The plumbing experts at Green Tech Plumbing are trained and licensed to install, test, and repair all types of back-flow prevention devices. We will arrange all the details of the test for you; your tech will finish the inspection paper work and submit it directly to your water authority. We make the whole process as easy as possible. State and local ordinance codes usually require the installation of back flow prevention devices in commercial properties. Some residential properties require it as well if there is a chance of a “back flow” occurrence happening. The size and complexity of the system is unique in every situation. If you need assistance testing or installing a backflow prevention device contact us online or by phone at 847-518-5338 today.


Certified to Test & Install

  • Commercial Backflow Prevention Devices
  • Dual Check Valves
  • Reduced Pressure Zone Valves (RPZ Valves)


A backflow device also goes by the name of RPZ valve. RPZ standing for Reduced Pressure Zone. The device is installed on plumbing systems to protect the public drinking water and the city supply from cross contamination. What is an RPZ Valve? RPZ valves are needed in buildings with irrigation systems, fire suppression systems or large boilers. The valves prevent the backflow of chemicals, stagnant water and bacteria from entering our water supply. The state of Illinois requires the use of an RPZ valve in the plumbing code. All city governments comply with these laws. In addition to requiring a RPZ valve the law also mandates the devices be tested once per year by a licensed professional. Once your valve is tested we submit all the paperwork to the city on your behalf.