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The paper presents data on the rates of Lamblia cyst dissemination of surface water sources in foreign countries, the Russian Federation, Moscow, and the Moscow Region. It shows a role of drinking water in the spread of intestinal parasitic diseases. In accordance with parasitological parameters, specific data on improvement of methodological control of water quality are presented. The dosages of ultraviolet radiation are given in relation to water decontamination of parasitic disease germs.

The paper shows it necessary to exercise control over the quality of natural, waste, and portable water in terms of parasitological indices. The standard techniques of sampling and sanitary and parasitological studies of water, which allow water quality control to be effectively exercised in accordance with the current sanitary regulations, are considered.

The paper provides evidence that Cryptosporidium oocysts should be necessarily included as an index of the epidemic safety of drinking water in our country. This is evidenced by: the wide spread of cryptosporidiosis among animals and human beings; that of the pathogen of this disease in the environment; large-scale outbreaks of cryptosporidiosis in the world's population; no sanitary and parasitological drinking water monitoring in our country; the use of this parasitological index to evaluate drinking water quality in some countries (USA, UK, Ukraine, etc.).