Investigate of home water treatment systems efficiency in Ahvaz city 2013

This study is descriptive - cross sectional and  during  the 8 months from  winter of 2012 to spring and summer 2013 was performed . In this study at first, with preparation and organization the questionnaire, information about  usage, type and functionality of household treatment systems were collected. Then from 20 Household water treatment ،after water treatment, the samples were taken. samples for examined , dissolved oxygen, conductivity, pH, total dissolved solids, total hardness, fluoride, nitrate, chloride and microbial quality of water, according to instructions provided in the latest edition of standard methods(2012), were tested. Sampling in 5 different  locations in Ahwaz city that  covered by 5 treatment plant was performed.Mean quality parameters of pH, electrical conductivity, total dissolved solids, dissolved oxygen, total hardness, fluoride, chloride, nitrate and MPN values​​, respectively, about 8.26, 338.37, 163.61, 2.76, 78.4, 0.08, 55.84, 0.577 and 5.39 are measured. The investigations also revealed that treatment systems, make acceptable standard for some parameters of  drinking water  such as pH& EC but led to a sharp decline in the values ​​of other parameters -TDS, DO total hardness, chloride, fluoride and nitrate- below the drinking water standards & Have been no effect in reducing microbial contamination.