Which Backflow Prevention Assemblies Should Be Tested in 2026? 

Why Consistency, Science, and Public Health Must Drive the Answer
There are few topics in the water industry that generate as much agreement — and yet as much debate — as backflow prevention assembly testing. 

Most professionals agree on the basics: 

• Backflow prevention assemblies must be tested when installed 
• They must be tested after repair or relocation 
• They must be tested at least annually 

So far, so good. 

The real disagreement begins with a deceptively simple question: 

Which assemblies should be tested? What the Codes and Standards Actually Say
Model plumbing codes and cross-connection control standards are clear: 

All testable backflow prevention assemblies must be tested. 

This applies to assemblies installed for: 

• Containment protection 
• Isolation protection 
• Commercial installations 
• Residential installations 

If a hazard exists that requires a testable backflow prevention assembly, logic and public-health principles dictate that the assembly must also be tested and maintained. 

Anything less undermines the very reason the assembly was required in the first place. 

If Protection Is Necessary, Testing Is Necessary
This is the point where resistance often appears — particularly when residential properties enter the discussion. 

Yes, it can be difficult to explain backflow prevention to homeowners. Yes, cost is always part of the conversation. 

But the physics of water flow do not change based on property type. 

• Backpressure behaves the same in a house or a factory 
• Backsiphonage does not care if the pipe serves a business or a residence 

Water does not know what the zoning classification is 

Water is a lazy fluid — it follows the path of least resistance. That principle applies everywhere. 

Residential vs. Commercial: A False Divide
One of the most persistent myths in cross-connection control is that residential systems are somehow less risky by default. 

In reality, modern residential properties commonly include: 

• Irrigation systems with fertilizers or pesticides 
• Boilers and hydronic heating systems 
• Pools, spas, and water features 
• Hose connections near chemicals or contaminants 

From a backflow perspective, many residential hazards mirror commercial hazards exactly. 

An irrigation system is an irrigation system — regardless of whether it serves a home or a shopping center. 

The “Grandfathering” Problem
Few concepts create more confusion — and more risk — than grandfathering safety requirements. 

Consider two identical buildings on the same street: 

• One built 20 years ago with a fire sprinkler system protected by a single detector check 
• One built recently with the same system protected by a reduced pressure principle detector assembly 

If the water main loses pressure, does the age of the building prevent backflow? 

Of course not. 

You can grandfather: 

• Fixture counts 
• Insulation requirements 
• Energy efficiency features 

But you cannot grandfather physics — and you should not grandfather public-health protection. 

Lowering the level of protection because a system is “older” does not reduce the hazard. It simply accepts greater risk. 

When Policy Discussions Lose the Plot
Public meetings on backflow ordinances often reveal the same pattern: 

• Agreement that public safety matters 
• Pushback when costs are discussed 
• Attempts to delay, dilute, or exempt requirements 

Well-intentioned officials may look for compromise solutions, but compromise cannot come at the expense of drinking water safety. 

The most dangerous outcome is an all-or-nothing mindset, where: 

• Either everyone is required to comply immediately 
• Or no one is required to comply at all 

Neither approach is effective. 

The correct approach is evaluation, education, and targeted protection. 

Education Is the Missing Piece
Most resistance to testing requirements does not come from malice — it comes from lack of understanding. 

Effective cross-connection control programs rely on: 

• Hazard-based assessments 
• Clear explanations of real risks 
• Consistent enforcement 
• Outreach to property owners and officials 

Some properties may not require testable protection. 
Some absolutely do. 

But those decisions must be based on actual water use and hazard evaluation, not assumptions or political pressure. 

The Role of the Industry in 2026
In 2026, the responsibility extends beyond regulators and utilities. 

Installers, testers, inspectors, educators, and manufacturers all play a role in: 

• Explaining why testing matters 
• Demonstrating real-world backflow incidents 
• Moving away from “one-size-fits-all” thinking 
• Reinforcing that prevention is always cheaper than response 

Cross-connection control is not about creating work — it is about preventing contamination before it happens. 

The Bottom Line
If a backflow prevention assembly is: 

• Testable 
• Installed because a hazard exists 

Then it must be: 

• Tested 
• Maintained 
• Repaired or replaced when it fails 

Anything else is inconsistent, indefensible, and unsafe. 

Protecting drinking water requires consistency, education, and the courage to apply science evenly — whether the pipe serves a factory, a school, or a single-family home. 

That is the work we do. 
And it matters. 

Sean Cleary

Sean Cleary serves as Vice President of Industry Programs and Operations for the IAPMO Backflow Prevention Institute, advancing education and technical training in cross-connection control and backflow prevention. The IAPMO Backflow Prevention Institute helps to ensure that the professionals responsible for protecting drinking water are properly trained and certified. A licensed master plumber with more than four decades of experience, Sean has worked in all phases of the plumbing and mechanical industries, with deep expertise in cross-connection control systems. He is a Past President of the American Society of Sanitary Engineering (ASSE) and served for more than a decade as Chairman of the ASSE Cross-Connection Control Technical Committee. A graduate of the United Association Instructor Training Program, Sean has dedicated much of his career to strengthening professional competency, standards alignment, and technical excellence across the industry. Under Sean’s leadership, the IAPMO Backflow Prevention Institute prepares plumbers, pipe fitters, irrigation techs, sprinkler fitters, HVAC techs, plumbing engineers, inspectors, facility managers to earn and maintain ASSE and other industry certifications through comprehensive training and continuing education offered across the United States and internationally. Sean co-authored the IAPMO Backflow Reference Manual and has contributed to numerous technical publications. Through his work with IAPMO, ASSE, the American Society of Plumbing Engineers (ASPE), and state plumbing inspector organizations, Sean helps ensure that certified professionals are equipped to prevent contamination and safeguard the drinking water systems communities rely on every day.