It is important to have your drains assessed to check for problems in the line to the sewer.
Issues such as tree roots in the system, a blockage between your home and the main sewer in the street, wastewater backup in the sewer system (or a combination of wastewater and rainwater from the sewer system) can all cause problems.
If a camera inspection shows any problems an NFP certified plumbing company can
explain how this can be rectified.