Which material is classified as hazardous waste?

Gypsum drywall is classified as hazardous waste when it contains certain contaminants, such as lead or other heavy metals, especially if it has been used in a toxic environment or has come into contact with hazardous substances. During construction and renovation, improper disposal of such materials can lead to environmental issues, making it essential to handle them in compliance with regulations set forth by environmental agencies.

In contrast, the other materials listed—plastic containers, cardboard, and wood shavings—are generally not classified as hazardous waste under standard conditions. While they may pose recycling or disposal challenges, they do not typically meet the criteria for hazardous waste that is defined by characteristics such as ignitability, corrosivity, reactivity, or toxicity. Understanding these classifications is vital for contractors to ensure compliance with environmental laws and to safeguard public health.