Effluent Disposal Design
Land application and effluent disposal design for on-site wastewater systems on properties without reticulated sewer — sized for approval and long-term performance.
Designing a disposal system that works — and gets approved
Once soil percolation and site conditions are understood, that data needs to be translated into an effluent disposal design that council will approve and that will perform reliably for the life of the system. This covers sizing and layout of the land application area — whether that’s an absorption trench, evapotranspiration bed, subsurface irrigation area or other approved disposal method — matched to your soil’s absorption rate, expected daily wastewater flows, and site constraints.
Design also has to account for setbacks to dwellings, boundaries, waterways and bores, site slope and drainage, and any buffer or reserve area required for system replacement. Getting the design right the first time reduces the risk of council requesting resubmission, and reduces the risk of premature system failure once installed.
Soiltester prepares effluent disposal designs that are supported by our own on-site percolation and soil testing, so the design is grounded in your site’s actual conditions rather than generic assumptions.
What's included
- ✓ Land application area sizing based on soil absorption rate and flow
- ✓ Layout design accounting for setbacks and site constraints
- ✓ Reserve area allowance for future system replacement
- ✓ Council-ready design documentation
- ✓ Coordination with your septic soil testing results
Who this service is for
Rural and acreage landholders, owner-builders and developers who need an effluent or on-site sewage disposal design to support a development or building application.
Related questions
Do I need septic soil testing before effluent disposal design?
Yes — the disposal design is sized directly from your soil's measured percolation/absorption rate, so on-site testing typically comes first.
What if my block is too small or too steep for a standard trench?
Constrained sites often use alternative systems such as aerated wastewater treatment (AWTS) with subsurface irrigation, which need less land area than a standard absorption trench — we can advise on the best fit for your site.
Need an effluent disposal design for council approval?
We'll size and design your system based on real site data, not guesswork.