Which of the following is associated with using a pressure tap to make connections of new mains to an existing main?

Using a pressure tap to make connections of new mains to an existing main is associated with a low probability of contamination. This method allows for a secure and controlled means of connecting, minimizing the risk that contamination will occur during the process.

When a pressure tap is used, it typically involves taking precautions to maintain the integrity of the existing main and the new connection. The system is usually pressurized, which helps prevent backflow or the introduction of contaminants from outside sources during the connection process.

In water distribution and pipeline work, maintaining high standards of hygiene and safety is crucial to avoid contamination issues. Therefore, while no method is entirely without risk, the use of pressure taps is designed to enhance safety and reduce the chances of introducing contaminants into the system, contributing to the moderate risk profile associated with this technique.