The lecture on the history of Petersburg's water supply shows the city from an unexpected perspective - through pipes, filters, engineering solutions, and the everyday habits of its residents. It tells the story of how water came into homes, what myths accompanied this journey, and why the familiar comfort turned out to be the result of long and complex work. We rarely think about the water supply while water flows reliably from the tap, but it is such unnoticed systems that largely determine the quality of urban life. The history of Petersburg's water supply is not only a story about engineering solutions but also a path of constant overcoming: technical difficulties, sanitary risks, controversial ideas, and urban myths. The lecture offers a chance to look at Petersburg from an unusual angle and see how behind everyday convenience lies a long history of search, mistakes, and precise calculations. At the center of the discussion is the establishment of the modern water supply system of the city. Listeners will learn what obstacles had to be overcome to provide Petersburg with water, how perceptions of its quality and safety changed, how the disinfection system was designed, and when water meters appeared in apartments. Such details are particularly interesting as they allow understanding the city not through facades and ceremonial routes, but through the hidden infrastructure without which its normal life is impossible. Particular interest is drawn to little-known photographs and the analysis of common misconceptions. Water supply here turns out to be part of the larger story of Petersburg - with its ambitions, miscalculations, search for solutions, and constant striving to make life safer and more comfortable for its residents. Among the topics of the meeting is the question of why Lake Ladoga never became an alternative source of water for the city, even though such an idea seems quite logical. The speaker of the meeting is Ekaterina Vasilyevna Shiryayeva, senior specialist of the Water Universe Museum complex. Our website features the current program of Saint Petersburg.