Twenty-First Century Water Commission Act of 2003

Twenty-First Century Water Commission Act of 2003 - Establishes the Twenty-First Century Water Commission to: (1) use existing water assessments and conduct additional assessments necessary to project future water supply and demand; (2) study Federal, State, and local agency and private entity water management programs directed at increasing water supplies; and (3) consult with representatives of such agencies and entities to develop recommendations for a comprehensive water strategy that respects the primary role of States in regulating water rights and uses, identifies incentives for ensuring an adequate and dependable supply of water to meet U.S. needs for the next 50 years, considers all available technologies for increasing water supply efficiently while safeguarding the environment, and suggests financing options, strategies that avoid increasing mandates on State and local governments, and strategies to conserve existing water supplies.