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A gas leak in a household presents significant risks, primarily relating to the potential for explosion and health hazards due to inhalation of gas. Natural gas, which is commonly used for heating, cooking, and other household functions, is highly flammable. If a leak occurs, the accumulation of gas can create a serious risk of explosion, particularly if it comes into contact with an ignition source. In addition, inhalation of gas can lead to serious health issues, including asphyxiation, headaches, nausea, and in extreme cases, death.

The other choices, while they may present valid concerns in different contexts, do not relate directly to the immediate dangers posed by a gas leak. Increased heating costs could happen as a result of inefficient appliances, and decreased water quality is associated with plumbing issues rather than gas leaks. Long-term structural damage may occur due to other factors, but this is not a primary risk associated with gas leaks. The most concerning factor remains the threat to safety posed by potential explosions and health effects from gas inhalation.