What does the term “threshold quantity” refer to in the context of hazardous substances?

The term "threshold quantity" in the context of hazardous substances specifically refers to the minimum amount of a substance that must be present before the owner or operator is required to notify regulatory authorities. This is a critical requirement in environmental protection and public safety, as it helps ensure that authorities are aware of potentially hazardous materials that could pose risks to health and the environment.

Understanding this concept is essential for compliance with regulations. If an entity has a quantity of a hazardous substance that meets or exceeds this threshold, they have specific legal obligations, including reporting and possibly implementing safety measures to mitigate any risks associated with that substance. This helps maintain safety standards and ensures that governmental agencies can effectively manage and respond to hazardous substances in their jurisdiction. Other options, while they may touch on aspects of regulatory compliance, do not accurately capture the defined meaning of “threshold quantity.”