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Microbiological Quality of Available Water Sources in and around Tribal Areas of Araku Valley Mandal, Visakhapatnam District, AP, India

Author Affiliations

  • 1Department of Environmental Sciences, Andhra University, Visakhapatnam, India
  • 2Department of Environmental Sciences, Andhra University, Visakhapatnam, India

Int. Res. J. Environment Sci., Volume 5, Issue (12), Pages 19-27, December,22 (2016)


In the study microbiological analysis was performed in the water sources like spring, tank well and bore water of Tribal Villages of Araku valley Mandal, Visakhapatnam, (District) Andhra Pradesh, India. Eighteen samples had been collected during the period 2014-2015 in pre and post monsoon and analysed microbiologically by MPN/100ml, Faecal coliform, HPC and faecal streptococci it was observed that 85% of water sources were not up to the mark of Bureau of Indian Standards BIS & World Health Organization (WHO) limit. The water that was collected from spring and well was mostly contaminated, Most Probable Number (MPN) count range between 39-1100MPN/100ml. The mean counts of Faecal coliform in spring, tank and well are found to be high than bore and the HPC range from 2.22×104 CFU to 6.02×104 CFU and faecal streptococci range from 0.037×104 CFU/100ml to 1.32×104 CFU /100 ml, in spring, tank, well and bore samples. Hence it is resulted, the samples of well, spring and tank were above the prescribed limit of BIS, 2006. Isolated and identified organisms were Escherichia, staphylococci, salmonella, shegeila species, vibrio species, pseudomonas species, aeromonas etc. Thus the results revealed that the frequency of water borne diseases in the area is high in post monsoon season this may be due to the water consumed. Thus the findings of the microbiological water quality suggest that the water sources have direct effect on the health conditions of the tribes. Hence the water from this area is mostly contaminated and suggested to treat properly before it consumed or to look for alternative sources for drinking.


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