Which of the following is NOT a common environmental hazard found in residential areas?

C. Substandard plumbing is the correct answer because it is not classified as an environmental hazard in the same context as the other options. Environmental hazards typically refer to substances or conditions that can pose risks to health and safety in the environment around us.

Pesticides, radon, and lead-based paint are all recognized environmental hazards.

Pesticides can contaminate soil and water supplies, posing health risks to residents and impacting local ecosystems. Radon is a naturally occurring radioactive gas that can accumulate in homes, particularly in basements, leading to serious health risks, including lung cancer, if not properly mitigated. Lead-based paint, common in homes built before 1978, can chip and create lead dust, which is hazardous, especially for children and pregnant women, as it can cause serious neurological damage.

Substandard plumbing, while it can lead to issues like water contamination or structural damage, does not fit the same definition of an environmental hazard because it pertains more to the quality of infrastructure rather than a toxic or hazardous substance in the environment itself. Therefore, C is the option that stands apart from the common environmental hazards listed in the other choices.