Hygienic standard for drinking water
1 Scope
This document specifies the requirements for drinking water quality, drinking water source quality, centralized water supply unit sanitation, secondary water supply sanitation, product sanitation related to drinking water sanitation and safety, and water quality inspection methods.
This document is applicable to all kinds of domestic drinking water.
2 Normative References
The contents in the following documents, through normative references, constitute indispensable provisions of this document. Where, for dated references, only the version corresponding to that date applies to this document; For undated references, the latest version (including all amendments) is applicable to this document.
GB 3838 Environmental Quality Standard for Surface Water
GB/T 5750.1 ～ GB/T 5750.13 Standard Test Method for Drinking Water
GB/T 14848-2017 Quality Standard for Groundwater
GB 17051 Sanitary Code for Secondary Water Supply Facilities
GB/T 17218-1998 Hygienic Safety Evaluation of Chemical Treatment Agents for Drinking Water
GB/T 17219-1998 Standard for Safety Evaluation of Drinking Water Transmission and Distribution Equipment and Protective Materials
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Drinking water
Drinking water and water for human life.
3.2
Centralized water supply
It refers to the water supply mode that water is collected from the water source and delivered to users or public water intake points through the water transmission and distribution pipe network.
3.3
Small centralized water supply
The designed daily water supply is 1000m ³ Centralized water supply with water supply population below 10000.
3.4
Decentralized water supply
The water supply mode in which users directly take water from the water source without any treatment or only with simple facilities.
3.5
Finished water
The water that will enter the water transmission and distribution pipe network after the centralized water supply unit completes the treatment process.
3.6
Tap water
The factory water is delivered to the user's tap through the water transmission and distribution pipe network.
GB 5749—2022
3.7
Regular indicators
Indicators reflecting the basic status of drinking water quality.
3.8
Expanded indicators
Indicators reflecting the quality characteristics of regional drinking water and the water quality in a certain period of time or under special circumstances.
4 Requirements for quality of drinking water
4.1 The quality of domestic drinking water shall meet the following basic requirements to ensure users' drinking safety a) The domestic drinking water shall not contain pathogenic microorganisms,
b) Chemicals in drinking water shall not endanger human health;
c) The radioactive substances in drinking water shall not endanger human health;
d) The sensory properties of drinking water are good;
e) Drinking water shall be disinfected.
4.2 The quality of domestic storage water shall meet the requirements in Table 1 and Table 3. The limit value of disinfectant and disinfection allowance in effluent and end water shall meet the requirements in Table 2.
Note: When the main live drinking water contains the index listed in the financial column in the appendix, the limit value evaluation of the index in the table can be referred to
Table 1 Routine Indicators and Limits of Drinking Water Quality
Serial No index Straightness limiting
1、 Microbial indicators
1 Total coliform (MPN/100 mL or F7710mL) Should not be detected
2 Escherichia coli (M PN7100mL or CFU7100mL Should not be detected
3 Total bacterial count (MPN L or CFU/mL) b 100
2、 Toxicological index
4 砷/(mg/L) 0.01
5 镉/(mg/L) 0.005
6 Chromium (VI)/(mg/L) 0.05
7 铅/(mg/L) 0.01
8 汞/(mg/L) 0.001
9 Cyanide/(mg/L) 0.05
10 Fluoride/(mg/L) b 1.0
11 Nitrate (in N)/(mg/L) b 10
12 Trichloromethane/(mg/L) ° 0.06
13 Dichlorodibromomethane/(mg/L) ° 0.1
GB 5749—2022
Table 1 Routine Indicators and Limits of Drinking Water Quality (Continued)
Serial No index Limits
14 Dichloromonobromomethane/(mg/L) ° 0.06
15 Tribromomethane/(mg/L)* 0.1
16 Trihalomethanes (sum of trichloromethane, monochlorodibromomethane, dichlorobromomethane and tribromomethane) Various compounds in this class
Of measured concentration and their respective limits
The sum of the ratios does not exceed 1
17 Dichloroacetic acid/(mg/L)* 0.05
18 Trichloroacetic acid/(mg/L)* 0.1
19 Bromate/(mg/L) ° 0.01
20 Chlorite/(mg/L) ° 0.7
21 Chlorate/(mg/L) 0.7
3、 Sensory properties and general chemical indexes d
22 Chroma (Pt Co Chroma Unit)/degree 15
23 Turbidity (scattering turbidity unit)/NTUB 1
24 Smell and taste No peculiar smell
25 Visible nothing
26 pH Not less than 6.5 and not more than 8.5
27 铝/(mg/L) 0.2
28 铁/(mg/L) 0.3
29 锰/(mg/L) 0.1
30 铜/(mg/L) 1.0
31 锌/(mg/L) 1.0
32 Chloride/(mg/L) 250
33 Sulfate/(mg/L) 250
34 Total dissolved solids/(mg/L) 1000
35 Total hardness (calculated by CaCO3)/(mg/L) 450
36 Permanganate index (calculated by O2)/(mg/L) 3
37 Ammonia (in N)/(mg/L) 0.5
4、 Radioactivity index °
38 total α Radioactivity/(Bg/L) 0.5 (guide value)
GB 5749—2022
Table 1 Routine Indicators and Limits of Drinking Water Quality (Continued)
Serial No index Limits
39 total β Radioactivity/(Bq/L) 1 (guideline value)
MPN stands for the most probable number; CFU stands for colony forming unit. When the total coliform group is detected in the water sample, further examination of Escherichia coli shall be conducted; When the total coliform group is not detected in the water sample, it is not necessary to detect Escherichia coli.
