Drinking water quality analysis in the city of Caçapava do Sul - RS between 2006 and 2016

Abstract

Monitoring key chemical parameters of drinking water over time is essential to ensure that the quality of public supply is maintained and that treatment processes evolve according to local needs. This study assesses the quality of raw and treated water in the city of Caçapava do Sul, Rio Grande do Sul state, Brazil, based on 160,986 water analyses conducted over a decade (2006 to 2016) and collected at the CORSAN Water Treatment Plant (WTP). The objectives of the assessment were to verify the efficiency of the treatment process applied at the WTP and to understand the influence of precipitation on the quality of raw water. The effectiveness of the treatment is discussed in relation to Iron, Manganese, Residual Aluminum, Color, Turbidity, pH, Alkalinity, Total Hardness, Dissolved Oxygen, BOD5,20, Organic Matter, Fluoride, Free Residual Chlorine, Odor, and Taste. Results indicate compliance with current brazilian water quality regulations, but with a visible impact of seasonal variations and climatic events on the quality of raw water.