Reduced Pressure Zone

RPZ Certification Service in Glendale Heights
  • Installation and repair of RPZ devices
  • Testing and certification of devices
  • Annual reminders of required PRZ testing
Since 1999

RPZ Certification, Installation & Maintenance Service

Backflow Testing &  RPZ Certification Service in Glendale Heights, Illinois.

MAS Plumbing is fully certified to install and maintain your RPZ device. An RPZ, also known as the Reduced Pressure Zone device, is essential in keeping the drinking water supply in your property safe from backflow contamination. In Glendale Heights, it is required by law to get the backflow tested annually to ensure public safety. The highly-trained technicians at MAS Plumbing are registered with the Illinois EPA Division of Public Water and are available to install and maintain all RPZ devices. Contact us today to schedule your RPZ certification, repair, or maintenance service.

Backflow preventer tests are required annually in almost all towns and villages in the Chicagoland area, including Glendale Heights.

Let MAS Plumbing handle the testing of the backflow, and make sure that your backflow prevention device is working properly. As per Illinois law, your backflow device needs to be certified. You don’t want contaminated water getting into your kitchen or bathroom. You can trust MAS Plumbing to make sure everything is running properly and for the installation of a device if one is needed. Learn more about our Commercial Plumbing Services and New Construction Services. Same-day RPZ service is available in Glendale Heights, Illinois, call us today!

How Does an RPZ Device Work?

The RPZ device consists of two independent check valves with a pressure monitored chamber between them. The chamber is maintained at a pressure that is lower than the water supply pressure, but high enough to be useful downstream. The reduced pressure is guaranteed by a differential pressure relief valve, which automatically relieves excess pressure in the chamber by discharging to a drain. 4 test cocks are installed to allow an inspector to verify the proper operation of the valve with a differential pressure meter. Two gate valves (one before and one after the RPZ) are provided to allow for testing and repair.

The experienced team of technicians we have here at MAS Plumbing extends far beyond the professional installation of essential RPZ valves. In fact, our team can provide all the required testing and certification of RPZ valves for both residential and commercial use. During the RPZ certification process for your property, one of our licensed plumbers will create inspection reports to be submitted to the Glendale Heights, Illinois area water authority.



Backflow Testing & RPZ Certification Service Available In:

Glendale Heights, Carol Stream, Glen Ellyn, Bloomingdale, Villa Park, and more surrounding areas.

Project: RPZ Certification
The quality of work was very precise, clean, and professional.
Their office was exceptional with corresponding by calling me back & through text messages.
The Estimate went smooth with no pressure and welcomed my input on any ideas about the scope of work involved and any questions that I had.


I can not say enough about Mas plumbing! The entire crew was extremely professional and inspections were passed on the first try! Which is usually rare. They are always on time and will show up! Their work is impeccable and very clean.


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