Drinking water quality and evaluation of environmental conditions of water vending machines

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Rapeepan Yongyod


A survey of 55 water vending machines in Chiang Khruea Sub-district, Mueang Mistrict, Sakon Nakon Province was conducted to evaluate the water quality from vending machines and environmental conditions of their locations. Laboratory analyses of the samples consisted determination of pH, turbidity, total solids, total dissolved solids, hardness, total coliforms, fecal coliforms, in addition to a survey of the general hygienic conditions of each location.


The results showed that the turbidity value met the drinking water standard and the pH value baseline was in the range of 6.5-8.5. Some of the water samples exceeded the government’s drinking water standard. Hardness values set by the Public Health Act of 1992, under the Department of Health are 100 mg/l or less as CaCO3. Total coliform bacteria were in the range 2-2,400 MPN/100 ml and fecal coliform bacteria were found to be 0‑2 MPN/100 ml. Sanitation of the surroundings was evaluated according to six criteria.


It was determined that there should be an improved level of recording and reporting as well as increased drinking water quality control. Maintenance and the hygienic condition of the machines were poor. Government regulators should control the entrepreneurs and monitor drinking water quality. Entrepreneurs should always maintain water quality standards according to government regulations.


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