TREND ANALYSIS RELATING TO TOTAL COLIFORM IN THE SURFACE WATER OF THE SAIGON AND DONG NAI RIVERS, PASSING THROUGH BINH DUONG PROVINCE

Abstract

Assessment of coliform criteria in surface water is an essential part of monitoring programs and ensuring water quality. Therefore, this study was conducted with the aim of evaluating the fluctuation trends of total coliforms in the Saigon and Dong Nai Rivers sections flowing through Binh Duong province using regression modeling and Mann‒Kendall test. The coliform ranged from 1921 to 2145 MPN/100mL and from 1969 to 2064 MPN/100mL in the the Saigon and Dong Nai Rivers, respectively. Most of the coliform values were within permissible levels in the national technical regulation on surface water quality. However, the Mann‒Kendall test results revealed an increasing trend in coliform levels at monitoring stations on both rivers from 2015 to 2021. This is an alarming indication of the deteriorating water quality trend. It requires careful monitoring in the future since the Saigon and Dong Nai Rivers are the primary sources of water supply for production and domestic use in Binh Duong province.