What is the minimum pressure required when testing a water-supply system?

• A. 20 psi
• B. 30 psi
• C. 40 psi
• D. 50 psi

Answer: (D)

The minimum pressure required when testing a water-supply system is established to ensure that the system can handle operational pressures without leaking or failing. A pressure of 50 psi is commonly used as the testing benchmark because it provides a sufficient margin above typical operating pressures to identify potential weaknesses in the system. This testing pressure helps ensure that connections, fittings, and other components can withstand conditions they will experience in actual use. By setting the minimum test pressure at this level, inspectors can confidently assess the integrity of the water-supply system and ensure it meets safety and performance standards.