Water being a good solvent, is prone to physico chemical and microbial contamination. Municipal sewage, both treated and untreated is often released into the receiving water bodies, which influence water quality.

To obtain an assessment of bacteriological quality of drinking water of the district of Lakhimpur, Assam as many as 168 drinking water samples were collected from different sources of the district and analysed. During analysis it was found that 58.2% samples have coliform MPN more than 10 and 40% have faecal contamination.

The present study was designed to assess the nature and present status of the two permanent Ranipettai reservoirs viz., Clive Bazaar and Talankur Lakes aeas, Arcot, Vellore with special reference to zooplankton biodiversity.

Water samples were collected from different places in Godavari River located at Sangam point in Maharashtra and Basar point in Andhra Pradesh. The results obtained are compared with drinking water standard (BIS-10500). The results obtained envisaged that pH value of drinking water samples were slightly neutral but the maximum pH was recorded in the site III at Bastar point (Andhra Pradesh) sampling location and minimum value 7.22 was noticed in site III at Sangam point.

In this review paper interaction of arsenic with iron hydroxide and effects of anions, such as silicate, phosphate and bicarbonate on arsenic adsorption by iron hydroxides, are discussed. Arsenic is strongly adsorbed on the surface sites of iron hydroxides through the formation of inner-sphere complexes.