For Qom city, the revision in consumption patterns and saving the household water consumption is a priority. Chargeable prepaid water meters are effective tools for consumption management that can provide necessary feedback for consumers. This study peruses the impact of prepaid meters on household water consumption management. A relationship has been investigated for the use of prepaid meters with the management of household water consumption and the costs of Qom Water and Wastewater Company. Data of this research has been analyzed by use of descriptive and inferential indicators using the methods of inferential statistics such as the mean of two Dependent Statistic Societies. Sampling was the main tool of this study and a part of the data of survey has been collected with use of a questionnaire containing closed questions. Simple random was the basis for the sampling. Library resources have also been used. The results show that considering the "temperature” as an affecting factor, the prepaid meters has been saved %14.36 in water consumption of households. Neglecting the temperature changes, per capita of water consumption has decreased by %13. The use of prepaid meters has decreased the Qom Water and Wastewater Company costs by 53% due to the skipping of reading services of the postpaid meters.