Objective To apply an improved integrated index method to evaluate the quality of piped drinking water.
Methods Altogether 34 indicators of water quality including microbial, carcinogenic, general toxic, organic pollution, sensory and general chemical indices were selected into a comprehensive assessment system of drinking water. The candidate indices were classified into five categories according to various hygienic significances. The comprehensive index methods of Nemerow index, minimum operator, and weighted average were improved and applied flexibly to evaluate the drinking water quality in ten residential communities in Changning District of Shanghai in December 2008.
Results The integrated index values of drinking water samples were in the range of 0.34-1.26, significantly lower than the drinking water supplied in the municipal network. The main factors influencing the drinking water quality were pH, turbidity and chemical oxygen demand (COD).
Conclusion The quality of drinking water in Changning District is comparatively better than the municipal water supply network, but some indices require special attention.
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