Washing Machine Drain Smells Like Sewer. It could be due to the growth of bacteria in the washer. The growth of such bacteria results in the release of hydrogen sulfide.

However, unlike many bathroom pipes, modern washing machines come with a flexible drain hose. Other reasons for sewer smells in the laundry room Washing machines should smell fresh and clean, but there is a range of reasons as to why your machine could end up smelling like sewage or rotten eggs.