No, storm drains and sanitary sewers have two distinct functions. Storm drains are intended to collect and transport runoff from rainfall. Storm drain systems do not remove pollutants from water before it is discharged into streams and rivers. These are typically the drains found in streets and in parking lots. Sanitary sewers collect wastewater from indoor plumbing such as toilets, sinks, washing machines and floor drains and take it to a sewage treatment plant.
The treatment plant removes many pollutants from wastewater before it is discharged to the river.