The Kimberley region of Western Australia experienced unprecedent heavy rainfall and severe flooding caused by Ex-Tropical Cyclone Ellie in December 2022 and January 2023. The floods caused significant damage to infrastructure leaving affected communities without access to essential services, including the disruption to drinking water and wastewater services. The Department of Health’s Environmental Health Directorate, as WA’s regulator of drinking water and wastewater infrastructure for safeguarding public health, played a key role in providing expert advice and guidance to various state and local agencies to mitigate public health risks during the preventative, preparedness, response and recovery phases of the disaster.