Wastewater treatment plants

We own and operate 16 wastewater treatment plants.

We collect more than 1.3 billion litres of wastewater from over 1.8 million homes and businesses in Sydney, the Illawarra and the Blue Mountains every day.

We treat the wastewater before it's re-used or discharged to rivers or oceans, following strict licence conditions issued by the NSW Environment Protection Authority (EPA). They also monitor the effect of discharges on water quality and aquatic life.

We also produce biosolids - the nutrient rich material created from treating wastewater solids. Biosolids are a rich source of phosphorus and nitrogen, which can be used in agriculture, composting and land rehabilitation. 
 

Treatment plant Treatment level Discharge
(ML/ day)
Discharge location
Bellambi* Primary
(includes screening, actiflow treatment and disinfection)
0 Bellambi Point during wet weather
Bondi Primary 126.5 Deepwater ocean outfall 2.2 km from shoreline, 63 m maximum water depth, 512 m diffuser zone.
Brooklyn Tertiary
(includes disinfection using ultra-violet light and membrane bioreactor technology)
0.2 Hawkesbury River, Brooklyn
Cronulla Tertiary
(disinfection)
53 Potter Point, Kurnell
Fairfield* Primary
(includes chemically assisted sedimentation)
0 Orphan School Creek (to Georges River) during wet weather
Hornsby Heights Tertiary
(includes additional phosphorus and nitrogen removal and disinfection)
5.2 Calna Creek to Berowra Creek
Malabar Primary 488 Deepwater ocean outfall 3.6 km from shoreline, 82 m maximum water depth, 720 m diffuser zone
North Head Primary 336 Deepwater ocean outfall 3.7 km from shoreline, 65 m maximum water depth, 762 m diffuser zone
North Richmond Tertiary
(includes additional phosphorus removal and disinfection)
0.9 Redbank Creek to the Hawkesbury River
Port Kembla* Primary
(includes screening, de-gritting, primary sedimentation and disinfection)
0 Red Point during wet weather
Riverstone Tertiary
(includes additional phosphorus removal and disinfection)
1.8 Eastern Creek to South Creek
Shellharbour Secondary
(includes disinfection)
16.9 Offshore outfall 130 m from Barrack Point, with diffuser zone 
Wallacia Tertiary
(includes additional phosphorus and nitrogen removal and disinfection)
0.6 Warragamba River
Warriewood Secondary
(includes disinfection)
17.6 Turimetta Head
West Hornsby Tertiary
(includes additional phosphorus and nitrogen removal and disinfection)
11.9 Waitara Creek to Berowra Creek
Winmalee Tertiary
(includes additional phosphorus and nitrogen removal and disinfection)
16.5 Unnamed creek to the Nepean River

The smaller coastal treatment plants at Warriewood, Cronulla, Port Kembla, Shellharbour and Bellambi discharge treated effluent closer to the shore.

Less than one per cent of Sydney's wastewater is discharged untreated to the ocean at Vaucluse, Diamond Bay and Diamond Bay South.


* Bellambi, Port Kembla and Fairfield are storm water plants and only receive flow during storm events.