Backflow testing refers to the inspection of backflow prevention devices to ensure the safety and cleanliness of your water supply. Backflow is when used and dirty water reverses its flow and enters into your property’s clean water pipes. It usually occurs at cross-connection between clean and dirty water lines. What mainly causes a backflow is when the water system’s pressure is higher than the pressure in the water tank. The cause of the change in pressure can be due to frozen or burst pipes. To prevent backflow from occurring, it is essential to install backflow prevention assemblies.

Importance Of Backflow Testing

The reasons why you should get backflow annual testing done include;

Complies with regulations

Many cities and states have regulations that require backflow annual testing and for properties to install backflow prevention devices. Failure to comply can result in hefty fines, and your public water supply may also be disconnected.


One of the main reasons residential backflow testing is important is due to the health risks a backflow issue poses. When contaminated water reverses and enters your clean water lines, it will pollute the water, making it unsafe for consumption. Backflows cause harmful toxins and substances like chemicals, human waste, and pesticides to enter your drinking water supply. Conducting backflow testing annually will ensure that your backflow preventer devices are working properly and there’s no reversal of water. This ensures you have a clean water supply.

Prevents costly repairs

Backflow can damage your plumbing system, leading to costly replacements and repairs. When water travels backward due to an increase in pressure, it can stress your plumbing and cause water leaks and burst pipes in your property. This can cause extensive water damage to your property and even structural damage. Annual backflow tests can help detect and prevent any damage, ensuring that your plumbing system lasts long.


Backflow Testing Procedure

Annual backflow testing is conducted for two main purposes: to know if you have a backflow problem and to identify what is causing it. If the backflow testing is done wrongly, this can lead to costly damage to your water system and health. That is why it is important to hire professionals like STL Plumbing Experts to conduct the testing procedure.

Here are the steps our team at STL Plumbing Experts follows in our backflow testing procedure: 

  • Backflow Inspection: During our backflow testing process, we will first inspect your preventive device for any signs of bad installation, damage, or wear.
  • Isolation: We will then isolate your backflow device from the rest of your water system. This is done by closing valves and draining water from the preventive device.
  • Testing procedure: We will use advanced test kits or attach special gauges to your backflow device. Our team of backflow repair experts will open and close valves to simulate backflow conditions while measuring the flow of water and pressure. This is to ensure the backflow preventers are functioning properly.
  • Maintenance and results: After testing, we will share the backflow test reports with the appropriate authorities as required by local regulations. If any issues are detected during the test, we will repair or replace your backflow assembly to ensure the safety of your water supply. 

Get Comprehensive Backflow Testing In St. Louis, Missouri

To maintain a safe and healthy water supply, it is essential that you conduct regular maintenance of your backflow preventers. At STL Plumbing Experts, we prioritize customer satisfaction and safety. We follow the standard backflow testing procedure and use state-of-the-art equipment to provide accurate and reliable backflow testing services. Contact us to learn more about our affordable backflow testing services in St Louis and St. Charles, Missouri. You can also call us at 636-223-5068 or send us an email at