<Li> Overridden by the House and became law on October 18, 1972 (247 - 23) </Li> <Tr> <Th_colspan="2"> Major amendments </Th> </Tr> <Tr> <Td_colspan="2"> Clean Water Act of 1977; Water Quality Act of 1987 </Td> </Tr> <Tr> <Th_colspan="2"> United States Supreme Court cases </Th> </Tr>

Why was the clean water act of 1977 created