1. It must be an approved system
In Queensland, treatment plants must be an approved type. Business Queensland explains the approval process and where to find approved systems. Ask the installer to confirm approval for the model.
2. Council approval and a site assessment
Installing an AWTS needs a plumbing and drainage approval from Toowoomba Regional Council, usually supported by a site and soil evaluation. See council approvals.
3. Ongoing servicing
AWTS generally must be serviced by a qualified technician on a regular schedule, commonly every 3 months. Ask who services the brand locally and what a service contract costs. See AWTS servicing.
4. Running costs
Unlike a plain septic tank, an AWTS has pumps and blowers that use power, plus parts that wear out. Ask for expected power use and common replacement parts.
5. The irrigation area
Treated water is usually dispersed through an irrigation area, so you need suitable space. See looking after your irrigation area.
6. A licensed installer
QBCC notes that on-site sewerage work must be done by a plumber with the right licence endorsement. Check the licence on the QBCC register.
Related
Sources: Business Queensland – On-site sewage facilities · Toowoomba Regional Council – On-site sewerage facilities · QBCC – Home Owners Guide to Plumbing Matters. General guidance only; check with council or a licensed provider for your property.