Under the Clean Water Act,the states have the main responsibility for regulating water pollution.

Clean Water Act

is a primary federal law in the United States governing water pollution, aiming to restore and maintain the chemical, physical, and biological integrity of the nation's waters.

Water Pollution

The contamination of water bodies such as lakes, rivers, oceans, and groundwater caused by harmful substances being discharged into them.

Main Responsibility

The primary duty or obligation that an individual or entity is expected to fulfill.