Backflows in irrigation systems are often caused by either back siphonage or back pressure. Back siphonage occurs when a sudden drop in water pressure causes water to flow backward, potentially drawing contaminants into the clean water supply. This can happen during events like water main breaks or high-demand usage. Back pressure occurs when the pressure in your irrigation system exceeds the main water supply pressure, pushing contaminants back into the potable water. Both situations pose health risks. To address backflow, contact professionals to repair or replace malfunctioning backflow preventers and schedule annual testing to ensure they function correctly. These steps help protect your drinking water in North Carolina from contamination.


What is back siphonage, and what causes it?

Back siphonage is a common cause of backflow in irrigation systems, occurring when there is a sudden drop in water pressure and causing water to flow backward. Think of it as a vacuum effect where the water is sucked back through the pipes instead of flowing out. This issue often arises during events like fire hydrant use, water main breaks, or high demand in the water supply system, which can significantly reduce pressure.

When back siphonage happens, contaminants from the soil, pesticides, or fertilizer can enter the clean water supply, posing health risks. It’s crucial to monitor and maintain your backflow prevention device to prevent such occurrences and ensure no harmful substances are drawn into your drinking water.

Back siphonage is often caused by events like fire hydrant use, water main breaks, or high demand in the water supply system.

What is back pressure, and what causes it?

Back pressure is another common cause of backflow in irrigation systems. Back pressure occurs when the pressure in your irrigation system exceeds the pressure in the main water supply. This situation can arise if there’s an increase in downstream pressure due to pumps, elevated tanks, or heating systems.

In this scenario, water is pushed back into the potable water supply instead of flowing out as intended. This reversal can pull contaminants into the clean water, leading to potential health hazards. Like back siphonage, back pressure can be detrimental if not addressed, causing contamination that affects both the irrigation system and the broader water supply.


What should you do to address backflow in your irrigation system?

Backflow regulator of an irrigation system in Cary, NC.

If you suspect backflow in your irrigation system, it's crucial to take immediate action to protect your drinking water supply.

  • Contact professionals ASAP to repair or replace your backflow preventer. A backflow preventer is a device designed to prevent backflow from occurring. If your backflow preventer is malfunctioning or damaged, it may not effectively prevent backflow. Professional technicians can inspect your backflow preventer, identify any issues, and either repair or replace it to ensure your drinking water remains safe.
  • Schedule annual backflow testing to protect your drinking water supply. Regular testing of your backflow preventer is essential to ensure it is functioning correctly. Annual testing can identify any potential issues early, allowing for prompt repairs or replacements. By scheduling annual testing, you can have peace of mind knowing that your drinking water supply is protected from contamination.

Call us today to schedule our irrigation backflow testing service!

At Greenway Irrigation, we understand the importance of maintaining a safe and reliable water supply. That's why we offer a reliable irrigation backflow testing service to ensure your irrigation system is free from backflow issues. Our team of experienced professionals will thoroughly inspect your backflow preventer and provide you with peace of mind knowing your drinking water is safe. We also offer irrigation repairs to address any issues with the device and keep it in good working condition.

You can schedule this service independently, but we highly recommend getting it as part of our irrigation service programs to keep your entire system in top shape. This service is offered to homeowners in and around Cary, Chapel Hill, and Raleigh, NC. Call us today at (919) 217-4340 to schedule backflow testing for your irrigation system.