Sewage water can be toxic. It can carry viruses, bacteria, pesticides, fungi, and parasites. Each year there are over two million sewage-related illnesses. The Dangers in Sewage Water Water intrusions damage our property and create headaches, sometimes quite literally, especially when flooding is involved. There are three classifications of floodwaters. They are clean water, grey water, and black water. Blackwater is hazardous and includes any water from sewage. This c