Before revision: In the United States, cities, suburban communities and towns with over 10 ,000 population are required to obtain discharge permits for their storm sewer systems, under the Clean Water Act.United States.
After revision: In the United States, cities, suburban communities and towns with over 100, smaller community drainage systems in urbanized areas and additional municipal systems that are specifically designated by state agencies ,000 population are required to obtain discharge permits for their storm sewer systems, under the Clean Water Act.United States.