Which statement is true regarding waterborne disease transmission?

Which statement is true regarding waterborne disease transmission?

• A. Pathogens are never transmitted through water
• B. Water treatment has no effect on pathogens
• C. Disinfection is the only method to ensure water is pathogen-free
• D. Infected fecal matter entering a water supply transmits pathogens to healthy people

Answer: (D)

Waterborne disease transmission occurs when pathogens from fecal matter contaminate a water supply and people ingest that water. If someone who is infected sheds pathogens in their feces and those pathogens reach the drinking water, healthy people can become sick after drinking or using that water. This is the direct route that explains why water contamination leads to illness. That statement is the true one because it states the fundamental transmission pathway: fecal contamination can introduce disease-causing organisms into water, which then reaches and affects people. Water treatment and disinfection are essential defenses, but no single step guarantees zero risk on its own; multiple barriers work together—protecting sources, preventing contamination, treating water, and maintaining proper disinfectant levels in the distribution system. The other choices are inaccurate because water can indeed transmit pathogens, treatment does affect pathogens, and disinfection is important but not the only method to keep water safe.

Waterborne disease transmission occurs when pathogens from fecal matter contaminate a water supply and people ingest that water. If someone who is infected sheds pathogens in their feces and those pathogens reach the drinking water, healthy people can become sick after drinking or using that water. This is the direct route that explains why water contamination leads to illness.

That statement is the true one because it states the fundamental transmission pathway: fecal contamination can introduce disease-causing organisms into water, which then reaches and affects people. Water treatment and disinfection are essential defenses, but no single step guarantees zero risk on its own; multiple barriers work together—protecting sources, preventing contamination, treating water, and maintaining proper disinfectant levels in the distribution system. The other choices are inaccurate because water can indeed transmit pathogens, treatment does affect pathogens, and disinfection is important but not the only method to keep water safe.