Helicobacter pylori is found commonly in the gut of the human beings and animals. This bacterium is found usually when patients suffer from upper GI infections.  H. pylori has been found in the patients in antral biopsies in Mumbai, India. We have found H. pylori in antral biopsies and faeces in another study we have done. The mode of transmission of H. pylori is yet not confirmed although two routes are proposed : faecal-oral and oral-oral. Many studies have found that H. pylori survives in water in viable or viable but non-culturable forms. We found H. pylori in Mumbai water samples collected from different places by culture and PCR. Thus, we propose water as the possible vehicle of transmission of H. pylori infection.