Texas Commission on Environmental Quality (TCEQ). Class C Water License Exam

How often must public water systems flush dead-end mains to ensure water quality?

1. Once every week

2. Once every month

3. Once every three months

4. Once every year

The correct answer is: Once every month

Public water systems are required to flush dead-end mains at least once every month to maintain water quality. This practice is essential because dead-end mains can lead to stagnant water, which is more susceptible to bacterial growth and sediment accumulation. By performing monthly flushing, the system ensures that fresh water flows through these lines, preventing water quality issues and ensuring that disinfectants, such as chlorine, are maintained at adequate levels throughout the distribution system. Regular flushing helps to remove potential contaminants, maintain low coliform levels, and promote the overall safety of drinking water for consumers. This monthly requirement reflects best practices in water distribution management to protect public health.