How are hazardous substances categorized in UST regulation?

Hazardous substances in underground storage tank (UST) regulation are categorized based on federal or state regulations because these frameworks are established to provide a legal and systematic way of identifying which substances pose risks to human health and the environment. Regulations outline specific criteria for categorization, including physical properties, toxicity, environmental impact, and usage, which help determine the management required for these substances.

Federal and state regulations ensure consistent guidelines are followed, protecting public safety and environmental health. By having a regulatory basis for categorization, authorities can implement necessary controls and monitoring practices for substances that could potentially lead to soil, groundwater, or air contamination. This approach provides a comprehensive understanding of the risks associated with hazardous substances, ensuring that all relevant factors are considered.

The other methods, such as categorization by physical state, price, or chemical composition alone, do not provide the comprehensive legal framework that the regulations offer and may overlook important environmental and health implications. Such isolated approaches lack the regulatory oversight necessary for effectively managing the risks associated with USTs.