Serving Our Community for 100 Years
Backflow Service Providing Exceptional Service Since 1921

Des Plaines Backflow Service

Serving Businesses throughout Cook County

The Safe Drinking Water Act requires backflow prevention assemblies installed in areas where there are potential hazards of cross-contamination of potable water. Annual testing is required to ensure the device is functioning properly. If you need one scheduled, Bishop Plumbing, Heating and Cooling, Inc. provides comprehensive backflow service in Des Plaines and throughout Cook County.

Contact us at (847) 380-8053 to book an appointment for backflow testing.

How Backflow Happens

Backflow occurs when contaminated water reverses direction. This can be caused by back pressure or back siphonage, which happens when the pressure in the pipes exceeds the pressure coming into the pipes. Negative pressure in a pipe is known as back siphonage. Regardless of the cause, backflow can contaminate drinking water and result in potential health hazards.

Backflow Prevention

Our licensed plumbers are dedicated to protecting the public health. We can perform a detailed assessment to determine if your home or business is susceptible to backflow. We can recommend backflow assemblies that are suitable for your property. While homes may benefit from these devices, two types of backflow assemblies are required for businesses.

These include:

  • External backflow assemblies – These assemblies are designed to prevent cross-contamination of the city water from a property.
  • Internal backflow assemblies – This is designed to protect the drinking water on your property from a hazardous cross connection.

All our new backflow device and assembly installations are covered by a one-year warranty for parts and labor.

Schedule Your Backflow Testing Today

Annual testing is required for backflow assemblies. Bishop Plumbing, Heating and Cooling, Inc. performs annual backflow service in Des Plaines for many businesses. We even contact our customers to remind them of the upcoming recertification date each year, so you won’t have to worry about forgetting. You can rely on our technicians to perform the required testing and ensure your business is in compliance with local codes and regulations.

Call (847) 380-8053 for backflow assembly installation or testing, or contact us online to request an appointment.


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  • Would definitely use them again!

    “Excellent service, they were on time and explained everything that they were doing. Had to have a shut-off valve replaced, and it was done in a timely fashion and did not have to worry about being ...”

    - Jaison I.
  • Bishop Plumbing will always be my go-to plumbers!

    “Joe showed up on time and ready to go. He not only fixed my problem but was also able to provide some solutions for other problems I had and willing to spend the extra time fixing everything with the ...”

    - Don and Chris C.
  • He was also very efficient and the job took less time than anticipated.

    “Bryan was a very helpful and informative technician. He took the time to explain what was going on and what all of our options were. He was also very efficient and the job took less time than anticipa ...”

    - Erica M.
  • The staff at the office was also courteous and efficient.

    “Ron rodded out our drain line after water and crud had come up through the drain. Ron was professional and efficient. He quickly investigated and resolved our issue. The staff at the office was also ...”

    - Caroline Y.
  • He was courteous and knowledgeable

    “Had a great experience with the technician Dan Brace. He was courteous and knowledgeable. The installation of our sink went smoothly. When I called to book the appointment, they got me in immediately. ...”

    - Gena K.