Floodwater and sewage
CDC says floodwater may contain human or animal waste, chemicals, hazardous materials, debris, and downed power lines. Avoid contact and do not treat visibly contaminated water as an ordinary spill.
When extra caution is needed
Contaminated water and electricity change what should happen next.
The visible amount of water does not reveal whether it contains sewage, chemicals, debris, microorganisms, or an electrical hazard.
Wet electrical systems
Do not enter standing water to access a breaker or touch wet equipment. A qualified electrical inspection may be needed before power or equipment returns to service.
Mold and air movement
EPA warns that fans can spread mold when visible growth is present. Do not disturb mold or improvise air movement when contamination may be present.
HVAC systems
EPA advises against running HVAC systems known or suspected to be contaminated with mold or affected by floodwater because contaminants may spread through the building.
More than one professional may be needed
Contaminated-water cleanup, electrical work, HVAC assessment, restoration, and later repairs may be handled by different qualified professionals.
Myth correction
“It is only a little water” does not mean it is safe.
The source, path, materials affected, time elapsed, utilities, occupants, and visible contamination all matter. Do not disinfect, power equipment, pump water, or disturb mold when the hazards are uncertain.