Cross Connection Specialist General Practice Test

Where does the RPZ relief valve discharge?

To atmosphere Into the sewer Back into the supply line Into the downstream line

Correct Answer:

To atmosphere

Explanation:

The main idea is that the relief valve on an RPZ is meant to vent to the outside air. When the RPZ detects a fault or pressure condition that could push contaminated water back toward the potable system, the relief valve opens and releases water to the atmosphere. This keeps any potentially contaminated water from staying inside the piping or being directed into the sewer in a way that could compromise the supply. Venting to atmosphere provides a safe, visible outlet that cannot create a backflow path into the potable system. If the discharge were routed into a sewer or back into the supply line, it could fail to isolate contaminants or even reintroduce them into the drinking water.

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