Drinking water produced for sale and consumption is becoming popular, which is drinking water from coin-operated water dispensers because it is relatively cheap, convenient, easy, fast and economical. It was found that there are currently many coin-operated water dispensers installed by manufacturers and distributors of many brands of coin-operated water dispensers, both in densely populated communities and residential areas. From a survey of 113 coin-operated water dispensers in Khon Kaen Municipality, it was found that 48 used the RO filter system, 23 used the RO+UV system and 2 used the RO+OZONE system. From the survey, it was found that the RO filter system is popular in producing coin-operated water dispensers because it is a system that can filter more finely than other types of filters down to 0.0001 microns, which is close to the water molecule. The acidity-alkalinity test of drinking water from coin-operated water dispensers using the Universal Indicator Strips test kit found that 49.56% (56/113) did not pass the standard criteria. The test results showed that the values were between 5.0 - 6.0, while the standard criteria for testing are set to be between 6.5 - 8.5 From the hardness test of drinking water from coin-operated drinking water dispensers using the Water Hardness Indicator Strips test kit, it was found that 54.87% (62/113) did not pass the standard. The hardness was 125 mg/L for 62 dispensers. From the biological quality test of drinking water from coin-operated drinking water dispensers using the coliform test kit in water, it was found that 92.03% (104/113) passed the standard and 7.96% (9/113) did not pass the standard, respectively. This may be due to the lack of care and maintenance of coin-operated drinking water dispensers, which caused algae to form around the water dispenser head and the area holding the water container, leading to contamination by coliform bacteria. Therefore, it is necessary to conduct a survey and re-inspection of coin-operated drinking water dispensers that did not pass the standard.