Assessment of drinking water quality of a coastal village of Karachi [Pakistan]
2004
Hasnie, F.R. | Qureshi, N.A.,Karachi Univ. (Pakistan). Center of Excellence in MarineBiology
The drinking water quality of a coastal community in Rehri village, Karachi was assessedfor human consumption by studying the chemical and microbiological parameters to determinethe suitability of domestic drinking water usage. Water samples were collected at householdlevels from storage tanks and storage containers (earthen jars), main supply line and springspresent in the vicinity. Samples collected from different sources indicated that bacterialcounts were high for the storage tanks than the earthen jar containers. In storage tanks 71%samples were in high to very high health risk category whereas, in earthen jars 50% sampleswere in low health risk category. Water samples from two springs showed that samples ofChashma spring had high bacterial count (336 MPN index/100 ml) coupled with highconcentration of NO3 (29.681 mg/l) as compared to Rehri spring (41 MPN index/100 ml, 8.417mg/l, bacterial count and nitrate concentrations, respectively). All samples collected athousehold level showed that bacterial contamination exceeded the maximum acceptableconcentration. Other parameters (NO3, NO2, NH3 PO4, free Cl, Ca and Mg hardness) studiedincluding trace elements (Fe, Cu, Cr) in the drinking water were below the WHO drinkingwater quality guidelines. Fecal coliform, Escherichia coli was also detected including importantpathogens Serratia sp. and Enterobacter sp. which were isolated and indicated possible fecalcontamination of drinking water at all levels.
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