The study was carried out in Dumbriguda Mandal by collecting and analysing the physic- chemical parameters of water samples (four open well, two bore and one spring) during April - October 2015. The results were compared with standards prescribed by WHO and ISO 10500-91. The parameters including pH, electrical conductivity (EC), total dissolved solids (TDS), turbidity, dissolved oxygen (DO), total alkalinity (TA), total hardness (TH), calcium (Ca2+) magnesium (Mg2+), Fluoride (F-), Sulphate (SO42–), chloride (Cl–), nitrate (NO3–), phosphate (PO43–) and BOD (Biological Oxygen Demand) were analyzed. The quality of water source of, each parameter was compared with the standard desirable limit of that parameter in drinking water as prescribed by Indian Standard 10500-91 and WHO. The comparison of different parameters spatially showed an increasing pattern in Electrical Conductivity, Total Dissolved Solids, Turbidity, Calcium and magnesium, DO, and Phosphates concentrations. Turbidity and TDs are highly correlated in pre monsoon, where as in post monsoon BOD and Do are strongly correlated in pre-monsoon season and in post-monsoon season, the influence of TH on EC, MgH, DO and CaH were also observed with significantly positive – correlation .The WQI has been calculated by using the standards of the drinking water quality recommended by the WHO. WQI was registered was 63.110 in the range of poor water quality category (WQI-76-100) in pre monsoon period and 94.98 under the category (76-100) of very poor water quality range for post-monsoon. The study shows very poor quality of water sample from all 07 locations across Dumbriguda Mandal for drinking purpose as per the water quality index.
Prof. Dr. Bilal BİLGİN