Backflow Prevention Testing

How Is Backflow Testing Performed? | Water Pressure Tips

Backflow prevention testing is a process performed by certified professionals to ensure that backflow prevention devices are functioning correctly to stop contaminated water from reversing flow and entering the potable (safe) water supply. It involves using specialized equipment to test the device's pressure levels and valve operation. These tests are usually required annually by local authorities to protect public health and maintain the integrity of the water system.

What is Backflow and Why is it Prevented?

• Backflow

occurs when water reverses its intended flow, moving from the contaminated side of a cross-connection back into the clean water system. 

• Cross-connection

is an unprotected link between a potable water source and a non-potable (dirty) source, such as an irrigation system or sewer line. 

• Contamination

from these sources can include chemicals, pesticides, human waste, or other harmful substances that pose a health risk to the public.

How Backflow Prevention Testing Works

1. Inspection: 

A certified tester inspects the backflow prevention device, which is a one-way valve system designed to prevent backward flow. 

2. Equipment Setup: 

A special test kit is attached to the backflow preventer. 

3. Pressure Testing: 

The tester measures the pressure at different points in the system to ensure the valves are operating correctly and blocking reverse flow. 

4. Functional Check: 

The tester also checks if the check valves are working properly, allowing water to flow one way but blocking it from flowing in the opposite direction. 



5. Reporting: 

If the device is functioning correctly, the tester issues a certification report that is submitted to the local water authority. 

Why is it Important?

• Public Health:  

Ensures the safety of your drinking water by preventing contamination from non-potable sources.  

• Regulatory Compliance:  

Local plumbing codes often require annual backflow testing, and failure to comply can result in fines or water shutoff.  

• System Integrity:  

Regular testing helps maintain the integrity of the entire plumbing system by ensuring that backflow preventers are in good working order. 

What Happens if a Test Fails? 

• If a backflow preventer fails the test, it needs to be repaired or replaced by a qualified plumbing professional.
• After repairs or replacement, the system must be retested to ensure it is working correctly.