Domestic wastewater which passes through a sewer system to a POTW is not considered to be a:

Domestic wastewater that flows through a sewer system to a Publicly Owned Treatment Works (POTW) is typically comprised of water and organic matter from residential use. This type of wastewater is not classified as solid waste because solid waste is generally defined as refuse or garbage that is solid in state and typically includes materials like paper, plastics, and food waste.

Additionally, this wastewater is not considered hazardous waste unless it contains specific hazardous substances that pose a threat to human health or the environment. Hazardous waste is characterized by its potential risk due to its chemical properties, such as ignitability, corrosivity, reactivity, or toxicity. In most cases, the domestic wastewater treated at a POTW does not meet these criteria and is thus not classified as hazardous.

The inclusion of both solid waste and hazardous waste in the correct answer emphasizes that domestic wastewater is treated differently from these categories and is specifically designated for treatment at a POTW. Therefore, recognizing wastewater's unique classification is crucial for efficient waste management practices.