Backflow prevention testing is one of those plumbing tasks many property owners only hear about when they receive a notice, schedule an inspection, or install a new irrigation system or commercial plumbing system.
If you've recently received a testing requirement from your local water authority, you may be wondering what it means and what happens next.
This guide explains who may need backflow prevention testing, what occurs during a backflow test, and what questions to ask before hiring a certified tester. Because requirements vary by municipality and water provider, Albuquerque, Rio Rancho, Santa Fe, and smaller New Mexico communities may follow different backflow prevention program rules.
Regardless of location, backflow prevention testing plays an important role in protecting the public drinking water supply and maintaining compliance with local cross-connection control requirements.
Who Typically Needs Backflow Prevention Testing?
The practical answer is simple: if your water provider or local authority sends a testing notice, your property likely has an approved backflow prevention assembly that must be inspected and tested by a certified tester.
Backflow prevention testing is commonly required for:
- Commercial and industrial properties
- Restaurants and food service facilities
- Medical facilities, dental offices, and laboratories
- Salons and businesses with chemical connections
- Schools and educational facilities
- Buildings with irrigation systems connected to potable water systems
- Fire sprinkler systems
- Multifamily housing and mixed-use properties
According to the ABCWUA Cross Connection and Backflow Prevention Program, certified testers must inspect and test backflow prevention assemblies using approved testing protocols and submit reports to the Cross Connection Control Office.
It is also important not to assume residential properties are exempt. A residential irrigation system, water treatment equipment, or other specialized plumbing connections may create a cross-connection that requires an approved backflow prevention assembly.
Requirements depend on local authority rules, hazard classifications, and the potential contamination risk posed to the public water supply.
4 Common Backflow Prevention Device Types
Not every property uses the same backflow preventer. The appropriate device depends on the level of hazard, the plumbing installation, and local cross-connection control requirements.
Some common backflow prevention devices include:
- Reduced Pressure Principle Assembly (RP/RPZ): Often installed where higher-hazard conditions exist, these prevention assemblies provide protection when chemicals, contaminants, or process water could threaten the potable supply.
- Double Check Valve Assembly (DCVA): Commonly used in lower-risk applications where local authorities permit its use. These assemblies use check valves to help maintain water flow in one direction.
- Pressure Vacuum Breaker (PVB): Frequently associated with irrigation systems and helps prevent contaminated water from being pulled backward into the drinking water supply during negative pressure events.
- Atmospheric Vacuum Breaker (AVB): A mechanical device installed at specific fixtures or connections to protect against backflow in certain applications.
Device selection should always follow local code requirements, hazard classifications, and water authority regulations. Property owners should avoid choosing a backflow device without a professional evaluation.
What Happens During a Backflow Prevention Test?
Backflow testing follows established testing protocols designed to verify that a backflow prevention assembly is working correctly and capable of protecting the water supply.
Step 1: Confirm the Device and Property Details
The tester begins by confirming the device location, size, type, serial number, and property information. This helps ensure the correct assembly is being tested and that documentation matches the local authority's records.
If the listed assembly cannot be located, is inaccessible, or differs from the records on file, the tester may need to document those findings before proceeding with the test.
Step 2: Visually Inspect the Assembly and Installation
Before connecting test equipment, the tester performs a visual inspection of the installation.
They check for leaks, damaged valves, missing components, accessibility concerns, and any conditions that could affect testing. If landscaping, storage items, locked gates, or equipment block access to the assembly, testing may need to be rescheduled.
Before scheduling testing or installing a backflow prevention assembly, it's worth reviewing the ABCWUA Cross Connection Prevention and Control Ordinance, which outlines the standards designed to help protect Albuquerque's drinking water supply.
Step 3: Perform the Field Test with a Test Kit
The certified backflow tester uses a calibrated test kit connected to designated test cocks on the assembly.
Depending on the backflow prevention device type, the test may evaluate check valves, relief valves, shutoff valves, pressure performance, and other operating components. During the process, water service may need to be temporarily interrupted.
The goal is straightforward: verify that the mechanical device can prevent backflow if water pressure changes unexpectedly. Situations such as a water main break, pressure drop, or atmospheric pressure imbalance can cause water to flow in the wrong direction.
When backflow occurs, contaminants, chemicals, pollution, or groundwater could potentially enter potable water systems.
Step 4: Record Pass/Fail Results and Submit Reports
After testing is complete, the results are documented as either pass or fail.
If the assembly passes, the required report is submitted to the local authority overseeing the backflow prevention program. In Albuquerque, certified testers are required to submit accurate reports to the Cross Connection Control Office within required timelines.
If the assembly fails, repairs, replacement, or corrective work may be necessary before retesting can occur. Property owners should always request a copy of the test report for their records and future annual testing requirements.
What If Your Backflow Device Fails Testing?
A failed test does not automatically mean a complete system replacement is required. It simply means the assembly did not meet the required performance standards during the inspection.
Depending on the condition of the backflow preventer, common next steps may include:
- Cleaning internal components
- Replacing worn rubber components
- Repairing valves or check valves
- Correcting installation or accessibility issues
- Replacing the assembly if repair is not practical
- Retesting and submitting updated documentation
The appropriate repair depends on the device type, condition, parts availability, and local program requirements.
For example, if a restaurant's irrigation system backflow prevention assembly fails shortly before a compliance deadline, addressing repairs and retesting quickly can help avoid ongoing administrative issues and reporting delays.
What to Ask Before Hiring a Backflow Tester
Not all plumbers are certified backflow testers. Before scheduling service, ask a few important questions:
- Are you certified to test backflow prevention assemblies within my local authority's program?
- Are you licensed to perform repairs or replacement if the assembly fails?
- Will you submit the required report on my behalf?
- Is your test gauge calibrated and current?
- How long will the water supply be shut off during testing?
- What happens if the assembly does not pass?
- Can you provide documentation for my records?
These questions help property owners understand expectations and avoid surprises.
If you've received a notice, it is best to schedule testing before your deadline rather than waiting until a failed inspection or missed reporting date creates additional challenges.
Schedule a Backflow or Plumbing Evaluation Before the Deadline
Backflow prevention requirements can vary depending on your property type, water provider, and plumbing system. If you've received a testing notice or aren't sure whether your assembly meets local requirements, having a licensed plumbing professional evaluate the system can help clarify your next steps.
First Rate Plumbing Heating & Cooling works with homeowners, property managers, and businesses throughout New Mexico to assess plumbing systems, identify potential concerns, and provide recommendations when repairs or upgrades are needed.
The team focuses on clear communication, honest recommendations, and helping customers understand their options so they can make informed decisions about their plumbing systems.
For more information about our plumbing services, schedule service online or call 505-859-4329 to speak with a member of the First Rate PHC team.
Frequently Asked Questions
What is backflow prevention testing?
Backflow prevention testing confirms that a backflow prevention assembly is operating correctly and helping protect potable water from reverse-flow contamination risks.
Who needs backflow testing in New Mexico?
Requirements vary by local authority, property type, and plumbing hazards. Commercial buildings, irrigation systems, fire sprinkler systems, and properties with higher-risk connections commonly require testing.
How often does a backflow preventer need testing?
Many backflow prevention programs require devices to be tested annually. However, the exact testing schedule depends on local authority requirements and the type of assembly installed.
What happens if a backflow device fails?
A failed test may require repair, cleaning, replacement of worn parts, correction of installation issues, or complete assembly replacement. The device must typically be retested afterward.
Can any plumber test a backflow preventer?
No. Backflow testing is generally performed by a certified backflow prevention assembly tester who meets the requirements of the local authority administering the program.
