The corrosivity of water supplies need to be evaluated in view of the aesthetic problems in water and also because of the potential public health importance. As such, some recent work on mild steel deterioration has been carried out. The results assessed from weight loss measurements for different chemical mediums support the chloride aggressiveness reported in literature. But the relative behaviour of other ions vary with time being lesser in concentration as per potable water quality standards. Potentiostatic polarisation results have also been carried out to determine the effect of different anions and time on corrosion rate through changes in potential. The corrosion potential (E-corr.), corrosion current (I-corr.), Tafel slopes, corrosion rate have been obtained from polarisation experiments using a three electrode set-up. For reliability of results, the data has been statistically analysed.