Food Safety Certification Practice Test

What is the minimum time required to effectively disinfect water through boiling?

1. 2 minutes

2. 5 minutes

3. 10 minutes

4. 15 minutes

The correct answer is: 5 minutes

Boiling water is an effective method for disinfection because it kills pathogenic microorganisms, including bacteria, viruses, and parasites. The Centers for Disease Control and Prevention (CDC) recommends bringing water to a rolling boil for at least one minute to effectively kill most harmful organisms. However, at higher altitudes (above 6,500 feet), the boiling point of water is lower, so it is advised to boil water for at least three minutes in those conditions to ensure adequate disinfection. Five minutes is a suitable choice as it provides a margin above the minimum recommendation, ensuring thorough disinfection. Although boiling for a shorter duration (like two minutes) may still inactivate many pathogens, it may not guarantee complete safety, especially against more robust viruses and parasites. Therefore, a five-minute boiling time is practical and captures the essence of effective boiling time, especially considering safety margins and varying conditions. This standard aligns with public health recommendations, ensuring that the water is rendered safe for consumption.