Survey on urban wastewater

Statistical Office of the Republic of Serbia

Environmental statistics unit

Neda Cukavac

Statistician-analyst

5 Milana Rakica st. Belgrade, Serbia

neda.cukavac@stat.gov.rs

+381 113290242

Not applicable.

Survey on urban wastewater provide the data on:

• Quantities of wastewater discharged in the recipient

• Quantities of discharged treated and untreated wastewater

• Devices for wastewater treatment

• Biological and chemical oxygen demand

   • Sewerage system/ network.

Code list of watercourses

Classification of Activities (CA – 2010, “Official Gazette of RS”, No 54/10)

Regulation on Nomenclature of Statistical territorial Units (“Official Gazette of RS”, No 109/09 and 46/10)

Survey includes according to Classification of Activities (CA 2010) division 37 – Sewerage and division 84 – Public administration and defence, compulsory social security (local communities’ authorities managing water supply systems).

Public sewerage system (network) is a set of technical – sanitary facilities and measures that provide continuous and systematic collection, drainage, treatment and discharge of wastewaters and atmospheric waters away from settlements and economy into appropriate recipients.

Length of collecting network is the length of the sewerage network system of closed street canals, i.e. pipes for carrying wastewaters and atmospheric waters away from settlements, without household connections and network.

Wastewaters are the quantities of water which, after being used, are carried to the treatment plant or are discharged in underground or surface waters. Atmospheric water is included in the quantities of wastewater. The quantities of wastewater are measured by water meters or are estimated according to defined standards of production.

Wastewater treatment means removal of hazardous and harmful constituents and radio-nuclides from water thus making it harmless for use.

Main collector is the collecting wastewater canal that drains wastewater to the treatment plant or recipient.

One population equivalent (P.E.) means the organic biodegradable load having a five-day biochemical oxygen demand (BOD5) of 60 g of oxygen per a day.

Effluent from wastewater treatment plant is water discharged after wastewater treatment.

Statistical units are local units and enteties who in the reference year are classified according to Classification of Activities (CA 2010) in divisions: 37 – Sewerage and 84 – Public administration and defence, compulsory social security (local communities’ authorities managing water supply systems).

Survey covers observation units which discharge and treat wastewater on the whole territory of the Republic of Serbia. 

The data are representative for the territory of the Republic of Serbia, to level of municipalities. 

Starting from 1999 the Statistical Office of the Republic of Serbia has not at disposal and may not provide available certain data relative to AP Kosovo and Metohija and therefore these data are not included in the coverage for the Republic of Serbia (total).

2000-2016

Not applicable.

Mil. m³, km, number

Calendar year.

The survey is conducted on the basis of the Law on Official Statistics ("Official Gazette of the Republic of Serbia" No. 104/09), according to the Plan and Program of Statistical Surveys and 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

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

Law on Official Statistics („Official Gazette of RS“, No 104/2009), chapter IX

Data are published at the aggregated level.

Notification about dissemination of statistical data are published in Publication calendar which is available on web site.

http://webrzs.stat.gov.rs/WebSite/Public/CalendarView.aspx?pKey=37&cType=1

All users have been granted an equal access to official statistics: this means that the dissemination dates of official statistics have to be announced in advance and no user can have access to the official statistics (results of official statistical surveys) before other users. Statistical information is first published in Statistical Release. Official statistics are available on the website on the date announced in the release calendar.

Annual.

Not applicable.

• Statistics Yearbook
• Statistical Pocket-book
• Eco-bulletin
• Statistical Release Urban wastewater
• Municipalities and regions of the Republic of Serbia 
• Website: www.stat.gov.rs

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

Not applicable.

Not applicable.

On the web site of the Statistical Office of the Republic of Seriba short methodology is available for  Survey on urban wastewater. 

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

The Quality Policy document is available on the SORS website:

http://www.stat.gov.rs/en-US/o-nama/sistem-upravljanja-kvalitetom

High.

The main users of the statistical surveys on Urban wastewater are:

- National users: Ministry of Agriculture and environmental protection, industrial and business associations, environmental associations, NGO's, local municipalities.

- International users: Eurostat, UN, European Agency for environmental protection.

User satisfaction is not conducted yet.

Not applicable.

The overall accuracy is good. Response rate of the survey on urban wastewater is 99%.

Not applicable.

Not applicable.

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

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.

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

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

Not applicable.

Not applicable.

Not applicable.

The audit policy is carried out in accordance with the General Policy of the Audit of the Statistical Office of the Republic of Serbia (Chapter 3 - Audit Policy).

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

Тhe source of data are a statistical survey on urban wastewater.

A methodological instrument which are used for carrying out the survey - Questionnaire Annual survey оn Urban wastewater (VOD-2k). 

Data are collected annualy. 

Data collection is done by the reporting method, meaning that the reporting unit uses its available documentation and records to fill in the paper or web questionnaires. The competent person enters the requested data in the first quarter of the current year for the previous year. If related records are non-existent for certain data, competent persons will make an evaluation. The reporting unit forwards the questionnaire to the relevant statistical authority on which territory its head office is located within the deadline set up in the annual plan.

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

Not applicable.

Not applicable.