Budapest Complex Integrated Sewerage Project


Technical data

Building trades

traffic engineering
utility design
electrical and mechanical design


Budapest Főváros Főpolgármesteri Hivatal

Project value


Design value

2,093.00 millió Ft

Years of completion


Years of construction

  • Preparation of a water approval design in principle for sewerage in Budapest and obtaining of a water licence in principle. Preparation of water establishment approval designs on the basis of the water licence in principle and obtaining of a water establishment licence.

Major quantities for which water establishment approval designs were prepared:
Sewers lateral: 222,7 km
Principal sewers main: 21,5 km
Sewage lift stations: 19 db

  • Preparation of tender designs containing detailed designs (red book), with unpriced bills of quantities in a breakdown by
    • Tender 1, Parts 1, 2 and 3;
    • Tender 2, Parts 1, 2, 3, 4 and 5.

Quantities stated in the tender designs:
Sewers lateral: 182,9 km
Sewage lift stations: 19 db

  • Preparation of a Preliminary Feasibility Study, an Intermediate Detailed Feasibility Study and a Detailed Feasibility Study for the area of the whole project with the following parts:
  • General information (prepraratory analyses and project types)
  • Technical feasibility, implementation and costs
    • Analysis of alternatives
    • Facilities to be implemented
    • Financial table
    • Exploration and assessment of systems of environmental components and nature and landscape conservation areas; are they affected?
    • Financial feasibility
      • Financial Net Present Value (FNPV)
      • Financial Rate of Return (FRR)
    • Economic and social analysis
      • Cost-Benefit Analysis (CBA)
      • Multi-Criteria Analysis (MCA)
  • Risk analysis and sensitivity analysis
  • Preparation of Environmental Assessment Documentation for the project area
  • Application for the Confirmation of High Project Grant with the following details, in Hungarian and English
  • Content of Grant Application:
    • Results of Feasibility Studies
    • Schedule
    • Cost-benefit analysis
    • Environmental impact assessment
    • Reasons stated for the contribution provided from public funds
    • Financial plan
    • Compatibility with Community policies and law

The Feasibility Study and the Grant Application contain the following major quantities:
Sewers lateral: 217.170 m
Main works components and principal sewers main: 20.454 m

Of the unified sewerage conurbation with Budapest as its centre, the area of the BKISZ Project includes the areas of Budapest (population: 1,721,556) and the recently joined Budaörs (population: 28.894). The tender documentation was prepared for the areas of these two municipalities.
No new sewage treatment plant is established under the BKISZ Project.
No new sewer main is constructed in Budaörs. The existing inefficient sewage treatment plant is not reconstructed, instead, it is shut down, and the sewage coming to the shut-down treatment plan is conveyed to the South Buda collection system of Budapest, and through it, to the Csepel Central Sewage Treatment Plant. Therefore, the previously proposed South Buda Sewage Treatment Plant will not be constructed, because the capacities of the existing North Pest and South Pest treatment plants and the new Central Sewage Treatment Plant are sufficient for treating the sewage produced in the established sewerage conurbation both at present and in the very long term.

Treatment plant Average capacity Treatment capacity Number of inhabitants living in the catchment area Number of new connections
[m3/d] [LE] [persons] [pcs]
North Pest 220,000 775,000 265,639 2,420
South Pest 80,000 293,300 610,747 7,501
Csepel Central 300,000 1,600,000 950,412 4,006
Budaörs 11,270 28,894 -

In Budapest, under the project, the Metropolitan Government of Budapest wished to provide for the sewerage of the existing areas that typically have a residential function in cooperation with the district governments and the town of Budaörs mostly with separate sanitary and storm sewer systems and sewage lift stations integral with them. In compliance with the conditions under Government Decree No. 26/2002 (II.27.), under the programme, sanitary sewers or a sewerage network are constructed only in a built-up residential zone in the inner areas of the town, which contain existing residential properties.

No sewer is constructed as part of preliminary development with services under the project. Furthermore, no sewer is constructed under the project in quarters in the outer areas of the town, in areas falling in non-residential zoning categories, for example, for residential properties located in industrial or recreation zones.

Of the 897,000 homes existing in Budapest in 2011, 852,200 were connected to the sewer system, while 44,800 were not. Of the existing 10,640 homes existing in Budaörs, which belongs to the project area, 9,895 were connected to the sewer system. (No sanitary sewage treatment plant is constructed in the area of Budaörs under the project.)
In Budapest, of the homes registered as not connected to the sewer system, the number of homes located in areas provided with sewerage and probably have their sewage removed in some way (perhaps through an adjacent property) or are connected to the sewer system without registration can be put at 20,000.
Therefore, under the project, 13,927 new building sewers are connected for 19,620 homes that can be economically provided with sewerage.
The number of inhabitants who belong to the direct target group of the project and who are connected to the sewer system through the implementation of the project is 41,792. To provide them with sewerage, the programme envisages the construction of 217,170 m of sewer mains and 14 network lift stations. The programme envisages the construction of 20,454 m of sewers forming the main wastewater network and flow control sewers for the operation of the system and five lift stations for the main wastewater network.