Irrigation System Backflow Device Testing

Backflow testing is an important process, required by state law, for all homes with an irrigation system connected to a municipal water supply. The testing is required every three years and properties that are required to test this year will receive a letter from the Water Department—set to be mailed out on April 8th. Property owners are required to obtain a contractor to perform this testing which ensures that lawn chemicals do not enter the public water system.  

The backflow test is a procedure ensures that the backflow device in irrigation systems functions correctly, preventing the reverse flow of water from lawns, which may contain fertilizers or chemicals, into home plumbing and the broader public water infrastructure.  

Here’s a sample letter and a testing schedule map.  

You've received a letter from the Water Department regarding backflow testing and your home has an irrigation system connected to a municipal water supply—what's next? Here are the steps to follow: 

STEP 1: Locate a State Approved Certified Backflow Tester. Plainfield Township Water Department does not conduct the testing of the backflow devices, nor can a certified tester be recommended to you. Certified testers can be found with most plumbers and lawn irrigation companies. We suggest contacting several to get the best pricing available. 

TIP: Over the past years, many residents have reported that grouping testing together with neighbors has provided discounted pricing. Reach out to your neighbors and group together! 

STEP 2: Schedule Your Appointment 

Schedule a date with the tester you have chosen to have your backflow prevention assembly(s) tested prior to the required due date on your notice. Fill in your name/phone number/address on the orange testing form that you received in the mail. Present the form to your tester and the tester will complete the rest of the form. 

STEP 3: Submit Your Test Results Within Deadline Date Requirements (contractor/residential submittal via email, United Postal Service mail or drop off at Water Department or Township offices.) If you have additional questions, please contact our cross-connection personnel at 616-363-9660. 

NOTE: Compliance can only be achieved if the test results are passing or your tester/plumber indicates the supply has been disconnected and the backflow assembly(s) have been removed. You will continue to receive notification if the results equal failure and/or repairs are necessary. 

QUESTIONS?  Contact our cross-connection personnel at 616-363-9660 Monday through Friday 7:30AM to 4:00PM