Backflow Prevention Program

To protect Wheaton’s drinking water system, the City has an active backflow prevention program. This program, in accordance with Illinois Environmental Protection Agency regulations, requires businesses and residents to have backflow prevention devices in place wherever there is a potential for contamination or pollution of the City’s water system through backflow. The most common device is a Reduced Pressure Zone (RPZ) backflow preventer, which is required on all underground lawn sprinkler systems.

Annual Testing Required

If you have a backflow prevention device in your home or business, the device must be tested annually. Backflow preventers on residential lawn irrigation systems require testing when the system is turned on for the season.

You are not required to wait for a letter from the City prior to scheduling device testing. Backflow certifications may be completed by the contractor using forms from either the City or the contractor.


Submit completed backflow certification forms:

  • By email
  • By mail:
    City of Wheaton
    Attn: Water Division
    303 W Wesley Street
    Wheaton, IL 60187

In addition, the Illinois Environmental Protection Agency (IEPA) requires that all water systems conduct a biennial survey of the water system to determine where cross-connections exist.