What is usually the only required treatment for groundwater?

• A. Filtration
• B. Disinfection
• C. Chlorination
• D. Aeration

Answer: (B)

Disinfection is the main step used to ensure groundwater is microbiologically safe. Groundwater typically has low turbidity, so removing particulates (filtration) isn’t always needed. The primary public health risk in drinking water is microbes, and disinfection inactivates bacteria, viruses, and protozoa to meet microbial standards. Chlorination is a common way to achieve disinfection, but the concept being tested is disinfection itself—the process of killing or inactivating pathogens. Aeration, by contrast, targets gases and odors and doesn’t address microbial safety, so it isn’t the usual required treatment.