About Us


We intend to increase the number of improved sanitation systems and services through an output-based approach among low income households in greater Colombo. Improved access to sanitation services should result in improved health and environmental conditions for the population living in targeted areas, by ensuring that domestic wastewater is effectively managed and appropriately disposed of. This will be accomplished through new connections to networked centralized or decentralized sewerage, and improved on-site sanitation in partnership with municipalities as well. The effort will be taken by the National Water Supply and Drainage Board (NWSDB), with the vision to be the most prestigious utility supplier in Sri Lanka.

Our objective extends to pilot OBA (Output Based Aid) as an efficient mechanism for delivery of improved sanitation services to low income households.

Project Outputs

The key proposed technical options, or so-called “outputs,” on which OBA subsidies will be disbursed to NWSDB are:

  • Output 1: new household connections to piped sewerage.
  • Output 2: improvements to the performance and operation of on-site sanitation systems and services, through the construction or rehabilitation of on-site septic tank and soakage pits/trenches, including other sanitation facilities and regulate desludging services.

The determination of the specific output that will be provided to a household will depend on the technical feasibility and proximity of existing NWSDB-managed sewer networks. Output 1 is further delineated into sub-outputs. The various outputs and sub-outputs are described in detail below:

Output 1a: “Direct connections” :Direct connections for households located close to (within about 20m of)an existing sewerage network. “Direct connections” are devided into two categories:

  • Output 1a1: “Direct connection full cost build out” encompasses all infrastructure from all gray and black water outputs of the house to the sewerage network located under the nearest road; and
  • Output 1a2: “Direct connection within premises” is limited to the infrastructure developed on the premises of the beneficiary household.

Output 1b: “Connections to conventional sewer extensions”: Extensions with conventional sewer technology for households located more than 20m from the main sewerage network.

Output 1c: “Connections to simplified sewer extensions”: Extensions with simplified sewer (also called shallow sewer or condominial sewer) and connections for households located more than 20m from the main sewerage network. The “connections to simplified sewer extensions” are organized in two categories:

  • Output 1c1: “Connections to simplified sewer extensions”: Gravity fed connections to simplified sewer extensions; and
  • Output 1c2: “Connections to simplified sewer extensions with pumping”: connections to simplified sewer connections requiring wastewater pumping to feed it into the main sewerage network.

Output 1d: “Connections to decentralized networks”: Connections to new stand-alone sewerage networks with decentralized wastewater treatment (“Dewat”). This output will be offered to households located in areas where sewerage is technically feasible, but too far from the existing, central sewerage network to make an extension a viable economic option.

Output 2: “On-site sanitation improvements”: In areas where sewers cannot be provided or are not appropriate, eligible households will be offered “on-site sanitation improvements”. This output consists in combining building a new facility where the household does not have one, or rehabilitating the households’ existing on-site sanitation facility. For both options, the output includes the provision of regular desludging services by a licensed gully bowser company, contracted through performance-based contracts. The introduction of performance-based contracts will promote the introduction of a new way of managing on-site sanitation.

Project Beneficiaries

About 8,800 households are expected to benefit from access to improved sanitation, through one of the proposed outputs. These households are located in low-income areas of Ja-Ela / Ekala, Ratmalana, Moratuwa, Kolonnawa, and Dehiwela / Mount Lavinia, identified by NWSDB and Divisional Secretaries and validated by the Project Steering Committee.

Estimated number of beneficiary households per project area.

Source of Funds: GOSL, World Bank (GPOBA), NWSDB, Beneficiary
Original Project Period: June 2012-December 2015
Revised Project Period: June 2012 – December 2017
Grant Effective Date: 13.06.2012
Grant Closing Date: 31.12.2017

TEC: Foreign Component 733 Mn
Local Component 1143 Mn

Overall Project Progress

Overall Financial Target: 85.7%
Overall Physical Target: 97.9%
Overall Financial Progress: 56.8%
Overall Physical Progress: 87.9%