What is Backflow?

Backflow occurs when water flows in the wrong direction and potentially contaminated water is pulled back into the clean drinking water supply. This can happen in both homes and businesses. Because this water may contain dirt, chemicals, or bacteria, backflow can create serious health risks if it is not properly prevented.

The Department of Health requires the use of backflow prevention devices and routine testing to help protect public drinking water. Each local water district is responsible for creating and enforcing its own backflow program, which is why testing requirements and deadlines can vary by location.

There are two main types of backflow:

Backsiphonage happens when water is pulled out of the system due to a vacuum. This often occurs during a sudden drop in water pressure, such as a water main break or heavy water use by fire crews. When pressure drops, contaminated water can be drawn backward into the clean water system.

Backpressure occurs when water is pushed back into the system. This is typically caused by higher pressure on the customer’s side of the water system. Elevation changes or pumps can create enough force to push water in the wrong direction and into the drinking water supply.

Backflow may not be something most people think about, but it plays a critical role in water safety. Understanding how backflow happens helps explain why prevention devices and regular testing are required. Proper testing ensures that clean water stays clean and that communities remain safe.

If your property requires annual backflow testing, A. R. Brown Backflow Testing makes the process simple. Schedule your test online in minutes with clear, upfront pricing and reliable local service. Book your appointment today and stay in compliance with confidence.