Kingston officials are awaiting the results of bacterial tests being conducted by the state before deciding when to reopen the town’s shellfish beds. The state’s Division of Marine Fisheries closed the beds after the bay was polluted by an effluent spill from Plymouth’s sewage-treatment system in late April. Acting Town Administrator Nancy Howlett said Kingston stopped selling shellfishing licenses after the beds were closed. Seventy licenses have been sold this year, and the town usually sells 300 in the course of the season, which ends Oct. 31. Kingston’s shellfishing licenses are conditional because factors such as rainy spells or pollution can increase bacteria in the bay.