How to Prep for Your Annual Backflow Test in Illinois

If you're a homeowner or business owner in Illinois, staying compliant with backflow testing requirements is key to protecting your property and your local water supply. Annual backflow prevention device testing helps ensure contaminated water doesn't reverse flow into clean water lines—a serious health hazard if left unchecked.

In this post, we’ll walk you through how to prepare for your backflow test so it goes smoothly, meets your city or village’s regulations, and avoids costly delays or rescheduling.

What Is a Backflow Test?

A backflow test is an inspection performed by a licensed and certified backflow tester to verify that your backflow prevention device is functioning correctly. These devices are typically found on:

• Irrigation systems

• Fire sprinkler systems

• Commercial and industrial plumbing systems

In many areas—including Lake County, Illinois—annual testing is required by local municipalities or water providers.

1. Locate Your Backflow Preventer

Start by identifying where your backflow device is installed. It’s commonly located:

• Outdoors near your irrigation system or water meter

• Inside a utility or mechanical room (in commercial properties)

• In or near fire protection systems

Knowing the exact location helps both you and your backflow tester get started faster.

2. Clear Access to the Device

To perform a proper backflow test, your technician needs clear access to the device. Make sure to:

• Trim bushes or landscaping if it’s outside

• Remove snow or debris

• Unlock any gates, rooms, or enclosures around the device

This ensures the testing equipment can be connected without obstacles.

3. Confirm the Water Supply Is On

Backflow testing requires water pressure to measure performance. If the system is turned off (often the case in winter), turn it back on before your scheduled test.

If you’re not sure whether your system is active, your landscaper or maintenance crew can assist.

4. Notify Tenants or Staff (If Applicable)

If your backflow device is in a shared space or could cause a brief water interruption, let others know in advance. This applies to:

• Apartment buildings

• Office complexes

• Commercial tenants

Proactive communication helps avoid complaints or confusion during the service window.

5. Look for Visible Damage or Leaks

Take a quick visual inspection around the device. If you notice:

• Leaking water

• Rust or corrosion

• Cracks (common after freezing temperatures)

…it’s best to report this before testing. Damage can prevent the test from being completed and may require repairs first.

6. Hire a Certified Backflow Tester in Illinois

In Illinois, backflow testing must be done by a state-certified backflow prevention tester. At Lake County Backflow, we’re fully licensed, insured, and specialize in testing for:

• Irrigation backflow systems

• Fire protection systems

• Commercial and industrial plumbing

We handle test submission, documentation, and reminders for future tests to keep you in full compliance.

Why Backflow Testing Is Important

• Protects your drinking water from contamination

• Keeps your property compliant with local ordinances

• Avoids fines or service interruptions

• Identifies problems early, before they become expensive

Final Thoughts

Your annual backflow test doesn’t need to be stressful. A little preparation goes a long way in keeping your water safe and your plumbing systems running smoothly.

Need to schedule your backflow test in Lake County, IL or nearby areas?

✅ Contact Lake County Backflow today to book your inspection or get answers to your questions. We’re here to make the process easy, professional, and fully compliant.