Reduced Pressure Backflow Preventer (RPZ)
What is a Reduced Pressure Backflow Preventer (RPZ)?

  • A RPZ is a type of backflow device that protects drinking water in your
    home or business and the city water supply from contaminants.

Why do I need an RPZ Device?

  • The RPZ Device prevents back pressure and back siphonage (if
    reduced pressure exists in the supply piping allowing undesirable
    substances to be drawn into the drinking water supply).
  • Contaminants can enter an irrigation system from fertilizer or pesticides
    that are sprayed on lawns.
  • If there is a water leak in the house, house water service break, city
    water main break, or hydrant flushing, the water pressure can drop,
    causing systems to back up into the drinking water supply. If this
    occurs, the RPZ will open up, and dump water out rather than allowing
    potentially contaminated water to backflow into the drinking water

Why do I need to get my RPZ Device tested each year?

  • Illinois State Law requires the use of an RPZ as outlined in the Illinois
    State Plumbing code and Illinois Environmental Protection Agency. All
    city governments must comply with these laws. The law not only
    requires the use of an RPZ device but that the device must be
    tested once every year. Only a licensed plumber with a Cross
    Connection Certification License can test and certify the proper
    operation of an RPZ valve. Once the RPZ is tested, the certification
    paperwork will be forwarded to the city or village. Your RPZ valve
    must be installed and the water must be turned on from inside
    the house in order to test the valve.

                            Learn more about your RPZ Device here
28322 Ballard Drive ~ Lake Forest, IL 60045 ~ Phone: 1-847-281-9400 ~ Fax: 1-847-281-9780 ~ E-mail:
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Halloran & Yauch, Inc. - Updated 4/23/14