A potable water distribution system is tested with which method?

• A. Water pressure
• B. Air or water pressure
• C. Air pressure
• D. Vacuum test

Answer: (B)

Pressurizing the system to reveal leaks is the testing approach for a potable water distribution network. You can use either water or air to create that pressure. In a water (hydrostatic) test, the pipes are filled with water and pressurized to a specified level; any drop in pressure or visible seepage shows leaks that need repair. An air pressure test does the same thing with compressed air, checking for leaks by monitoring pressure loss or movement of joints. Both methods are standard options, depending on codes and the situation, which is why “air or water pressure” is the correct choice. A vacuum test isn’t used for potable water distribution, as it’s associated with testing drainage or vent piping rather than the water supply.