Sydney’s main source of water came from the tank stream in Sydney cove before it was polluted in 1826. Pipes were laid out throughout Sydney and we became more dependent on bore water. The Upper Nepean and Warragamba dam were considered to be the solution. The government has built Primary, Secondary and tertiary Wastewater treatment plants. These plants help remove solids, inorganic material, organic, metals, pathogens, nitrogen and phosphorus. Now the government has proposed a Desalination plant at Kurnell to help Sydney’s water crisis.