Newsdetails BORDA Africa

24.11.2016 12:15 Category: News form BORDA Africa
by Laura Bright-Davies, BORDA Africa

Decentralised wastewater solutions for non-sewered areas of Dar es Salaam

Dar es Salaam’s population of over 4 million is expected to more than double within the next ten years. Yet less than 10% of the city is currently connected to a public sewer network, and more than half of the wastewater from these sewer networks is being discharged into the ocean untreated.


The remaining 90% of the population use on-site sanitation options, with the majority of the resulting waste left to soak into the ground or flow into storm-water drains and rivers. This lack of wastewater treatment leads to groundwater contamination, public health risks and environmental degradation. The water authority’s plan to extend  the centralised sewerage network and install advanced treatment plants is expected to increase coverage up to 40% within the next decade. However, the city continues to expand into surrounding areas that lack essential public services.

In response to this situation, UNEP, UN-HABITAT and BORDA-Africa recently commenced a joint project entitled ”Demonstration of decentralised wastewater projects in non-sewered areas of Dar es Salaam”. This project intends to showcase decentralised wastewater projects as suitable solutions for non-sewered areas of Dar es Salaam. These include the large emerging housing developments on the outskirts of the city, where the environmental and public health problems of tomorrow will arise. The project also aims to compile information to support improvement of the associated regulatory framework.The expected outputs from this two-year project (May 2016 – May 2018) include:

  1. Monitoring and evaluation (M&E) of selected treatment technologies conducted – and their social, financial and institutional performance – and baseline data established
  2. Workshops at city level conducted, to disseminate the idea, review the regulatory framework and develop technical standards.
  3. Technical standards and guidelines developed for the application, construction and operation of decentralised wastewater treatment systems.

On July 27, BORDA hosted the first kick-off workshop, with participants from NEMC, EWURA, MoWI, DAWASA, VPO, NGOs , INGOs, IGOs, academic institutions and the private sector. Participants were involved in reviewing existing regulations/standards relating to decentralised sanitation, identifying potential projects for M&E exercises, and discussing approaches for dissemination of technical standards and guidelines.

The expected outputs from this two-year project running from May 2016 to May 2018 encompass monitoring and evaluation (M&E), workshops, and technical standards. In conducting M&E of selected treatment technologies, the project will document their social, financial and institutional performance and establish baseline data. City-level workshops will serve to disseminate the project idea and to provide a forum for reviewing the relevant regulatory framework and developing technical standards. These technical standards and guidelines will then be used in the application, construction and operation of decentralised wastewater systems.

For more information on this project, contact BORDA Project Coordinator, Opens window for sending emailLaura Bright-Davies: