Survey on water balance on inland waters

Period: Annual
Year: 2019

01. Contact
02. Metadata update
03. Statistical presentation
04. Unit of measure
05. Reference Period
06. Institutional Mandate
07. Confidentiality
08. Release policy
09. Frequency of dissemination
10. Accessibility and clarity
11. Quality management
12. Relevance
13. Accuracy and reliability
14. Timeliness and punctuality
15. Coherence and comparability
16. Cost and Burden
17. Data revision
18. Statistical processing
19. Comment

01. ContactTop
01.1. Contact organisation

Statistical Office of the Republic of Serbia

01.2. Contact organisation unit

Division for environmetal statistics and accounts

01.3. Contact name

Ana Vignjević

01.4. Contact person function

Senior Statistician

01.5. Contact mail address

Milana Rakića 5

01.6. Contact email address

01.7. Contact phone number

+381 11 2412 922 ext. 399

01.8. Contact fax number

Not applicable.

02. Metadata updateTop
02.1. Metadata last certified
02.2. Metadata last posted
02.3. Metadata last update

03. Statistical presentationTop
03.1. Data description

Survey on total water balace contains data on the quantities of total abstracted, used and wastewater in all sectors of Classification of Activity as well as for households.

The survey contains data on: 

  • Abstracted water quantities by supply sources: from self supply, from public water supply and water losses
  • Use of water for irrigation, for livestock, for aquaculture, for industry (cooling, in hydroelectric power plants, production process, as well as sanitary waters and their use for other purposes), for construction, for households, for service activities; ·
  • The total wastewater discharges, both untreated and treated by primary, secondary or tertiary treatment, discharged other types of waters (rainwater, water from the mine, etc.).
03.2. Classification system

For the purpose of the survey is applied:

  • Classification of Activities (CA-2010, “Official gazette of RS”, No 54/10)
03.3. Coverage - sector

Survey includes all sections that are defined in surveys on water statistics.

03.4. Statistical concepts and definitions

Underground water relates to water stocks beneath the land surface.

Surface water refers to all running or stagnant waters on the surface of the Earth found in streams, rivers (watercourses), lakes, accumulations, etc, as well as in artificial waterways for the purpose of irrigation, creation of navigation canals, etc.

Own water abstraction source means any water abstraction by the user for its end-use consumption.

Water use refers to all the quantities of water supplied to the reporting units during the reference year for the purpose of undertaking their production activities.

Wastewaters are waters which are, after being used, transported to the treatment plant or let out in a water body (underground, surface waters). Atmospheric waters, flowing waters used in hydropower plants and cooling water are excluded.

Treated wastewaters are quantities of wastewaters treated during the reference year.

Primary treatment of wastewaters by physical and/or chemical procedure includes the collection of suspended particles, and other processes in which BOD is reduced by at least 20% before being discharged. It also covers the total suspended particles of incoming wastewaters reduced to by least 50%.

Secondary treatment of wastewaters includes biological treatment with secondary collection or by other by other processes, which result in COD reduction of at least 70% and COD reduction of at least 75%.

Tertiary treatment is the next wastewater treatment process after the secondary treatment of nitrogen and/or phosphorous and/or any other pollutant affecting the quality and specific use of water: organic pollution reduced up to at least 95% for BOD and 85% for COD, being: at least 70% nitrogen removal, at least 80% phosphorous removal and microbiological removal until a coliform density of 1000 in 100 ml is reached.

03.5. Statistical unit

Statistical units are local units that are defined in statistical water surveys from which data are taken.

03.6. Statistical population

The statistical population is defined in the statistical water surveys from which the data are taken.

03.7. Reference area

Republic of Serbia 

Note: Since 1999, the Statistical Office of the Republic of Serbia is not responsible for certain data for the Autonomous Province of Kosovo and Metohija, so that they are not included in the coverage of the Republic of Serbia data (total).


03.8. Coverage - Time


03.9. Base period

Not applicable.

04. Unit of measureTop
04. Unit of measure

The data are published in millions of cubic meters.

05. Reference PeriodTop
05. Reference Period


06. Institutional MandateTop
06.1. Institutional Mandate - legal acts and other agreements

National legislation:

- Official Statistics Law
- Resolution on the Programme of official statistics
- Regulation on the Plan of official statistics for the current year
* The above documents are available at SORS website:

The survey is conducted аlso according to requirements of „JQ OECD/ Eurostat“(JQ OECD/Eurostat – Inland water), questionnaire for Inland Water and questionnaire UNSD/UNEP – Environmental Statistics (UNSD/UNEP – Environmental statistics.

06.2. Institutional Mandate - data sharing

Data are sended to Eurostat every second year, and these data are published in Eurostat´s data base.

07. Confidentiality Top
07.1. Confidentiality - policy

Data confidentiality is stipulated by:

- Official Statistics Law (Official Gazette of RS, number 104/2009), Articles 44, 45, 46, 47, 48, and 49.