When small-scale centralized water supply and decentralized water supply are limited by water source and water purification technology, the limit value of total bacterial count index shall be 500 MPN/mL or 500 CFU/mL, the limit value of fluoride index shall be 1.2 mg/L, the limit value of nitrate (in N) index shall be 20 mg/L, and the limit value of turbidity index shall be 3 NTU.
Pre oxidation or disinfection methods in water treatment process:
——When liquid chlorine, calcium hypochlorite and chloramine are used, chloromethane, chloromonobromomethane, dichlorobromomethane, tribromomethane, trihalomethane, dichloroacetic acid and trichloroacetic acid shall be determined
——When sodium hypochlorite is used, trichloromethane, dichlorodibromomethane, dichlorodibromomethane, trimethane, halomethanes, dichloroacetic acid, trichloroacetic acid and chlorate should be determined;
——When ozone is used, bromate should be determined;
- When chlorine dioxide is used, the chlorite shall be determined,
If chlorine dioxide and chlorine are used to disinfect the section generator, the chlorite, nitrogen segment salt, trichloromethane, monobromomethane, dichloro monobromomethane, trioxane, chloro acid and clominic acid should be determined,
When the raw water contains the above pollutants, which may lead to the risk of exceeding the standard of finished water and peripheral water, no matter what pre oxidation or disinfection methods are used, they should be measured.
D In case of heavy articles affecting the water quality, the sensory properties and general chemical indicators can be temporarily relaxed according to the risk assessment.
: If the radioactivity index exceeds the guidance value (the radioactivity is still greater than Bq/L after deducting K), the radionuclide analysis and evaluation shall be carried out to determine whether it can be drunk.
Table 2 Routine Indexes and Requirements of Disinfectants for Drinking Water
Serial No index Contact time with water min Outlet water and end water limit/(mg/L) Water supply margin
(mg/L) End water allowance/
(mg/L)
40 Free chlorine; ≥30 ≤2 ≥0.3 ≥0.05
41 Total Chlorine 5 ≥120 ≤3 ≥0.5 ≥0.05
42
Ozone °
≥12
≤0.3 ≥0.02
If other collaborative disinfectors are used
Formula, disinfectant limit and allowance
It shall meet corresponding requirements
43 Chlorine dioxide· ≥30 ≤0.8 ≥0.1 ≥0.02
When liquid chlorine, sodium hypochlorite and calcium hypochlorite are used for disinfection, free chlorine shall be determined.
B When chloramine disinfection method is adopted, the total chlorine shall be determined.
When ozone disinfection is used, ozone shall be determined.
4 When chlorine dioxide disinfection method is adopted, chlorine dioxide shall be determined; When chlorine dioxide and chlorine mixed disinfectant generator are used for disinfection, chlorine dioxide and free chlorine shall be determined. Both indicators shall meet the limit requirements, and at least one indicator shall meet the margin requirements.
Standard
GB/T 41158.4-2022 Three-dimensional process planning for mechanical products—Part 4：Process symbol and annotation (English Version)
Standard No.
