Indah Water

Desludging Service

Desludging Service

Effective 1 January 2008, IWK is not responsible for providing scheduled desludging service of septic tanks. Under the Water Services Industry Act 2006, owners of premises with septic tanks are responsible for the maintenance of the septic tanks.

The maximum volume of sludge that a septic tank can store is approximately one third of its total volume. Regular desludging or removal of the accumulated sludge in the tank is critical to prevent water pollution. The frequency of desludging is dependent on the capacity and design of the septic tank. Septic tanks designed according to Malaysian Standards (MS 1228) need to be desludged regularly at least once every two years.

Under section 65(1) of the WSIA 2006, the owner, management corporation or occupier of any premises having a septic tank shall :-  

  • grant the service licensee or permit holder adequate access to the septic tank for the purpose of enabling the septic tank to be serviced and desludged;
  • cause the septic tank and all accessories thereto to be so maintained and kept as not to be a nuisance or harmful to health;
  • cause the septic tank to be desludged by a service licensee or permit holder at such intervals and in such manner as may be prescribed.
  • Seksyen 65 (3) A person who contravenes subsection (1) commits an offence and shall, on conviction, be liable to a fine not exceeding fifty thousand ringgit (RM 50,000).


Customer is required to pay for the desludging service provided by a licensed contractor or IWK.


To facilitate desludging works, please ensure:

1. Clear access for desludging tanker & equipment to enter the premises & the septic tank on the agreed date.

2. No obstacles, such as flower pots, gas cylinder, cabinet, car and heavy objects; over the septic tank.

3. Septic tank cover can easily be opened without force. If the cover is sealed, cemented or covered with floor tiles, please engage a private contractor to unseal the septic tank cover.


Why is Scheduled Desludging Important?

Without scheduled desludging, untreated sewage and sludge solids will be released into rivers. This will cause depletion of dissolved oxygen in these rivers, resulting in the death of aquatic life. The large quantities of sludge that settle to the bottom of rivers will also kill off any aquatic plants that contribute oxygen to the rivers. This will cause our rivers to eventually 'die'. In addition, untreated sewage also poses a threat to public health since it may contain pathogenic bacteria and viruses that cause deadly diseases such as cholera, typhoid and hepatitis A.
All septic tanks need to be desludged on a regular basis, that is once in two years.

For more information,please contact IWK Customer Service Centres


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