A lawn sprinkler system doesn’t become exempt from backflow testing because it sat unused this season. If it remains connected to a potable water supply, Illinois rules still require the appropriate protection and testing of covered assemblies.
Illinois requirements apply statewide, but each community administers its own notices, deadlines, fees, and process for submitting test results. Property owners need to understand both the state rules and the instructions issued by their municipal utility.
Illinois Requires an RPZ for Connected Lawn Sprinklers
Under 77 Ill. Adm. Code 890.1140(d), a lawn sprinkler system connected to a potable water supply must have a reduced pressure principle backflow preventer assembly, commonly called an RPZ. The rule applies throughout Illinois, including Cook County communities.
An RPZ is designed to prevent contaminated water from moving backward into drinking water piping. Having an unspecified backflow device isn’t enough because the code identifies an RPZ for a connected lawn sprinkler system.
Some existing systems have a pressure vacuum breaker, or PVB. A PVB and an RPZ are different devices, and the presence of a PVB alone doesn’t establish whether a particular installation meets current requirements. That determination requires review of the device, its installation, and the applicable local program.
Illinois permits an RPZ outdoors only when it’s protected from freezing or removed at the end of the season. Property owners should locate the assembly near the sprinkler connection and make sure seasonal conditions don’t expose it to freeze damage.
Why Backflow Protection Safeguards Drinking Water
A cross-connection is an actual or potential connection between a public drinking water system and a source that could contaminate or pollute it. A sprinkler setup creates this risk because its components operate outdoors while drawing from the property’s water lines.
Changes in pressure can cause water to move in the wrong direction. Sprinkler piping, heads, and nearby soil are exposed to outdoor contaminants, making a properly installed and functioning assembly essential.
The Illinois Environmental Protection Agency requires community public water supplies to maintain active cross-connection control programs. A notice from a village, city, or water district deserves attention even when the sprinklers haven’t been running.
Testing Is Required Even When Sprinklers Go Unused
Covered assemblies still require testing when the sprinkler system wasn’t used during the year. Under 77 Ill. Adm. Code 890.1130, RPZ, RPDA, DCA, and DCDA assemblies must be tested and approved before initial operation and at least annually after the initial inspection.
The inspection determines whether the assembly is operating as intended at that time. It isn’t a one-time installation signoff, and turning off the controller doesn’t replace the testing requirement.
Keep completed testing and maintenance records available at the installation site. Illinois requirements for lawn irrigation records also call for the RPZ type, size, serial number, and inspection date. Complete documentation makes it easier to provide verification when requested.
Device Tests & Property Surveys Serve Different Purposes
A device test evaluates the backflow assembly itself. A property survey is broader and may be used to identify potential connections between drinking water and non-potable sources.
Read any request from your water supplier closely. It may call for an annual test report, a survey response, or both. State law establishes the protection and testing rules, but Cook County municipalities don’t share one form, portal, fee, or due date.
Qualified Inspectors Document the Results
Illinois requires covered assemblies to be tested and approved by a Cross-Connection Control Device Inspector, or CCCDI. This credential identifies an inspector qualified to perform the required work under 77 Ill. Adm. Code 890.1130.
The resulting record should identify the assembly and document the inspection. Verification is submitted to the officials responsible for the community program, but procedures vary. In some communities, the tester submits the results; in others, the property owner must provide the report or follow a designated process.
Before scheduling service, ask your water supplier what documentation it needs and when it’s due. Retain a copy of the completed record even if someone submits the result on your behalf. It can resolve questions raised by a later notice, ownership change, or inspection.
A Compliance Checklist for Cook County Property Owners
Treating the required test as routine sprinkler upkeep makes compliance easier. Before the date on a local notice:
- Identify the assembly connected to the sprinkler system and note whether it’s an RPZ or another device type.
- Arrange testing with a qualified CCCDI.
- Keep the completed test and maintenance record at the property, including the device details and inspection date.
- Follow your community’s instructions for submitting results, responding to a survey, or paying a local program fee.
During backflow testing in Cook County, our certified technicians assess the operating condition of PVBs and RPZs and identify issues that could compromise water safety. We serve residential and commercial irrigation customers in Palatine and surrounding communities, including Arlington Heights, Barrington, Glenview, Schaumburg, Wilmette, and Lake Zurich.
Start with the device type, the completed record, and the instructions from your local water supplier. For residential or commercial irrigation backflow testing, call Conserva Irrigation of Northwest Chicago at (847) 380-8536 to schedule an inspection.
