Septic system approvals: how it works in every state

Every Australian state regulates on-site wastewater differently — different acts, different forms, different fees. But underneath the paperwork, the same three-part pattern holds almost everywhere:

1. Your council (or local government) is the approval body. You apply to them before anything is installed, and they inspect the work. The main exceptions are the NT and ACT, where territory agencies fill the role.
2. The system itself must be state-accredited. Each state keeps a list of approved or accredited treatment systems — a tank or treatment plant that isn't on your state's list can't be approved for your block, no matter how good the brochure looks.
3. The installer must be licensed. A licensed plumber or drainer does the physical work everywhere in Australia, and in most states they sign certificates that form part of the approval.

Get those three things lined up — a willing council, an accredited system that suits your soil, and a licensed installer — and approval is mostly a matter of forms, fees and waiting. Skip any one of them and you risk an unapproved system that surfaces at sale time, or a demand to dig it up.

Most applications also need a site-and-soil assessment (called a land capability assessment in some states) prepared to AS/NZS 1547, the Australian standard for on-site domestic wastewater management. That report — not your installer's opinion — is what tells the council which systems your block can support.

Pick your state below for the exact process, the forms by name, and what it typically costs.