In Greater Mexico City, what health concern is associated with the use of wastewater in agriculture?

• A. Health concerns about the reuse of wastewater in agriculture
• B. There are no health concerns
• C. Wastewater is always safe
• D. Wastewater is never used in agriculture

Answer: (A)

Using wastewater for irrigation introduces health risks because it can carry disease-causing organisms and chemical contaminants. If wastewater isn’t properly treated, pathogens such as bacteria, viruses, and parasites can contaminate crops, soil, and irrigation water. People can be exposed through handling the water, contact with contaminated soil, or by eating produce that has surface contamination, especially if eaten raw. In Greater Mexico City, wastewater reuse is practiced in some agricultural areas due to water scarcity, so understanding these health risks is essential. With appropriate treatment and management—like effective purification, careful irrigation methods, crop protection, employee safety measures, and thorough washing of produce—risks can be reduced, though not completely eliminated. That’s why acknowledging health concerns about wastewater reuse is important, rather than assuming there are none, that it’s always safe, or that it’s never used.