Septic tank systems Unsewered properties within the City of Kalgoorlie-Boulder require septic tanks to treat and dispose of sewage and wastewater. Decommissioning a septic tank system
Constructing a septic tank system Depending on the development, approval to construct a septic system must sought from either: The City’s Environmental Health Services will advise you whom to seek approval from.
Please download and complete the Washdown Bay fact sheet and application which must be accompanied by:
Please note: Approval to construct a septic tank system is separate from approval to use the system.
Two sets of detailed plans (1:100 or 1:200 scales only)
Information on plan drawings, submissions and approval process
Fees and payments
In order to receive approval to use the system, the City must conduct an inspection to ensure it is installed correctly.
If a property is connected to the sewer system, the disused septic tank system can be decommissioned. Owners are not required to have the disused system decommissioned at the time of sewer connection.Greywater
Decommissioning is only required when: Decommissioning involves pumping the contents out of the tanks and removing the entire system, where possible.
If it is not possible to remove the whole system, then the base of the septic tanks must be broken and the entire system backfilled with clean soil.
For more information download the Decommissioning of a Septic Tank fact sheet
Greywater refers to all non-toilet household wastewater. It can be reused in domestic settings, especially during periods of drought or water restrictions. Doing so has some health and environmental risks.Evaporative Air Conditioning Bleed-off
The following tips will improve the health and safety of greywater reuse:
Do not use greywater:
Only reuse water from baths, showers, hand basins and washing machines (final rinse)
Only use greywater on gardens, and rotate the areas you water
Only use as much water as the soil can absorb
Thoroughly wash your hands after using greywater
During wet periods
If odours are produced and plants appear unhealthy
To water vegetable that are to be eaten raw or uncooked
That is contaminated—for example, water used to wash nappies
From the kitchen (including dishwashers)—the high concentration of food waste and chemicals are not readily broken down in soil
That has been stored for more than 24 hours
If you wish to put in a permanent system for greywater reuse, you will need to apply to the City of Kalgoorlie-Boulder for approval.
For information on evaporative air conditioners, download our Evaporative Air Conditioning Fact Sheet.More Information
The WA Department of Health website contains information on wastewater management, including: