Water quality index assessment of domestic water supplies in system tank

The study was confined toa system tank zone of River Noyyal in Coimbatore. The ground water and surface water of the monsoon and post-monsoon seasons were analyzed for various physico-chemical parameters. The Parametric Water Quality values in the respective units of measurement were found to be in the IS permissible ranges prescribed for EC (3to15dS/m), pH(6.2to 6.8), Total dissolved salts (500 t0 2000) and sulphates (200 to 400). The overall quality indices for both surface and ground water were arrived at in a gradation system of weightage limits from 1 to 5, as less hazardous to severely hazardous status. The indices established the values in the moderate range of 2.3 to 3.8, suggesting the feasibility of quality sustained domestic water supplies.