Which of the following is NOT regulated as hazardous waste?

Domestic sewage is not regulated as hazardous waste because it is subject to different regulatory frameworks compared to hazardous materials. The Resource Conservation and Recovery Act (RCRA) specifically defines hazardous waste primarily in terms of solid wastes that can pose substantial threats to human health and the environment. Domestic sewage, which typically includes waste from households such as sewage generated from bathrooms, kitchens, and laundry, is managed under the Clean Water Act rather than RCRA. This distinction is crucial since sewage is often treated in municipal treatment facilities to reduce pollutants before being released into the environment.

Conversely, flammable liquids and corrosive liquids are types of hazardous waste because they meet specific criteria established under RCRA. These substances can pose risks such as fire hazards or chemical burns and, therefore, are subject to stringent regulations to ensure safe management and disposal. Thus, it is essential to distinguish between these types of waste and domestic sewage, as the latter does not fall under hazardous waste regulations.