Decommission a septic system

If you are switching from septic to sewer, or if you are replacing an old septic system, any existing septic tanks must be properly decommissioned.

All septic tank decommissioning works must be completed by a licensed plumber and carried out in accordance with Environment Protection Authority (EPA) guidelines.

Who can carry out the work

  • All decommissioning and removal works must be undertaken by a licensed plumber.
  • Septic tank contents must be pumped out by a licensed sewage sludge contractor.
  • Council does not oversee or supervise decommissioning works.

If you have questions or concerns, please speak with your licensed plumber or contact the Building and Plumbing Commission (formerly VBA).

What happens during decommissioning

If a septic tank is no longer required, it must either be removed from the ground and backfilled, or decommissioned in place.

This process should include: 

1. Pump out the tank contents

  • All contents must be removed by a licensed sewage sludge contractor.
  • Inlet and outlet pipes must be permanently sealed.

2. Collapse the tank

  • Punch a hole in the bottom of the tank.
  • Punch holes in the lids and any parts of the tank walls above ground level so they collapse into the tank.

3. Fill the tank

  • Fill the tank completely with clean earth or sand.

4. Chlorination pits

  • Any chlorination pits on sand filter outlets must also be decommissioned using the same process, as these may have a direct connection to the stormwater drain. 

Notify Council

Once your septic tank has been decommissioned, you must notify Council.

This online form should be completed by the licensed plumber who carried out the works.

Notify Council about a decommissioned septic system

 

 

Contact us

To talk about wastewater and your property call our Environmental Health team on 9433 3340.

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