Converting raw environmental data into information and analytics to support resource management and policy is challenging. In the Australian Capital Territory (ACT), numerous monitoring programs exist, delivered by a wide range of stakeholders for mandated monitoring, compliance and research purposes. The ACT Healthy Waterways, a joint Commonwealth/ACT Government project, is developing a data management system and catchment modelling capability to support data curation, analysis and decision making in the form of a decision support system (DSS). Effective implementation of the DSS will support the testing of scenarios related to the major pressures on aquatic ecosystems in the ACT, such as land development and climate change. Additionally, the relative cost-effectiveness of policy and management levers available to offset or mitigate impacts can be ‘tested’ prior to investment.