RPZ testing ensures your plumbing system does not draw in contaminated groundwater. Plumbing systems require valves to be installed in commercial and residential plumbing systems. They need to be tested and verified annually by a licensed professional.

Potential Backflow Problems with Your Plumbing System

Plumbing systems are typically designed to keep water at a specific pressure to keep it flowing normally. However, if the pressure falls, contaminated groundwater can enter a system, leading to a potentially serious issue known as backflow. As the pressure gets lower, water flows in the wrong direction, or backflows, drawing in water.


This is the same contaminated that is used by appliances and industrial equipment. Water containing pesticides or fertilizers from landscaping could infiltrate the drinking supply, as well.


The following conditions can cause water backflow:


●        Water pressure may drop suddenly due to a nearby main break.

●        The fire department may have to tap into a hydrant.

●        Small fluctuations in the city water main may occur.

RPZ Valve Function

To keep this backflow from occurring, an RPZ valve must be installed to protect your facility’s water supply and the residents throughout your area. An RPZ device consists of two independent valves with a chamber in between that monitors water pressure. The valve is designed to ensure a constant flow of safe water even if the pressure fluctuates.


However, these valves don’t last forever. As a result, annual RPZ testing and certification are required. RPZ certification must be performed by a certified technician. A P&D Mechanical certified technician can perform RPZ testing to ensure the valves are working correctly. We can also assess your system for any potential water backflow.


After the test is complete, we submit the results to your municipality.

RPZ Backflow Testing in Minneapolis, Minnesota

You may have recently noticed that your plumbing system is backing up. The backflow could be caused by a faulty RPZ device. If so, we can repair or replace the device and get your plumbing flowing smoothly once again.


To schedule service in Minneapolis, call us at 763-533-2218, or you can message us on our contact page.

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