This paper has the objective of proposing a Raw Water Quality Index (RWQI) influent for the conventional water treatment plants that allow the comparison of the treatability of distinct surface water sources. The Delphi methodology was employed similarly to that employed for the development of Water Quality Index, in the beginning of the 1970's, with a panel composed by 24 specialists. According to the panel opinion, the RWQI was composed by eight water quality parameters usually monitored in a significant portion of Brazilian plants. Its application on five surface water sources allows the recommendation of its use as an additional tool for the assessment of the performance of water treatment plants operated by the Brazilian sanitation companies.
water quality; water quality index; water treatment
