Final answer:
There are approximately 1,467 commercial hazardous waste treatment, storage, and disposal facilities in the United States as of 2021.
Step-by-step explanation:
Commercial hazardous landfills are regulated by the United States Environmental Protection Agency (EPA). According to the EPA, there are approximately 1,467 commercial hazardous waste treatment, storage, and disposal facilities in the United States as of 2021. These facilities are responsible for handling and disposing of hazardous waste materials from industries and businesses. They must meet strict regulations to ensure the safe containment and management of these wastes in order to protect human health and the environment. Examples of hazardous waste typically managed by these commercial hazardous landfills include chemical byproducts, contaminated soil, and certain types of medical waste.