase and the entire renewal fee supports the conservation and management of our fish and wildlife resources"
Initial license plate purchase: $ 44.00
Annual renewal fee: $ 30.00

If I remember right it goes to help non game type of animals in Washington.
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Remember always "Fish 4 Fun"
Puget Sound Anglers -Renton Chapter-
Co-Event Coordinator Salmon For Soldiers