I have already paid membership dues in a different state. Do I need to pay the dues again in Washington/Northern Idaho?

You must pay the full membership dues for each club that you are on a GHIN roster for. Those membership dues are more than just a GHIN Handicap fee. It is a WA Golf membership that provides many benefits and services to individual members, member clubs, and golf facilities. 

It is important to maintain the same Handicap ID/GHIN Number for every club that you belong to.

To get access to the full WA Golf member benefits, including eligibility to participate in WA Golf events, you need to sign up for a membership through a WA Golf authorized club.