- Rulebook on statistical data protection in the Statistical Office of the Republic of Serbia


- Guidelines on measures of data and information protection in the Statistical Office of the Republic of Serbia

( )


07.2. Confidentiality - data treatment

Data are published at the aggregated level.

08. Release policyTop
08.1. Release calendar
Calendar of releases is available at SORS website on the 1st day of December every year for the forthcoming year (
All SORS releases are launched at 12.00.
Any divergence from the defined time schedule are announced in advance and explained in the Calendar.  


 Annexes :
 Relase calеndar
08.2. Release calendar access

Calendar of releases is available at SORS website:


 Annexes :
 Relase calеndar
08.3. Release policy - user access
The data obtained through statistical surveys are released at the internet presentation (,
in statistical releases and publications ( 
The results of official statistics are available at the same time to all users on impartial basis; any privileged access by external users before their release is not allowed.  


09. Frequency of disseminationTop
09. Frequency of dissemination

Dissemination and publication of data is annual.

10. Accessibility and clarityTop
10.1. Dissemination format - News release

Not applicable.

10.2. Dissemination format - Publications
10.3. Dissemination format - online database

The data are available in the database of the Statistical Office of the Republic of Serbia, Division Environment, the subdivision Water.

 Annexes :
 Statstical database - Waters
10.4. Dissemination format - microdata access

Not applicable.

10.5. Dissemination format - other

Not applicable.

10.6. Documentation on methodology

Not applicable.

10.7. Quality management - documentation

SORS describe the sources and methods in the quality report and metadata. A summary of the quality information. At the country level is available on SORS web page (QMC- quality management system).

11. Quality managementTop
11.1. Quality assurance
The SORS quality management system is relied on the Serbian official statistics mission and vision, as well as on the European Statistics Code of Practice – CoP and the Total Quality Management – TQM principles, which together make the common quality framework of the European Statistical System (ESS).
For more information, please see the documents at


11.2. Quality management - assessment

The questionnaire is filled in complying with all the recommendations and guidelines given in the Filling Instruction. All data are obtained from the statistical reports that the reporting units submit to the Statistical Office of the Republic of Serbia. After detailed analysis and verification, these data can be considered valid and reliable.

12. Relevance Top
12.1. User needs

-           National users: Ministry of Environmental Protection, Republic Hydrometeorological Service of Serbia, Water Directorate, Serbian Environmental Protection Agency,  environmental associations, NGO´s, local municipalities;

-          International users: Eurostat; UN, European Environment Agency (EEA), European Data Centre for Water (WISE).

12.2. User satisfaction

On biennial basis (once in two years), by the means of web interview, implemented is the User Satisfaction Survey. The survey results are available at SORS website:


12.3. Completeness

Not applicable.

13. Accuracy and reliabilityTop
13.1. Overall accuracy

Not applicable.

13.2. Sampling error

Not applicable.

13.3. Non-sampling error

Not applicable.

14. Timeliness and punctualityTop
14.1. Timeliness

The data are available in the 12th month of the end of the reporting year. 

14.2. Punctuality

Preliminary data are published in accordance with the deadline given in the Regulation on the Plan of official statistics. Final data are published in accordance with the terms announced in the Regulation on the Plan of official statistics and the Release Calendar.

15. Coherence and comparabilityTop
15.1. Comparability - geographical

The application of concepts and definitions from the methodology enables geographical comparability with the data of EU countries.

15.2. Comparability - over time

The time series has been available since 2000 without time brake.

15.3. Coherence - cross domain

Not applicable.

15.4. Coherence - internal

Not applicable.

16. Cost and BurdenTop
16. Cost and Burden

Not available.

17. Data revisionTop
17.1. Data revision - policy
The SORS general revision policy constitutes the global frame ensuring that each statistical domain shall define its own revision policy in compliance with its specific nature. 
The general SORS revision policy determines:
- general rules of revisions of the published data,
- forms of informing users as regards the possible causes of revisions,
- categories of revisions, and
- documents covering all aspects of revisions.
The general SORS revision policy is available at


17.2. Data revision - practice

The published data should be regarded as final, unless otherwise stated. Corrections and revisions might occur.

18. Statistical processingTop
18.1. Source data

For conducting the survey on total water balance are used surveys of statistics of water:

Annual survey on water use and protection against pollution, VOD-1;

Annual survey on drinking water supply, VOD-2v;

Annual survey on urban wastewater, VOD-2k;

Annual survey on irrigation, VOD-4.

In addition, for this survey are used statistician sources of data (statistics of agriculture) and estimation.

18.2. Frequency of data collection

Data are collected annualy. 

18.3. Data collection

Data are obtained from  water statistics surveys from which data are taken.

18.4. Data validation

Validation of data is done during the entire data processing from input to final results.

18.5. Data compilation

Not applicable.

18.6. Adjustment

Not applicable.

19. CommentTop