Question 1

How much does a new septic system cost to install in the Hunter Valley?

Accepted Answer

A new conventional septic tank and absorption trench system typically costs $8,000 to $14,000 AUD installed. An advanced Aerated Wastewater Treatment System (AWTS) such as Taylex, Fuji Clean, or Aqua Nova costs $15,000 to $25,000+ AUD including council application fees, soil testing, and subsurface irrigation lines.

Question 2

When does a local NSW council require an AWTS instead of a standard septic tank?

Accepted Answer

Councils require an AWTS when soil permeability is poor (heavy reactive Hunter clay), the block size is under 4,000m² (1 acre), groundwater tables are shallow, or the property is located within an environmentally sensitive drinking water catchment (such as Williams River or Grahamstown Dam catchments).

Question 3

What council approvals are needed for a septic replacement in NSW?

Accepted Answer

Under Section 68 of the Local Government Act 1993, you must lodge an application to install and operate an On-Site Sewage Management (OSSM) facility with your local council (Maitland, Cessnock, Singleton, Port Stephens, or Muswellbrook). This requires an accredited wastewater design and geotechnical soil report ($1,200–$2,200 AUD).

SEPTIC & AWTS REPLACEMENT COST ESTIMATOR

SYSTEM PARAMETERS