Globally, the COVID-19 pandemic has had significant effects on human life and the environment, especially freshwater ecosystems. Despite its many effects, the pandemic has increased the quality of the environment, making it possible to recover devastated ecosystems. During the lockdown period of COVID some improvements in environmental quality was observed in different parts of the world by many researchers. Due to increased manufacturing and urbanization over the past few decades, Dhaka's periphery rivers have become heavily polluted. Hence in this study an attempt has been taken to depict the post covid surface water quality status of heavily polluted Turag river in Bangladesh. So, for the first time, a GIS-based spatial analysis of water quality index was used to try to measure 16 water quality parameters (pH, EC, temperature, turbidity, salinity, TDS, DO, Na+, K+ Ca2+, Mg2+ Cl−, Cu, Pb, Fe, Cd) in the water of the river Turag. So, it could be used as a point of reference for future research in Bangladesh. At first WQI for the collected samples were calculated and it was observed that all the sampling stations water quality status were extremely poor since WQI > 100. Kriging method of interpolation was used to predict the engulfing WQS and visually present those using GIS maps. The upshots of this study is extremely alarming as 100% of the observed samples WQS exceeded the standard limits. On the basis of these findings, we advocated the immediate implementation of appropriate water management methods and policies in order to manage and protect the water resources.