What is backflow prevention?

Backflow prevention is how Michigan homes and facilities protect drinking water from contamination when water flows the wrong direction. Backflow is the undesirable reversal of the flow of water, and it may contain non-potable, harmful substances that can enter a public or individual water system. We’ll explain what backflow prevention is, how it works at a high level, and how Backflow Prevention Services can help with testing, certification, repair, installation, and system design across Michigan.

Why backflow prevention matters

Backflow can lead to dangerous, non-potable substances being introduced into public or private water systems. Unfortunately, incidents can happen without warning, and many are never reported. Backflow prevention helps reduce risk, and Backflow Testing helps verify that protection is working correctly.

How backflow happens

Backflow is caused by:

• Back-siphonage: A sudden decrease in water pressure can create suction, reversing flow and pulling non-potable substances into potable systems.
• Backpressure: Pressure in a non-potable system becomes greater than inlet pressure in a potable system, forcing water to reverse through a cross-connection.

What is a cross-connection?

A cross-connection is any temporary or permanent connection between potable water and non-potable water or substances. Cross-connections can occur in public systems or consumer plumbing systems. If flow reverses, a cross-connection can become the pathway for contamination.

The role of a backflow prevention assembly

A backflow prevention assembly is a valve system designed to allow water to flow in only one direction. Any water system that comes in contact with a possible contaminant requires a backflow prevention assembly to help isolate it from the public water supply.

You may also see the term “device” in searches. People often search using “device,” but a testable unit is more accurately referred to as an assembly in customer-facing explanations.

Backflow testing and certification

Backflow preventers need to be tested regularly per plumbing code and local requirements. Michigan Plumbing Code requires testing regularly, in most cases annually. Requirements can vary by city and application, and some may be on longer intervals such as three or five years. Residential schedules can vary by application, such as every three years on irrigation and yearly on isolation assemblies.

Backflow Prevention Services tests residential and commercial assemblies and provides certification documentation to the appropriate authorities on your behalf.

Serving Michigan communities

Backflow prevention needs do not stop at city limits. Backflow Prevention Services supports customers across Michigan, including communities like Farmington, Oxford, Ann Arbor, Oak Park, and Clawson.

FAQ 

What is backflow prevention?
Backflow prevention uses backflow prevention systems and assemblies to help stop contaminants from entering potable water through cross-connections.

Is backflow prevention only for commercial buildings?
No. Residential systems can also have cross-connections, such as irrigation, pools, and other fixtures connected to the water line.

How do I know if I need Backflow Testing?
If your property has a backflow prevention assembly, testing may be required on a schedule set by your local authority.

Do you submit certification documentation?
Yes. Backflow Prevention Services provides certification documentation to the appropriate authorities on your behalf.

If you need Backflow Prevention support in Michigan, schedule Backflow Testing with Backflow Prevention Services. We test assemblies, provide documentation, and can support repairs, installation, and system design when needed.

“What is backflow prevention” has a practical answer: it is how properties reduce the risk of contaminants entering potable water when flow reverses through a cross-connection. Backflow prevention assemblies help keep flow moving in one direction, and Backflow Testing helps verify performance and documentation. 

Schedule service with Backflow Prevention Services to protect drinking water and stay organized with compliance requirements. Call 1-877-290-4003 today!