Which component connects the irrigation mainline to the water service line?

• A. Pressure regulator
• B. Point of Connection (POC)
• C. Backflow device
• D. Mainline isolation valve

Answer: (B)

The Point of Connection (POC) is the component that connects the irrigation mainline to the water service line. This is a critical junction in the irrigation system because it marks the location where water from the municipal supply (or other source) enters the irrigation system. The POC ensures that water flows into the irrigation system correctly and can help identify where the irrigation system integrates with the public water supply.

Understanding the function of the POC is essential for proper irrigation design and maintenance. It often needs to meet local codes, which can include considerations for backflow prevention, pressure regulation, and system isolation.

In contrast, other components, while important, serve different functions in the irrigation system. For example, a pressure regulator is used to control the water pressure within the irrigation system itself, ensuring that it operates efficiently without damaging components due to excess pressure. A backflow device is designed to prevent contamination of the water supply by stopping any potential backflow of water from the irrigation system. The mainline isolation valve allows for the entire irrigation system to be shut off for maintenance or repairs, but it does not serve as the direct connection to the water service line. Understanding these distinctions helps clarify the specific role of the Point of Connection in relation to the entire irrigation