Yes, a persistent sewage smell inside a house is potentially harmful to both your health and household safety. Continuous exposure to sewer gas vapors—which contain toxic hydrogen sulfide, methane, carbon dioxide, and ammonia—can lead to chronic respiratory irritation, severe headaches, nausea, dizziness, and fatigue. Additionally, if the sulfur odor originates from a significant natural gas leak or a massive accumulation of explosive methane gas in a confined basement or crawlspace, it presents a catastrophic fire hazard. Verification: Ventilate the affected space immediately and hire a licensed professional plumber or gas specialist to inspect your home.
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