GB/T 41158.4-2022
Status
valid
Language
English
File Format
PDF
Word Count
25000 words
Price(USD)
750.0
Implemented on
2022-10-1
Delivery
via email in 1~5 business day
Detail of GB/T 41158.4-2022
Standard No.
GB/T 41158.4-2022
English Name
Three-dimensional process planning for mechanical products—Part 4：Process symbol and annotation
Hygienic standard for drinking water
1 Scope
This document specifies the requirements for drinking water quality, drinking water source quality, centralized water supply unit sanitation, secondary water supply sanitation, product sanitation related to drinking water sanitation and safety, and water quality inspection methods.
This document is applicable to all kinds of domestic drinking water.
2 Normative References
The contents in the following documents, through normative references, constitute indispensable provisions of this document. Where, for dated references, only the version corresponding to that date applies to this document; For undated references, the latest version (including all amendments) is applicable to this document.
GB 3838 Environmental Quality Standard for Surface Water
GB/T 5750.1 ～ GB/T 5750.13 Standard Test Method for Drinking Water
GB/T 14848-2017 Quality Standard for Groundwater
GB 17051 Sanitary Code for Secondary Water Supply Facilities
GB/T 17218-1998 Hygienic Safety Evaluation of Chemical Treatment Agents for Drinking Water
GB/T 17219-1998 Standard for Safety Evaluation of Drinking Water Transmission and Distribution Equipment and Protective Materials
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Drinking water
Drinking water and water for human life.
3.2
Centralized water supply
It refers to the water supply mode that water is collected from the water source and delivered to users or public water intake points through the water transmission and distribution pipe network.
3.3
Small centralized water supply
The designed daily water supply is 1000m ³ Centralized water supply with water supply population below 10000.
3.4
Decentralized water supply
The water supply mode in which users directly take water from the water source without any treatment or only with simple facilities.
3.5
Finished water
The water that will enter the water transmission and distribution pipe network after the centralized water supply unit completes the treatment process.
3.6
Tap water
The factory water is delivered to the user's tap through the water transmission and distribution pipe network.
GB 5749—2022
3.7
Regular indicators
Indicators reflecting the basic status of drinking water quality.
3.8
Expanded indicators
Indicators reflecting the quality characteristics of regional drinking water and the water quality in a certain period of time or under special circumstances.
4 Requirements for quality of drinking water
4.1 The quality of domestic drinking water shall meet the following basic requirements to ensure users' drinking safety a) The domestic drinking water shall not contain pathogenic microorganisms,
b) Chemicals in drinking water shall not endanger human health;
c) The radioactive substances in drinking water shall not endanger human health;
d) The sensory properties of drinking water are good;
e) Drinking water shall be disinfected.
4.2 The quality of domestic storage water shall meet the requirements in Table 1 and Table 3. The limit value of disinfectant and disinfection allowance in effluent and end water shall meet the requirements in Table 2.
Note: When the main live drinking water contains the index listed in the financial column in the appendix, the limit value evaluation of the index in the table can be referred to
Table 1 Routine Indicators and Limits of Drinking Water Quality
Serial No index Straightness limiting
1、 Microbial indicators
1 Total coliform (MPN/100 mL or F7710mL) Should not be detected
2 Escherichia coli (M PN7100mL or CFU7100mL Should not be detected
3 Total bacterial count (MPN L or CFU/mL) b 100
2、 Toxicological index
4 砷/(mg/L) 0.01
5 镉/(mg/L) 0.005
6 Chromium (VI)/(mg/L) 0.05
7 铅/(mg/L) 0.01
8 汞/(mg/L) 0.001
9 Cyanide/(mg/L) 0.05
10 Fluoride/(mg/L) b 1.0
11 Nitrate (in N)/(mg/L) b 10
12 Trichloromethane/(mg/L) ° 0.06
13 Dichlorodibromomethane/(mg/L) ° 0.1
GB 5749—2022
Table 1 Routine Indicators and Limits of Drinking Water Quality (Continued)
Serial No index Limits
14 Dichloromonobromomethane/(mg/L) ° 0.06
15 Tribromomethane/(mg/L)* 0.1
