С9 – Drinking water quality
The number of drinking water samples taken, of which the number of samples that do not compliant with hygienic standards;
proportion of samples exceeding national hygienic standards.
Proportion of samples tested for microbiological parametres not compliant with hygienic standards
Proportion of samples tested for sanitary chemical parametres not compliant with hygienic standards
Drinking water is water that compliant with the safety standards for drinking water.
Drinking water safety standards are a set of parametres established by hygienic standards that ensure the epidemic safety of drinking water by microbiological (biological) parametres, radiation, chemical safety and favorable organoleptic characteristic.
Hygienic requirements for the drinking water quality are established by sanitary rules and regulations 2.1.4. “Питьевая вода и водоснабжение населенных мест. Питьевая вода. Гигиенические требования к качеству воды централизованных систем питьевого водоснабжения. Контроль качества. Санитарные правила и нормы СанПиН 10-124 РБ 99” (“Drinking water and water supply of localities. Drinking water. Hygienic requirements for water quality in centralized drinking water supply systems. Quality control. Sanitary rules and norms SanPiN 10-124 RB 99”) (hereinafter - Sanitary rules), approved by Decree No. 46 of the Chief State Sanitary Doctor of the Republic of Belarus, October 19,1999.
Hygienic requirements for the drinking water quality in decentralized drinking water supply systems are established by СанПиН 8-38-98 RB 98.
The epidemic safety of drinking water is determined by the absence of pathogenic bacteria, viruses and protozoa in it, its compliance with the standards for microbiological and parasitological parametres (thermotolerant coliform bacteria; total coliform bacteria; total microbial count; coliphages and lamblia cysts (determination is carried out in water supply systems from surface sources before supplying water to the distribution network), spores of sulfite-reducing clostridia (determination is carried out when assessing the effectiveness of water treatment technology) (given in table 1 of the Sanitary Rules).
The chemical composition of drinking water harmlessness is determined by its compliance with the standards for:
general parametres (hydrogen index; total mineralization (dry residue); general hardness; permanganate oxidizability; oil products in total; surfactants, anionic; phenolic index) and the content of harmful chemicals most often found in natural waters of the Republic of Belarus, as well as substances of anthropogenic origin that have received global distribution (aluminum, barium, beryllium, boron, iron, cadmium, manganese, copper, molybdenum, arsenic, nickel, nitrates, mercury, lead, selenium, strontium, sulfates, fluorides, chlorides, chromium, cyanides, zinc, γ-HCH (lindane ) and others (given in table 2 of the Sanitary Rules);
the content of harmful chemicals entering and forming in the water during its processing and in the water supply system (residual free chlorine, residual bound; chloroform (during water chlorination); residual ozone, formaldehyde (during water ozonation); polyacrylamide; activated silicic acid; polyphosphates; residual the amount of aluminum and iron-containing coagulants; chlorine dioxide (given in table 3 of the Sanitary Rules);
the content of harmful chemicals entering water supply sources as a result of human economic activity (given in Annex 2 of the Sanitary Rules).
The data producer is the Ministry of Health (administrative data).
Relevance of the indicator:
The indicator characterizes the degree of compliance of drinking water quality with drinking water safety standards and allows to determine the risk of negative impact of poor quality drinking water on human health.
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