Conceptualised and managed by Singapore’s national water agency, PUB, the system is Singapore’s superhighway to meet its used water needs for the next 100 years in a cost-effective and sustainable way. One of the world’s largest used water collection and treatment projects, the DTSS conveys used water from homes and industries through a 48 km long deep tunnel sewer that runs 20 to 55 metres below ground to a centralised water reclamation plant for treatment. The official opening of this plant, the Changi Water Reclamation Plant, is a highlight of the upcoming Singapore International Water Week.