When Is Backflow Testing Needed?
July 31, 2026

Signs It's Time for Backflow Testing


Your plumbing system helps protect your family, employees, and the public water supply. One important part of that protection is a properly functioning backflow prevention device. Regular backflow testing ensures the device is working correctly and prevents contaminated water from flowing back into the clean water supply.


If you own a home or commercial property with a backflow prevention device, understanding when backflow testing is required can help you avoid compliance issues while protecting your drinking water. D & L Plumbing provides certified backflow testing and backflow repair services. Our certified technicians can test, repair, install, and submit required testing documentation directly to the appropriate municipality. 


What Is Backflow Testing?


Backflow occurs when a sudden change in water pressure causes water to flow in the opposite direction. If this happens, contaminants such as fertilizers, chemicals, bacteria, or other pollutants may enter the potable water supply.


Backflow testing is performed by one of our certified technicians to verify that your backflow prevention device is operating properly. During the inspection, the technician will check the valves and internal components to ensure they will stop contaminated water from entering the public water system if pressure changes occur. Annual testing is required in many Ohio municipalities to help protect public health. 


Situations That Require Backflow Testing


While requirements vary depending on your municipality and property type, backflow testing is commonly needed in several situations.


Annual Testing Requirements

Many residential and commercial properties equipped with backflow prevention devices must undergo annual inspections by certified testers. This helps verify that the device continues to function properly and complies with local regulations. 


After Installing a New Device

Whenever a new backflow preventer is installed, testing should be completed to confirm that the installation meets plumbing codes and the device is operating correctly before it is placed into regular service. 


Following a Backflow Repair

Any time a device is serviced, it should be retested. Testing confirms that replacement parts, seals, or valves are functioning as intended before the device returns to service. 


After Plumbing System Modifications

Major plumbing renovations, irrigation upgrades, fire suppression work, or other system changes may affect your backflow prevention assembly. A certified inspection helps ensure your system remains compliant and properly protected.


Signs You May Need Backflow Repair


Not every issue can wait until the next scheduled inspection. If you notice any of the following, schedule professional service as soon as possible:


• Your backflow device fails its annual inspection. 

• Water is leaking from the device. 

• Valves appear damaged or worn. 

• You notice reduced water pressure. 

• Water appears discolored or has an unusual odor or taste. 

• Your municipality notifies you that your device is not compliant. 


Prompt backflow repair helps restore protection for your water supply and prevents small issues from becoming larger plumbing problems. Certified technicians can often complete repairs and retest the device during the same visit. 


Schedule Certified Backflow Testing with D & L Plumbing


If your annual inspection is due or you suspect your backflow prevention device isn't working properly, D & L Plumbing is ready to help. Since 1987, our licensed, certified team has provided reliable backflow testing, backflow repair, installation, and maintenance throughout Columbus, OH; New Albany, OH; and Dublin, OH. 


Contact D & L Plumbing today to schedule certified backflow testing and help keep your water supply safe and compliant. 


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