The Freshwater Health Index provides policy-makers and resource managers with a tool to evaluate policies, management options, and tradeoffs, as well as communicate basin health to the public. The Freshwater Health Index defines freshwater health as the ability to deliver water-related ecosystem services, sustainably and equitably, at the drainage basin scale. Within the Freshwater Health Index, the three components of ecosystem health include ecosystem vitality (i.e., water quantity, water quality, basin condition, and biodiversity), ecosystem services (i.e., provisioning, regulation and support, and cultural), and governance & stakeholders (i.e., enabling environment, stakeholder management, vision and adaptive governance, and effectiveness).