a substance, element, or compound that may harm humans or other forms of life if released into the environment. Refers to concentrations that are above acceptable levels and/or are in a location where they should not be found.
Example: Asbestos, benzene, radon, PCBs, perchloroethylene, and lead-based paint are contaminants. Tests for these substances are commonly prepared as part of the due diligence process in the purchase or financing of real estate. Testing for some is routine; for others, tests are done only if a property is suspect. For example, benzene may result from a leaking petroleum storage tank, perchloroethylene from dry cleaner disposals, and PCBs from disposed electrical transformers. Normally, a property would be tested for these only if there were reason to suspect their presence.
