If sewer is not available then you will need a septic system.
Building companies charge a fortune on top of the real price for a septic system. In most cases, conventional septic tank- leach drain systems will be adequate. However some developments require an Aerobic Treatment Unit (ATU) or phosphorus retention system
An Aerobic Treatment Unit (ATU) may be required when:
• Local Government makes it a requirement;
• High volumes of wastewater needs to be treated;
• Site conditions are unfavourable for conventional systems
http://www.public.health.wa.gov.au/cproot/1331/2/approved_aerobic_treatment_units.pdf
Where phosphorus retention is required, you can either:
• Install an ATU and irrigate over an amended soil bed;
• Install an ATU with an alum dosing unit;
• Install an alternative leach drain system that can retain phosphorus.
http://www.public.health.wa.gov.au/cproot/2992/2/Approved%20Alternative%20Leach%20Drains%20120806.pdf
Information on ATU’s
http://www.public.health.wa.gov.au/cpro ... 0Units.pdf
More information on Septic Tank Systems
http://www.public.health.wa.gov.au/cproot/2372/2/Understanding%20Septic%20Tank%20Systems.pdf
Septic System
A four bedroom house requires a systems that has two septic tanks (1520mm & 1220mm) with two 9m leach drains or 4 soakwells. A list of approved systems can be found here. If the lot has heavy clay soils then the leach drains will need to be fully inverted
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http://www.public.health.wa.gov.au/3/1429/2/approved_wastewater_systems.pm
In areas where reticulated sewerage is not available, onsite disposal of wastewater is required. An Application to Construct or Install an Apparatus for the Treatment of Sewage (PDF 257KB) in accordance with the Health (Treatment of Sewage and Disposal of Effluent and Liquid Waste) Regulations 1974 must be lodged every time you intend to construct and install an apparatus for on-site wastewater disposal.
Who approves the application?
All applications must be lodged to the Local Government Authority (LGA) in the first instance. If it is intended that the proposed apparatus will handle less than 540L/day of wastewater and the building to be serviced is a single dwelling the LGA will process your application.
If the wastewater volume generated is more than 540L/day and the building being serviced is not a single dwelling the LGA will assesses your application, prepare a local government report and forward the application for processing directly to Department of Health (DOH):
Water Unit
Environmental Health Directorate
Department of Health
PO Box 8172
PERTH BUSINESS CENTRE WA 6849
How payment is made?
The LGA fees should be paid directly to the LGA for the district in which the apparatus will be installed. I believe its $226 which includes inspection fee