Is a sewage backup dangerous?

Yes. Sewage is Category 3 ("black") water — it carries bacteria like E. coli, viruses, and parasites, and contact or aerosolized exposure can cause real illness. The hazard is not just the visible mess: everything porous the water touched keeps hosting pathogens after it looks dry, and a household shop-vac or fan turns contaminated water into contaminated air.

The safe response: keep people and pets out, do not run HVAC that can pull air from the space, do not vacuum it, and wash immediately if skin contacted the water. Professional cleanup means containment, PPE, removal of contaminated porous materials, disinfection of hard surfaces, and verified drying — CDC and IICRC S500 protocols.

Coverage note: sewer backup usually requires its own endorsement on a homeowners policy, like sump failure. If you carry it, this is precisely what it is for — and we handle the documentation and bill the carrier directly.