Water is one of our most precious resources. We depend upon it for our livelihoods, healthy ecosystems, and a robust economy. Yet, a host of challenges, such as aging infrastructure, biological and chemical contamination, population changes, and security events, threaten the safety and sustainability of our water resources. To address these complex issues, EPA is evaluating and developing innovative scientific and technological solutions that ensure clean, adequate, and equitable supplies of water to protect human health and to protect and restore watersheds and aquatic ecosystems.