Here at Backflow Professionals we keep up to date with the latest backflow devices on the market. We work on, install, and test any backflow device that is in service or need of service. Single check, Double check, RP & RPDA Backflow devices are your most common types of devices used on fire sprinkler systems, lawn irrigation systems and on potable water supply for buildings that are required by local code. These devices need to be tested annually once a year. At www.backflowprofessionals.com we are the licensed and insured pros that you would want to insure proper working backflow devices. We have been working in the state of Illinois & Chicago since 1996.


Where Do We Backflow Test?

We test and service the entire state of Illinois:

Test and service ALL types of commercial buildings

  • Hotels
  • Restaurants
  • Medical Buildings
  • Shopping Malls
  • Etc...

Test and service ALL types of residential buildings

  • Apartments
  • Condos
  • Single Family
  • Duplex
  • Etc...

We are a licensed plumbing company who specialize in backflow devices.

Talk to a live person at 1-630-273-1963



Servicing the Chicago land region. Jo-Nan plumbing is a family owned and operated business guaranteeing top quality work and customer service for over 20 years. Starting off as a sewer and water contractor in 1985, Jo-Nan Plumbing began working on new construction commercial projects along with residential. Growing into a full service plumbing shop by 1989. Owner and founder of the company John C. Lesmeister saw BackFlow water prevention as a high priority need for public safety. Ever since, Jo-Nan Plumbing Inc. started specializing in Water Safe, Back Flow Prevention, Installation, Testing, Service, and Repair. One must be a state licensed plumber, have a state licensed plumbing contractor license in the state of Illinois, and also have a C.C.C.D.I. License. NOT ALL plumbers are insured, and licensed to test these devices. Only a plumbing contractor that meets the above requirements can legally test a backflow device in the state of Illinois and Chicago. Don't be fooled by some companies who charge for the price of a licensed plumber but are sending out unlicensed persons.