If the beach is commonly owned, there may be provisions in the deeds themselves, in subdivision documents or in common covenants that govern these decisions. You may be able to find these documents by searching public records on line.
Start with the title of the property governed and you may find the developer set up a Homeowner's Association and that status will be a non profit corporation under RCW 64.38 and the rules will be set forth in the governing documents. The Association must use the courts to enforce the rules.
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