Which of the following is not included in hazardous waste regulations?

Domestic sewage is indeed not included in hazardous waste regulations primarily because it is regulated by separate environmental statutes. Sewage generated from households and other similar sources is typically managed under wastewater treatment regulations governed by the Clean Water Act. This distinction is made to ensure effective treatment and handling of wastewater, which differs significantly from hazardous waste that poses a higher risk to human health and the environment.

In contrast, flammable liquids and corrosive liquids often fall within the categories of hazardous waste due to their dangerous properties. Regulations outline specific criteria for the management, treatment, and disposal of such materials to mitigate risks associated with their potential environmental and health impacts. Thus, recognizing domestic sewage as an exception helps clarify the scope of hazardous waste regulations.