The island's best rating beaches were Naiharn, Surin, Kata and Karon, which all earned four stars. So did the beach on He island.
Nearby, Koh Racha went one better, rating five stars.
Both Racha and He islands are south of Phuket and popular with divers.
More than 300 beaches were assessed around Thailand by officers from the department. ''Clean, quiet, and secluded'' were the three key attributes they were looking for.
Rawai Tessaban claimed credit for three of the high-ranking beaches that fall inside their jurisdiction, Naiharn, Koh Racha and Koh He.
The mayor, Aroon Sorod, said: ''We try to keep all our beaches as clean as possible and vendors making sales to swimmers are not permitted.
''At Naiharn, we have some beach shopkeepers, and they do a great job keeping the beach the way it should be.
''Next year, we'll try to make sure Nui, Ao Sane, and our other beaches also measure up.''
The department's permanent secretary, Pimuk Simaroj, said he hoped the star system would inspire more local authorities to meet higher standards.
''We will keep coming back to check every year,'' he said. ''Beaches can win extra stars, and lose them, too.''
Thailand's best five-star beaches are in Satun province, Khun Aroon said.
Perhaps to protect the reputation of unranked but popular beaches, only those rating four or five stars were mentioned.
Final Word on Phuket and Asean Due Monday: PM
Latest The prospects of Phuket hosting the October Asean summit of 16 national leaders has seen more swings and roundabouts than a carousel. A final decision is due on Monday.
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Tsunami Dead Drowning in a Wave of Apathy
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I notice a bacterial count is missing from the survey, or were counts done and the results too noxious to print? With raw sewage visibly running into the sea, at least at Surin and Bang-Tao, hard to see how the water around Phuket could be called, "clean."
Posted by Ex- Pat Biologist on August 20, 2009 07:53