Backflow Testing & RPZ Inspection in Chicago's North Shore Suburbs

If you own a home or business in Chicago's North Shore suburbs, you've probably received a letter from the village about backflow testing. It may sound technical, but it's simply about protecting your drinking water from contamination. Irrigation systems, boilers, fire sprinklers, and other plumbing connections can allow dirty water to flow backwards into the clean water supply if the pressure changes. RPZ devices are your last line of defense.

Municipalities across the North Shore – including Buffalo Grove, Deerfield, Wheeling, Northbrook, Glenview, Highland Park, Lincolnshire and nearby areas – require regular RPZ testing by a licensed plumbing contractor, a certified CCCDI (Cross Connection Control Device Inspector). In this guide, we'll explain what backflow testing is, why it matters, what happens during an inspection, and how to schedule service before deadlines or violations hit your mailbox.

What Is an RPZ Backflow Preventer?

RPZ stands for Reduced Pressure Zone. It's a special type of backflow preventer installed on water lines that connect to systems where contamination is possible – for example sprinkler systems, hose bibs, commercial equipment, or hydronic heating. Think of it as a one-way safety valve that keeps used or chemically treated water from ever flowing back into the clean water your family drinks and cooks with.

When city water pressure drops (for example during a main break or heavy usage), the RPZ device ensures that water can only move in the safe direction. If something goes wrong inside the device, it will discharge water to a relief port instead of letting contaminants move backward into your home or the public water system.

Why Annual RPZ Inspection Is Required in North Shore Suburbs

Because RPZ valves protect the public water supply, they are regulated by both state plumbing codes and local ordinances. Most North Shore villages require annual RPZ testing and certification performed by a licensed plumber or certified backflow tester. After testing, the results must be documented and submitted to the village or their third-party compliance provider.

Skipping or delaying testing can lead to violation notices, fines, or even water shutoff. The good news is that a proper RPZ inspection is quick, straightforward, and often more affordable than homeowners expect – especially when issues are caught early and repaired before they become major failures.

What Happens During Professional Backflow Testing?

During an appointment, our licensed technician will shut off the water line feeding the RPZ device and connect calibrated test gauges. We carefully measure pressures across each check valve and the relief valve, verifying that all internal parts open and close under the correct conditions. If readings are outside of the acceptable range, we diagnose the cause and recommend repair or rebuild options.

Once the device passes, we complete all documentation required by your village, including test forms, device information, and our license details. Our team can submit the paperwork directly so you don't have to worry about missed deadlines or incomplete records – you simply get a copy for your own files.

Common RPZ Problems in Chicago's North Shore

Local water conditions and weather patterns on the North Shore create a few recurring issues we see every season. Hard water and mineral buildup can cause internal checks to stick. Outdoor or garage-mounted devices can freeze and crack during cold snaps. Irrigation backflow preventers often get clogged with debris after winterization or spring start-up. Left unaddressed, these problems can lead to leaks, nuisance discharges, failed tests, or full device replacement.

Regular testing and maintenance helps catch these issues early. In many cases, a skilled plumber can rebuild the existing RPZ with new internal components instead of replacing the entire assembly, saving you money and downtime.

Repair vs. Replacement: What Makes Sense?

Not every failing RPZ needs to be replaced. If the body is in good condition and the device is reasonably modern, we can often restore it with new springs, seals, and check assemblies. Replacement is typically recommended when the unit is very old, badly corroded, cracked from freezing, or has failed multiple tests in recent years. During your appointment, we'll walk you through the options, expected lifespan, and total cost so you can make an informed decision.

How Much Does RPZ Inspection/ Backflow Testing Cost?

Pricing depends on the type, size, and location of your device, as well as how many backflow preventers are on the property. Most North Shore homeowners fall into a predictable range for a single irrigation or domestic water RPZ test, with additional fees only if repairs or rebuild kits are needed. For multi-family buildings or commercial properties with several devices, we can provide bundled pricing and recurring annual testing schedules.

Simple Tips to Prevent RPZ Issues Year-Round

A few small steps can dramatically reduce failures: winterize outdoor irrigation systems before the first deep freeze, avoid stacking boxes or equipment around indoor RPZ valves, and schedule testing early instead of waiting for the final reminder notice from the village. If you notice constant dripping, unusual noises, or a sudden change in water pressure near your RPZ, call a professional right away.

FAQs About Backflow Testing

How often do I need RPZ inspection?
In most Chicago North Shore suburbs, RPZ devices must be tested every 12 months or whenever they are moved, repaired, or replaced.

Can I test my own RPZ?
No. Municipalities require testing to be done by a licensed plumber or certified backflow tester using calibrated gauges and approved procedures.

What happens if my RPZ fails the test?
We'll explain the cause, provide repair or replacement options, and retest the device after work is completed so it can be certified and reported to your village.

Which areas do you service?
We provide RPZ backflow testing and inspection throughout Chicago's North Shore, including Buffalo Grove, Wheeling, Deerfield, Northbrook, Glenview, Highland Park, Lincolnshire, and nearby communities.

Schedule Backflow Testing in Chicago's North Shore

Whether you just received a village notice or want to stay ahead of deadlines, our licensed plumbers are ready to help. We'll test your RPZ device, handle the paperwork, and make sure your home or business stays compliant and protected.

Schedule Your RPZ Inspection Today