This is a documentary about the history of water supply of St. Petersburg. About extraordinary people, who has spearheaded the plumbing business in Russia, the colossal work of «Vodokanal» in nowadays, the perspectives of development. This film is also about the construction of the first sewage treatment plant, the first collector sewer. About the exploits of «Vodokanal» workers in besieged Leningrad, the post-war recovery networks.About how «Vodokanal» has always acted responsibly and with dedication to the vital work of the city, regardless of the social system, the war, the economy, and above all by the fact that water is life.