16 Trihalomethanes (sum of trichloromethane, monochlorodibromomethane, dichlorobromomethane and tribromomethane) Various compounds in this class
Of measured concentration and their respective limits
The sum of the ratios does not exceed 1
17 Dichloroacetic acid/(mg/L)* 0.05
18 Trichloroacetic acid/(mg/L)* 0.1
19 Bromate/(mg/L) ° 0.01
20 Chlorite/(mg/L) ° 0.7
21 Chlorate/(mg/L) 0.7
3、 Sensory properties and general chemical indexes d
22 Chroma (Pt Co Chroma Unit)/degree 15
23 Turbidity (scattering turbidity unit)/NTUB 1
24 Smell and taste No peculiar smell
25 Visible nothing
26 pH Not less than 6.5 and not more than 8.5
27 铝/(mg/L) 0.2
28 铁/(mg/L) 0.3
29 锰/(mg/L) 0.1
30 铜/(mg/L) 1.0
31 锌/(mg/L) 1.0
32 Chloride/(mg/L) 250
33 Sulfate/(mg/L) 250
34 Total dissolved solids/(mg/L) 1000
35 Total hardness (calculated by CaCO3)/(mg/L) 450
36 Permanganate index (calculated by O2)/(mg/L) 3
37 Ammonia (in N)/(mg/L) 0.5
4、 Radioactivity index °
38 total α Radioactivity/(Bg/L) 0.5 (guide value)
GB 5749—2022
Table 1 Routine Indicators and Limits of Drinking Water Quality (Continued)
Serial No index Limits
39 total β Radioactivity/(Bq/L) 1 (guideline value)
MPN stands for the most probable number; CFU stands for colony forming unit. When the total coliform group is detected in the water sample, further examination of Escherichia coli shall be conducted; When the total coliform group is not detected in the water sample, it is not necessary to detect Escherichia coli.
When small-scale centralized water supply and decentralized water supply are limited by water source and water purification technology, the limit value of total bacterial count index shall be 500 MPN/mL or 500 CFU/mL, the limit value of fluoride index shall be 1.2 mg/L, the limit value of nitrate (in N) index shall be 20 mg/L, and the limit value of turbidity index shall be 3 NTU.
Pre oxidation or disinfection methods in water treatment process:
——When liquid chlorine, calcium hypochlorite and chloramine are used, chloromethane, chloromonobromomethane, dichlorobromomethane, tribromomethane, trihalomethane, dichloroacetic acid and trichloroacetic acid shall be determined
——When sodium hypochlorite is used, trichloromethane, dichlorodibromomethane, dichlorodibromomethane, trimethane, halomethanes, dichloroacetic acid, trichloroacetic acid and chlorate should be determined;
——When ozone is used, bromate should be determined;
- When chlorine dioxide is used, the chlorite shall be determined,
If chlorine dioxide and chlorine are used to disinfect the section generator, the chlorite, nitrogen segment salt, trichloromethane, monobromomethane, dichloro monobromomethane, trioxane, chloro acid and clominic acid should be determined,
When the raw water contains the above pollutants, which may lead to the risk of exceeding the standard of finished water and peripheral water, no matter what pre oxidation or disinfection methods are used, they should be measured.
D In case of heavy articles affecting the water quality, the sensory properties and general chemical indicators can be temporarily relaxed according to the risk assessment.
: If the radioactivity index exceeds the guidance value (the radioactivity is still greater than Bq/L after deducting K), the radionuclide analysis and evaluation shall be carried out to determine whether it can be drunk.
Table 2 Routine Indexes and Requirements of Disinfectants for Drinking Water
Serial No index Contact time with water min Outlet water and end water limit/(mg/L) Water supply margin
(mg/L) End water allowance/
(mg/L)
40 Free chlorine; ≥30 ≤2 ≥0.3 ≥0.05
41 Total Chlorine 5 ≥120 ≤3 ≥0.5 ≥0.05
42
Ozone °
≥12
≤0.3 ≥0.02
If other collaborative disinfectors are used
Formula, disinfectant limit and allowance
It shall meet corresponding requirements
43 Chlorine dioxide· ≥30 ≤0.8 ≥0.1 ≥0.02
When liquid chlorine, sodium hypochlorite and calcium hypochlorite are used for disinfection, free chlorine shall be determined.
B When chloramine disinfection method is adopted, the total chlorine shall be determined.
When ozone disinfection is used, ozone shall be determined.
4 When chlorine dioxide disinfection method is adopted, chlorine dioxide shall be determined; When chlorine dioxide and chlorine mixed disinfectant generator are used for disinfection, chlorine dioxide and free chlorine shall be determined. Both indicators shall meet the limit requirements, and at least one indicator shall meet the margin requirements.
