What Hazardous Materials Can Flood Water Release in a Neighborhood?

Flooding often overwhelms municipal sewer systems and residential septic tanks. This can cause a backflow of raw sewage into the water. The water then contains bacteria, viruses, and parasites like E. Coli and norovirus. These biological hazards pose serious health risks, including gastrointestinal illness and skin infections, if you come into contact with the water or touch contaminated surfaces.

Mold growth is another major biological concern after flooding. Spores become airborne as materials dry, potentially causing respiratory issues. Any porous material soaked by sewage, like drywall or carpet, is a contamination source. Proper cleanup requires removing these materials safely to prevent ongoing exposure.

Flooding can disturb soil and sediment that contains naturally occurring heavy metals like lead and arsenic. More critically, it can dislodge these metals from old paint, batteries, or electronic waste stored in homes. Once in the water, these metals do not break down and can persist in the environment, posing long-term health risks.

Other pollutants include asbestos from older building materials and particulate matter from construction debris. Asbestos fibers, when disturbed, can become airborne and are a known carcinogen. The chaotic nature of a flood makes it difficult to identify all hazardous materials present, which is why professional assessment is crucial.

• Lead from old paint chips or pipes.
• Arsenic from treated wood or soil.
• Asbestos from insulation or vinyl tiles.
• Petroleum products like gasoline or motor oil.
• PCBs from older electrical equipment.
• Mercury from thermostats or fluorescent bulbs.

Do not attempt to clean extensive flood damage yourself if hazardous materials are suspected. The first action is to stop the water source if it is safe to do so, then document the damage with photos for insurance. Keep children and pets away from affected areas, and ventilate the space if it is safe to turn on electricity.

Specialized pros have the training and equipment to handle hazardous materials. They follow protocols for containment, removal, and disposal of toxic waste. For water removal and drying, emergency water extraction is a critical service. Policies vary, and your insurer decides what is covered, so check your policy and communicate with your insurance company.