Department of Civil Engineering, Dr. Sudhir Chandra Sur Institute of Technology and Sports Complex, 540, Dum Dum Road, Kolkata-700 074, India Ex-Faculty, Department of Botany, Bankim Sardar College, Taldi, South 24-Pargana-743 329, West Bengal, India Department of Environmental Engineering, Narula Institute of Technology, Agarpara, Kolkata-700 109, India E-mail: staadrubaid@gmail.com, sushovan.sarkar@dsec.ac.in, ngkolkata47@gmail.com, samirmukherjee1100@gmail.com Manuscript received online 09 May 2020, accepted 25 July 2020 The fungi population in water has gained attention during the three decades. In this review, article attempt has been made to show its vulnerability as numbers of fungal species are now treated as water contaminants to indicate diseases in the human body. However, the importance of study of fungi has been less focused on surface water, groundwater systems and in agricultural wetlands. Time has come to correlate the population of fungi species isolated and identified from different sources of water-related with the climate change. The number of the fungal species are isolated and identified by the researchers may or may not have common occurrence but those definitely contaminate surface water at the different sources as well as different countries of the globe. In some cases, study has been made to analyze the occurrence of yeasts and filamentous fungi in the water body to investigate their correlation with bacterial indicator and faecal pollution1 .