The zoning of surface water quality by WQI index in the Tien Giang province, Vietnam


  • Thi Anh Thi Nguyen* University of Labor and Social Affairs, Ho Chi Minh city, Vietnam
  • Ngoc Han Bui Ritsumeikan Asia Pacific University, Japan


According to Decision No. 711/QD-TCMT of the Ministry of Natural Resources and Environment, the water quality index (WQI) formula has been adjusted toward localisation, particularly, for the Nhue Day and Cau river basins. In this work, the WQI formula was amended by adjusting the weights of the components of surface water quality. This is an advance forward toward enhancing the effectiveness of local environmental management so that local economic development conditions are shaped according to its own potential and in accordance with the natural characteristics and culture of the regions. Based on surface water quality data from 2012 to 2019 in Tien Giang and the theory of fuzzy entropy weighting to identify component weights, this study adjusted the WQI formula in accordance with natural conditions as well as special characteristics of the socio-economic development of Tien Giang. Finally, a zoning map of surface water quality in the province was set up.


Tien Giang province, water quality index, water quality management, zoning water quality, 711/ QD-TCMT


Classification number





Received 11 August 2020; accepted 10 November 2020

How to Cite

Thi Anh Thi Nguyen, & Ngoc Han Bui. (2020). The zoning of surface water quality by WQI index in the Tien Giang province, Vietnam. Vietnam Journal of Science, Technology and Engineering, 62(4), 71-76.



Environmental Sciences