Which pollutant is NOT typically found in municipal wastewater?

Municipal wastewater primarily originates from domestic, commercial, and industrial sources. Key pollutants commonly found in this type of wastewater include organic matter, pathogens, and heavy metals. Organic matter refers to the biodegradable substances that come from human waste, food waste, and sewage, all of which are significant contributors to the biological load in wastewater systems. Pathogens such as bacteria, viruses, and parasites often enter wastewater through human waste and can pose serious public health risks if not properly treated. Heavy metals, including lead, mercury, and cadmium, can enter municipal wastewater from various sources like industrial processes, household products, and even plumbing systems.

In contrast, radioactive waste is not typically present in significant quantities in municipal wastewater. While there may be some instances where radioactive materials enter wastewater, such occurrences are generally linked to specific industrial activities or medical procedures rather than the general population's daily activities. Therefore, radioactive waste is considered an atypical contaminant in municipal wastewater, making it the correct answer to the question.