Which method primarily reduces waterborne diseases?

Which method primarily reduces waterborne diseases?

• A. Filtration only
• B. Sedimentation
• C. Disinfection
• D. Boiling only

Answer: (C)

The key idea is that preventing illness from water relies on inactivating or killing the disease-causing organisms present in the water. Disinfection does exactly that: it uses chemical or physical processes to destroy or inactivate pathogens such as bacteria, viruses, and parasites. This directly lowers the chance of people getting sick from drinking or using the water, which is why it’s considered the primary way to reduce waterborne diseases. Filtration helps by removing particles and many microbes, improving clarity and reducing the load, but some pathogens can still slip through if disinfection isn’t used. Sedimentation mainly clears out solids and reduces turbidity; it doesn’t inactivate microbes. Boiling can kill pathogens, but it’s a point-of-use method and not the standard treatment step used to protect an entire water supply. So disinfection stands out as the method that most directly lowers disease risk in water supplies.

The key idea is that preventing illness from water relies on inactivating or killing the disease-causing organisms present in the water. Disinfection does exactly that: it uses chemical or physical processes to destroy or inactivate pathogens such as bacteria, viruses, and parasites. This directly lowers the chance of people getting sick from drinking or using the water, which is why it’s considered the primary way to reduce waterborne diseases.

Filtration helps by removing particles and many microbes, improving clarity and reducing the load, but some pathogens can still slip through if disinfection isn’t used. Sedimentation mainly clears out solids and reduces turbidity; it doesn’t inactivate microbes. Boiling can kill pathogens, but it’s a point-of-use method and not the standard treatment step used to protect an entire water supply. So disinfection stands out as the method that most directly lowers disease risk in water supplies.