Many people confuse the terms of wastewater and sewage. According to Wikipedia, wastewater is any water that has been corrupted by human waste, but can also include industrial pollutants, as well as surface, storm or sewer runoff. Sewage is a specific type of wastewater from human waste.
A leak of chlorine gas or spillage of chlorine liquid is no joke. The substance can be extremely harmful to anyone who comes into contact with it, causing a wide range of symptoms with varying degrees of severity.