Already the west coast hub had to import electricity and water and the need for a focus on ''sustainability'' was growing, he told a meeting of Patong Municipal Council.
Mayor Pian said that Patong was using 30,000 cubic metres of water a day but the holiday city only had the capacity to treat 25,000 cubic metres of wastewater.
When asked what happened to the missing 5000 cubic metres, the mayor did not respond. He said there was a need to have the capacity to keep pace with waste water.
By the mayor's estimate, 600,000 to 700,000 people regularly use the city's infrastructure but only 19,907 citizens are registered residents.
He said he believed the population of Patong could grow even larger - possibly to one million - at times during the high season.
Those figures may not be precise but the mayor did say Patong alone was producing 180 tonnes of garbage a day, with the fee for disposal paid to Phuket City Council amounting to 540 baht a tonne.
''We cannot stop development,'' the mayor said.
''From now on, we have to pass on knowledge about sustainability. The environment is the most important thing.''