The Clean Water Act (CWA) is the primary federal law in the United States governing water pollution. Its objective is to restore and maintain the chemical, physical, and biological integrity of the nation's waters by preventing point and nonpoint pollution sources, providing assistance to publicly owned treatment works for the improvement of wastewater treatment, and maintaining the integrity of wetlands. It is one of the United States' first and most influential modern environmental laws. As with many othe (10h 51min, may 6, 1977 y – 11h 14min, aug 16, 1977 y)
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10h 51min, may 6, 1977 y
11h 14min, aug 16, 1977 y
~ 3 months and 12 days