Which term stands for a toxic chemical compound once used in electrical equipment?

• A. Polychlorinated Biphenyl
• B. Center for Watershed Protection
• C. Total Maximum Daily Load
• D. Virginia Runoff Reduction Method

Answer: (A)

Polychlorinated biphenyls are toxic chemical compounds that were once used in electrical equipment. They served as dielectric fluids and were common in transformers and capacitors because they resist heat and stay stable over time. But their stability makes them persist in the environment and bioaccumulate in living organisms, which leads to serious health and ecological risks. Because of that, their production and use were heavily restricted or banned in many places, and they’re handled as hazardous waste when found in old equipment or contaminated materials. In stormwater contexts, PCBs can enter waterways through leaks, improper disposal, or degradation of old electrical gear, making them a notable contaminant of concern.

The other terms refer to organizations or regulatory concepts rather than a chemical compound: one is a nonprofit focused on watershed research, another is a regulatory limit for pollutants in a water body, and the last is a specific stormwater runoff management approach.