One of the main purposes of use of water has a direct importance for living activity of the man - it is its consumption for household and drinking needs. Only few of the inhabitants of cities have an idea about structure of water consumption. only 5 % of water, consumed by the man, is spent on drinking and preparation of food. According to calculations of the American scientists, most of consumed water - 43 % - is spent in a toilet, a bath and shower require 34%, washing dishes - 6 %, laundering - 4 %, cleaning of apartments - 3 %, other needs, including car washing, require - 5%. All in tall, household consumption of water makes 220-230 l on the person per day.