Seawater Reverse Osmosis System and In-house Water Bottling at The St. Regis Bali Resort in Indonesia

As a shoreline property, the The St. Regis Bali Resort in Indonesia holds an essential duty to conserve naturally existing water supplies and minimize its ecological impact. An advanced seawater reverse osmosis (SWRO) system has been implemented at the property that allows the resort to independently supply clean water for guest rooms, swimming pools, landscaping and operational needs. Seawater drawn from the shoreline is filtered and desalinated through a multi-stage purification process and integrated into the resort’s water infrastructure. This significantly reduces dependence on Bali’s fragile freshwater sources.

The in-house water bottling initiative greatly contributes toward lowering the resort’s carbon footprint by cutting down on water transportation, packaging production and plastic waste management. In pursuit of refined sustainability, the resort has introduced cutting-edge filtration systems that have been developed in collaboration with Biosystems. This initiative makes efficient use of seawater, reduces freshwater use and lowers water costs by up to 20 percent. Completely eliminating the need for single-use plastic bottles, the water is purified, bottled in reusable glass bottles as still water and distributed across guest rooms, restaurants and event spaces. In 2025, this initiative has helped prevent up to 170 million plastic bottles from entering landfills or polluting the ocean. The approach reflects a shift toward closed-loop thinking, where essential guest services are delivered through local, self-sufficient systems.