From 2017-2022, the Australian Government's Health Security Initiative for the Indo-Pacific region contributed to the avoidance and containment of infectious disease threats with the potential to cause social and economic harms on a national, regional or global scale. With funding from the Initiative, the WISH Fiji project seeks to optimise water, sanitation and catchment management, improve outbreak response and minimise the impact of water-borne diseases. https://indopacifichealthsecurity.dfat.gov.au/watershed-interventions-systems-health-wish