It is managed by the National Pollutant Discharge Elimination System ( NPDES ) permit program .
The U.S. Environmental Protection Agency ( EPA ) issued a policy in 1994 requiring municipalities to make improvements to reduce or eliminate CSO - related pollution problems .
U.S. Environmental Protection Agency is managed by the National Pollutant Discharge Elimination System ( NPDES ) permit program .
The U.S. Environmental Protection Agency ( EPA ) issued a policy in 1994 requiring municipalities to make improvements to reduce or eliminate CSO - related pollution problems .