Which statement best describes Category 3 Water?

• A. It contains pathogens, toxins, or bacteria
• B. It is potable water
• C. It is distilled water
• D. It is deionized water

Answer: (A)

Category 3 water is the most contaminated type, often described as black water, and it can carry harmful microorganisms and toxins. This makes the description that it contains pathogens, toxins, or bacteria the most accurate representation of what defines this category. Potable water is safe to drink and free from such contaminants, so it does not describe Category 3. Distilled or deionized water are purified forms with most impurities removed, not indicators of a contaminated category. In practice, Category 3 requires strict containment and protective procedures due to the health hazards posed by the contaminants.