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Water Quality Index (WQI) is a single dimensional number that aggregates information from many water quality parameters according to a defined method. WQI is accepted as an efficient tool for water quality management. In this study, WQI of Saigon river for public water supply was calculated from nine water quality parameters including pH, suspended solids (SS), dissolved oxygen (DO), chemical oxygen demand (COD), nitrite, ammonia, phosphate, total dissolved iron and total coliform based on water quality data obtained monthly from January 2016 to December 2019 at three sampling sites. The river water quality in terms of WQI was divided into 5 classes: class I, WQI = 90 to 100 (excellent); class II, WQI = 65 to 89 (good); class III, WQI = 35 to 64 (medium); class IV, WQI = 11 to 34 (poor), and class V, WQI = 1 to 10 (very bad). The method of inverse distance weighted (IDW) interpolation in geographic information system (GIS) was used to develop a map of river water quality. The results showed that most of WQI values belonged to class III (medium water quality with the WQIs of 35 64) and class IV (poor water quality with the WQIs of 11 34); and that a deteriorating trend was observed from upstream to downstream of Saigon river. Thus, the river water quality could not be used for public water supply.

WATER QUALITY ASSESSMENT OF SAIGON RIVER FOR PUBLIC WATER SUPPLY BASED ON WATER QUALITY INDEX