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Backflow Prevention

The City of Derby water cross-connection control rules comply with federal and state law to require backflow prevention devices for lawn sprinkler systems. Cross connections are points at which the drinking water supply is interconnected with hazardous liquids, gases or other unsafe substances. The rules and regulations were established by the Kansas Department of Health & Environment in accordance with the Federal Safe Drinking Water Act. According to City policy, commercial systems must be tested every year and residential systems tested every two years.

Backflow Device Test Report
Print, fill out and email to or drop off at City Hall.

What is a backflow prevention device?

Backflow prevention devices are mechanical devices that protect drinking water from hazardous contaminants found in lawn sprinkler systems (herbicides, pesticides, fertilizers, bacteria, and organisms), which may originate in the soil around sprinkler heads. Backflow prevention devices are installed where the water line comes into your house to prevent water from flowing backwards. When drinking water is pulled through the main line (when you use your sink, toilet, etc.), it can siphon water through one of your branch lines (sprinkler system line). When the water is siphoned, it pulls whatever is in the line with it. In a sprinkler system, herbicides and pesticides can be siphoned through the drinking water system through sprinkler heads. A backflow prevention device prevents water and contaminants from getting through.

Who needs a backflow prevention device?
Any resident or business with a lawn sprinkler irrigation system connected to the drinking water supply. If you have a private well not connected to the drinking water supply, you are not required to have a backflow prevention device. Please call the City at 788-1424 to update your records.

How do I register my backflow device?
You are required to have a Certified Backflow Installer/Tester inspect your backflow device. On completion of the inspection, your contractor should submit your test results to the City. If you do not have a lawn service contractor, a list of qualified providers may be obtained by calling the City at 788-1424 or see List of Certified Testers.

How do I know if there is a problem with my water?
If you notice a change in the smell, color, taste or presence of foreign objects in your drinking water, call the City immediately at 788-1424, or call 788-1557 after regular business hours to notify the Derby Police Department. Why call the police? Because these signs indicate a possible leak in the water system, which would affect you and your neighbors. If you have questions, please call 788-1424.

City of Derby
City of Derby
611 Mulberry Road
Suite 300
Derby, KS 67037-3533
Ph: 316-788-1519