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Reference information
Term descriptions
QUALITY OF WATER – is a characteristic of the composition and properties of water which determine whether the water is fit for specific purposes.
CENTRALIZED WATER SUPPLY is the system which supplies the population with water through water supply systems и предназначенной для потребления в питьевых и бытовых целях.
NONCENTRALIZED WATER SUPPLY - использование жителями населенных мест подземных источников водоснабжения для удовлетворения питьевых и хозяйственных нужд при помощи водозаборных устройств без разводящей сети.
NON-CENTRALIZED WATER SUPPLY is the system which supplies population with water using ground water supply sources without a water intake. The water is generally used to meet the needs of the population for drinking water and agricultural needs. The main source of a noncentralized water supply system is ground water which is obtained by means of using special equipment (e.g. water bore wells and tubular wells).
Hygienic requirements and standards imposed on the quality of water from centralized water supply
Table 1
Microbiological and parasitological indicators
| Indicator | Unit | Norm |
| Thermoduric coliform bacteria | Amount of bacteria in 100 ml of water | None bacteria |
| Common coliform bacteria | Amount of bacteria in 100 ml of water | None bacteria |
| Microbe value | Number of colony-forming bacteria in 1 ml | No more than 50 |
| Cysts of lamblia | Number of cysts in 50 l of water | None bacteria |
Table 2
General indicators and pollution rate
| Indicator | Unit | Norm (no more than) | Hazard degree indicator | Degree of severity |
| General indicators | ||||
| Hydrogen (H) | PH | 6-9 | - | - |
| General mineralization | mg/l | 1000 (1500) | - | - |
| General hardness of water | mole/l | 7.0 (10) | - | - |
| Permanganate water oxidizability | mg/l | 5.0 | - | - |
| Inorganic substances | ||||
| Nitrates (NO3) | mg/l | |||
| Iron (Fe) | mg/l | 0, 3 (1, 0) | ||
| Sulfates (So4) | mg/l | |||
| Chloride (Cl) | mg/l | |||
| Lead (Pb) | mg/l | 0, 03 | ||
| Fluoride (for climatic regions) 1-2 | mg/l mg/l | 1, 5 1, 2 |
Table 3
Organoleptic properties
| Indicator | Unit | Norm |
| Smell | Points | No more than 2 |
| Taste | Points | No more than 2 |
| Colour | Degrees | No more than 20 (35) |
| Turbidity | mg/l | No more than 1, 5 (2) |
| Turbidity | mg/l (according to kaolin/china clay) | No more than 2 |
Table 4
Radiation safety
| Hazardous factor | Unit | Norm | Indicator |
| General α -radioactivity | Bq/l | 0, 1 | Radiation |
| General β -radioactivity | Bq/l | 1, 0 | Radiation |
Table 5