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IT4-P1 Centralised Sewerage Services

IT4-P1 The Percentage of Homes with Centralised Sewerage Services

Measuring the percentage of urban areas that are connected to sewerage services. Connected services include:

Centralized sewerage service - a sewage collection system that includes a network of pipes and centralized sewage treatment plants. A centralized sewerage system is used to collect and treat wastewater from high quantities resulting from a specific catchment area according to the sewerage catchment strategy of the area.

Multipoint Plant - refers to the local sewerage treatment and disposal of sewage collection and treatment system involving a small community. These plants will eventually be rationalized into centralized plants.

Private Plant – refers to plants that have not been handed as public plant to the National Water Services Commission (SPAN) or before 2008, the Sewerage Services Department (SSD).

Individual Septic Tanks ideal for a residence or individual building with a population equivalent (PE) up to 150 which does not have a centralized sewerage system and where effluent discharges will not adversely affect the environment . Sludge can be stored in the tank for 2 years after which it needs to be emptied on a schedule for the tank to operate properly.



Connected sewerage service is important to monitor the effluent quality compared to conventional sewerage system (individual septic tank). Higher percentage of areas that get connected sewerage service is more sustainable.

Data Source
  • Local Authorities

  • National Water Services Commission

A. Total dwelling served by centralized sewerage.
B. Total dwelling in the area during the year


Formula Standards Score Target

IT4 – P1 = ( A / B ) x 100


A =   Total dwelling served by centralized sewerage.

B =   Total dwelling in the area during the year

> 80% (high)

60%-80%  (average)

< 60% (low)