The quality of the water for living in Thecho village of Nepal was reappraised for arsenic, fluorine and remaining chloride. In this inspection, we measured exact concentration of arsenic by using an atomic absorption spectrophotometer. Arsenic was not detected in any samples, although in the previous inspection using the simplified method arsenic was indicated be contained in all samples. This result indicated that water in the village was safe as for arsenic. In addition, we measured remaining chloride which was not examined in the previous inspection. Remaining chloride was not detected in city water which was treated by bleaching powder. This means that bacteria might grow easily and is a problem for which corrective steps should be taken. Furthermore fluorine was also measured exactly using an ion meter. Concentrations of fluorine in all samples were less than 0.2 mg/l. This result confirmed the previous inspection and gave the base to significance of mouth rinsing with fluoride.
