Facing issue with borewell water, it is smelling like sewage water and getting bubbles

Hi Team,

This is Adithya from Hyderabad city Moula Ali area. I have an independent house situated at Moula Ali, Jawahar Nagar colony. We dug a borewell in the year 2005 with 300 ft depth, after that we flushed it in the year 2011 and then we never had a water problem. However, from past one year we are facing issue with the bore water. In 2018, there was heavy rainfall in our area and when we switched on the bore, water is smelling like sewage water and getting bubbles. Please help me out with suggestions on how to avoid the situation. Do let me know how and whom I need to approach to solve the issue and what will be the charges?