https://www.melbournewater.com.au/community-and-education/about-our-water/history-and-heritage/history-sewerage/werribee-farm
The first treatment lagoon was constructed in 1936. Lagoon treatment facilities have been continuously upgraded to meet the needs of Melbourne’s growing population, with the first large, modern lagoon installed in 1986.Today, all sewage at the Western Treatment Plant is treated in modern lagoons, which replace the old lagoons and traditional filtration methods. The new methods remove large amounts of nitrogen that would otherwise enter the bay, and produce high-quality recycled water — a valuable resource used both on and off site.
