A sewage backup in your home isn't just gross—it's a serious health hazard. Raw sewage contains bacteria, viruses, and parasites that can cause illness, plus toxic gases like methane and hydrogen sulfide. Even if you avoid direct contact, contaminated surfaces and airborne particles can make the air unsafe to breathe. In most cases, it's best to leave until a professional can clean, disinfect, and fix the drain issue. If you must stay, seal off the affected area, wear gloves and a mask, and avo… is it safe to stay in a house with a sewage backup 49