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America's oldest and largest grass roots environmental organization with more than 700,000 members. Sierra Club members work not only to preserve unspoiled wild lands but also to protect endangered species and help enact policies so that the air we breathe and the water we drink is safe.

Since its founding during the campaign to pass the landmark Clean Water Act in 1972, Clean Water Action has worked to win strong health and environmental protections by bringing issue expertise, solution-oriented thinking and people power to the table. The mission of CWA is to protect the environment, health, economic well-being and community quality of life. Clean Water Action organizes strong grassroots groups and coalitions, and campaigns to elect environmental candidates and to solve environmental and community problems.