Wollondilly
Wollondilly septic and AWTS questions often come down to Picton, Thirlmere and rural land in Sydney’s drinking-water catchment. Typical work here includes septic pump-outs, AWTS servicing, repairs and replacements.

Soils and ground conditions in Wollondilly
Wollondilly has clay soils over Wianamatta shale in the north and sandstone in the south.
Many rural properties rely on septic or AWTS systems, and much of the shire sits in Sydney’s drinking-water catchment, where WaterNSW concurrence can apply to new systems.
Climate and on-site systems
Hot summers, drought and floods such as 2022 in Picton affect on-site systems.
A tank only works as well as the absorption or irrigation area after it: saturated, compacted or root-filled ground is the most common reason for slow drains, odours and wet patches, so the soil and the water table are checked as well as the tank.
Local approvals and rules
Wollondilly Shire Council approves and inspects on-site sewage management systems.
In New South Wales, installing or operating an on-site sewage management system needs council approval under section 68 of the Local Government Act 1993. Aerated wastewater treatment systems (AWTS) must be accredited by NSW Health and are serviced on a regular schedule, and councils inspect systems through their on-site sewage management programs.
Typical septic and AWTS work in Wollondilly
Septic pump-outs, AWTS servicing, repairs and replacements. Every property is different, so the system is located, opened and inspected on site before any repair is recommended or quoted.
Know where your tank, lids and absorption or irrigation area are, keep vehicles and structures off them, and have any service records ready before the visit.
Sydney Septic Pro in Wollondilly
We take septic and AWTS enquiries from Wollondilly and surrounding areas around the clock. Tell us the address, the type of system if you know it and what is happening, and we will arrange a visit.