West Hornsby Wastewater Treatment Plant, Sydney, New South Wales

West Hornsby wastewater treatment plant is located in the Hornsby Shire of Sydney, New South Wales, Australia. It serves a population of around 276,500, classifying it as a large agglomeration under Australian wastewater management standards. The facility is operational and plays a key role in the region's sanitation infrastructure. The plant's designed capacity is 1.00 million liters per day. As a large-scale facility in Australia, it is expected to meet stringent treatment standards set by the New South Wales Environment Protection Authority (EPA) under the Protection of the Environment Operations Act. Treatment typically includes secondary or tertiary processes to protect receiving waters. The plant discharges treated effluent into local waterways that ultimately flow into the Hawkesbury-Nepean River system and then into the Tasman Sea. This downstream environment supports diverse aquatic ecosystems and is important for regional water quality and recreational use.

The plant's treated effluent enters the local catchment, which drains into the Hawkesbury-Nepean River system and eventually reaches the Tasman Sea. This watershed supports a variety of aquatic life and is used for recreation and water supply. Protecting water quality in this system is critical for maintaining ecological health and downstream uses.