How Often Is Backflow Testing Required in Indiana?

In Indiana, backflow prevention assemblies must be tested once per year — annually — for most commercial, irrigation, and fire line connections. This is the universal standard across all Indiana water utility cross-connection control programs. Here is a complete breakdown of when testing is required, what triggers additional tests, and how to stay on schedule.

The Annual Testing Standard

The annual testing requirement applies to the vast majority of backflow prevention assemblies in Indiana. Your water utility sets your specific annual due date — this is typically tied to one of three factors:

• Installation date anniversary — your test is due 12 months after the original installation date, then every 12 months thereafter
• Utility-standardized dates — some utilities set a single due date (such as April 1 or October 1) for all accounts in their program
• Service type cycles — some larger utilities stagger due dates by service type (irrigation, fire, commercial) to distribute workload across the year

Your annual compliance notice or utility bill will typically include your due date. If you’re unsure, contact your water utility directly — they can look up your account and tell you exactly when your test is due.

What Triggers Additional Testing

Beyond the standard annual test, additional testing is required in the following circumstances:

New Installations

Any backflow prevention assembly that is newly installed must be tested and produce a passing test report before being placed into service. This initial test confirms the device was installed correctly and is functioning properly. After the initial test, annual testing continues on the schedule set by your water utility.

After a Failed Test

If your assembly fails its annual test, the following sequence is required:

1. The failing assembly must be repaired or replaced by a licensed plumber
2. After repair or replacement, the assembly must be re-tested by a certified tester
3. The passing re-test report is submitted to your utility

The re-test does not reset your annual testing clock. Your next annual test is still due on the original schedule — which may be as soon as a few months after the re-test if the failure occurred late in your compliance year.

After Repair or Replacement

Whenever a backflow prevention assembly is repaired, rebuilt, or replaced — for any reason, including normal maintenance — it must be re-tested to confirm proper function before being returned to service. This applies even if the repair was not triggered by a test failure.

Change of Use or Modification

If your property’s hazard level changes — for example, if you begin using chemical injection in an irrigation system, or change from a low-hazard commercial use to a high-hazard use — your utility may require an upgraded assembly and re-testing.

High-Hazard Connections

Some industrial, chemical, or medical facilities may be required to test more frequently than annually. Your utility’s cross-connection control ordinance or program document will specify any increased frequency requirements for high-hazard connections.

Seasonal Considerations

Indiana’s climate creates some practical scheduling challenges for backflow testing:

• Irrigation systems — if your irrigation system is winterized and the backflow assembly is shut off from October through April, testing is typically performed at startup in spring. Confirm with your utility whether they require testing at activation or at a fixed calendar date.
• Cold weather testing — backflow assemblies installed in unprotected outdoor locations may be unavailable for testing in extreme cold. Work with your tester to schedule during accessible weather, or have the assembly relocated to a protected location.
• High-demand seasons — certified testers are busiest in spring (irrigation startup) and fall (pre-winterization). Schedule early to avoid end-of-season backlogs that could push you past your due date.

Consequences of Testing Late

Missing your annual testing deadline has real consequences in Indiana. Utilities escalate enforcement in stages:

1. Reminder notice — sent near your due date as an advance reminder
2. Past-due notice — sent if no test report is received by the due date
3. Non-compliance notice — sent after a grace period (typically 30 days) with a firm deadline
4. Service interruption — utilities may shut off water service to properties that remain non-compliant after the stated deadline

Service interruption is increasingly common as utility programs mature and enforcement is automated. If you receive any compliance notice, act immediately — schedule a test, get it done, and confirm the report was submitted to your utility.

How to Stay on Schedule

The most effective way to stay on schedule is to schedule your annual test early — at least 30 days before your due date. This gives you buffer time if the tester finds a failure requiring repair and re-testing before your deadline.

Practical tips:

• Add your annual due date to your calendar with a 60-day advance reminder
• Use a certified tester who handles report submission directly to your utility
• Keep copies of all test reports for at least three years
• Update your tester contact information if your tester changes their certification status or moves outside your service area

Use this directory to find a certified tester near you who serves your city or county and has experience with your utility’s reporting requirements.