Why Is Sewage Flood Water More Dangerous Than Rain?

Sewage flood water carries bacteria, viruses, and parasites from human waste. These pathogens can cause gastrointestinal illness, skin infections, and respiratory problems if you touch or breathe them in. Rainwater, by contrast, typically contains only dirt, leaves, and other outdoor debris, which pose a much lower health risk.

Sewage also mixes with household chemicals, cleaning products, and other waste that can be toxic. The combination of biological and chemical hazards makes sewage water far more dangerous to handle. Even brief contact with sewage water can lead to infection, so you should avoid it entirely and keep children and pets away.

• Bacteria like E. Coli and Salmonella
• Viruses such as norovirus and hepatitis A
• Parasites including Giardia and Cryptosporidium
• Chemicals from household cleaners and pesticides
• Sharp objects or debris hidden in the water
• High levels of organic matter that feed mold growth

Sewage water soaks into porous materials like drywall, wood, and carpet, leaving behind harmful bacteria and odors. These materials often need to be removed and replaced because cleaning alone cannot fully eliminate the contamination. The longer sewage sits, the deeper it penetrates, increasing the cost and complexity of cleanup.

The moisture also promotes rapid mold growth, which can start within 24 to 48 hours. Mold spores can spread through the air and trigger allergies or asthma. You should act quickly to remove standing water and dry the area, but always wait for the pros to handle the sewage part.

Local water damage pros first assess the extent of contamination and identify the source of the sewage backup. They use pumps and vacuums to remove standing water, then dispose of contaminated materials safely. After that, they thoroughly clean and disinfect all affected surfaces using industrial-grade products.

The pros also dry the area with air movers and dehumidifiers to prevent mold growth. They may use antimicrobial treatments to kill remaining bacteria. The process usually takes several days, depending on how much water and what materials are involved. You should stay out of the area until the pros say it is safe.

• Remove standing water with pumps
• Discard contaminated porous materials
• Clean and disinfect hard surfaces
• Dry the area with air movers and dehumidifiers
• Apply antimicrobial treatments
• Document the damage for your insurance claim