This study has been done on the seepage affected Titas gas field in Brahmanbaria, which is the biggest gas field of Bangladesh. Here the authors emphasizes the pollutions occurred due to natural gas seepage and analyzed the degree of impacts on environment. The authors believe that this study will serve as a documentation for analyzing similar seepage problems that causes severe environmental pollution. Also this study includes water quality index of the seepage affected water sources that helps to get an overall idea of the degree of pollution.