Toxicity Identification Evaluation (TIE) and Toxicity Reduction Evaluation (TRE) are used when clients need to identify and remove the toxic components in a chemical mixture such as an effluent.

The TIE is a site‐specific study to isolate, identify, and confirm the causative agents of toxicity in an effluent or sediment. Bureau Veritas conducts TIE based on procedures promulgated by the United States Environmental Protection Agency (USEPA). The TRE procedure is used as a tool to identify toxic components that may be removed or reduced in an industrial effluent to alleviate toxicity problems. It is usually necessary to complete a TIE before performing the TRE.