RepairUpdated June 21, 2026
Backflow happens when water flows in the wrong direction inside a plumbing system, allowing contaminants from the commercial property side to enter the clean municipal supply. In Lincolnshire, where businesses rely on Lake Michigan-sourced water, backflow prevention isn't optional. It's a requirement to protect both your operation and the broader community. Our team works with local businesses to keep systems safe, efficient, and compliant with backflow testing and repairs.
Why Backflow Prevention Devices Matter
Physical hazards like boiler chemicals, cleaning agents, or even landscape irrigation systems can quickly become health risks if a pressure change pulls "used" water back into the potable system. The humid climate in the north suburbs and access to municipal water make strict backflow prevention especially important for commercial buildings, especially those with complex supply lines or equipment tied to the water system.
Illinois law and local codes require approved backflow prevention assemblies in many business applications. These devices, like reduced pressure principle assemblies (RPZs), double check valves, and pressure vacuum breakers, must undergo regular inspection and testing by a licensed plumber. Without this testing, both your business and customers are at risk.
Common Trouble Spots in Lincolnshire Buildings
We see several factors in local commercial plumbing that affect backflow prevention, especially considering the strong commercial base with employers like Aon Hewitt and Zebra Technologies. Buildings with older plumbing, multiple pressure zones, or extensive irrigation systems need particular attention. Some properties along Half Day Road or near the Des Plaines River may have additional risk due to changing water tables or renovation work disturbing old supply lines.
Typical risk points include:
- Cross-connections between potable and non-potable systems (such as an irrigation line or fire suppression feed).
- Old, corroded supply lines that haven't been updated since the building's original construction.
- Poorly maintained or incorrectly installed backflow prevention assemblies.
- Pressure fluctuations caused by heavy water usage, such as during landscaping or industrial cleaning.
When we assess a property, we look at the age and type of piping, previous repairs, and whether recent remodeling affected the plumbing layout. Our crew also pays attention to basement systems, as uneven settling from the area's loamy soil can strain buried pipes and valves.
Signs Your Backflow Device Needs Repair or Testing
Backflow preventers rarely fail without warning. Several clues tell you it's time to call in a licensed plumber for a checkup or repair. Watch for these warning signs:
- Visible leaks or water pooling around the device or supply line.
- Strange noises, whistling, vibrating, or unexpected water hammer when running equipment.
- Unexpected drop in water pressure throughout parts of the building.
- Stale, cloudy, or off-tasting water at fixtures downstream of the device.
- Annual inspection date has passed, or you're unsure when the last test took place.
Any one of these issues can signal a backflow device that's failing or out of compliance. Backflow assemblies are mechanical. Like any valve or pump, they eventually wear out or get blocked by mineral buildup, especially in systems running moderately hard water like ours.
What's Involved in a Backflow Test?
Certified testing isn't a quick glance. We follow a step-by-step process, using specialized gauges to check the integrity and performance of each assembly. Our typical test includes:
- Shutting off water temporarily to isolate the backflow device.
- Attaching test gauges to measure pressure differentials.
- Checking shutoff valves for leaks and proper closure.
- Evaluating relief valve and check valve operation at both high and low system pressures.
- Documenting results for village records and providing a written report for your files.
If we find problems, we'll discuss repair or, if needed, replacement options. Malfunctioning backflow preventers sometimes go hand-in-hand with other hidden problems, like undetected supply leaks or clogging from hard water scale.
How Backflow Testing Keeps Your Business Compliant
Lincolnshire, like most of Lake County, enforces strict local plumbing standards. Annual or sometimes even semi-annual backflow testing is required for most businesses, especially those with irrigation, fire suppression, boilers, or food service. Neglecting this requirement can lead to fines or forced water shutoff.
When you schedule testing with us, our licensed plumbers file the results with the village so you stay up to code. We also flag any other issues we spot, whether it's aging supply lines needing repiping or a sump pit valve showing signs of wear. Staying proactive with required testing often catches other developing problems long before they become emergencies.
Related Commercial Plumbing Services
Backflow prevention is one part of keeping your business's plumbing reliable and safe. Our team handles all types of commercial plumbing repairs and upgrades, from supply line issues to fixture installations. If a leak or water quality problem is traced to the main or branch lines, we have the crew and equipment to solve it quickly. We also provide water line services to replace failing pipes, and full sewer line repair if a blockage or break is affecting your property's drainage.
If your annual test is due or your device is showing warning signs, call us at 224-524-1213. Our local crew is ready to keep your water safe and your business running without interruptions.