Which of the following is NOT a common feature of emerging contaminants?

Emerging contaminants are substances that have been detected in the environment but are not yet regulated by existing environmental laws and policies. The characteristic that distinguishes emerging contaminants is their lack of well-established regulations, which is why the option referring to well-established environmental regulations is the correct answer.

Emerging contaminants typically exhibit resistance to conventional treatment methods, meaning that typical water treatment processes may not effectively remove them, which represents a significant challenge in managing water quality. Their presence in small concentrations adds to the complexity of effectively monitoring and addressing them, as traditional sampling methods may not detect inadequately low levels. Additionally, many emerging contaminants are associated with potential adverse effects on human health and ecosystems, underscoring the importance of studying and understanding these substances as awareness of their impacts grows.