From the Charlestown Harbormaster: Mooring permits at this time are only available for immediate issue to residents who own Water Front Property. Public Recreational Mooring Permits are only issued to applicants currently on the Mooring Permit Waiting List. Applications to be placed on the waiting list for Quonochontaug or Ninigret Ponds, may be made via this link. If renewing an existing mooring permit, applications need to be current on all fees, the applicant can provide proof of boat ownership, and mooring gear inspections are current.
More mooring application information here.