BACKFLOW INFORMATION

WWhat Is Backflow?

Backflow is the reversal of the flow of water, which can allow fluids, chemicals, or other contaminants to enter the public drinking water system. This can cause pollution or contamination of the water supply, creating serious health risks.

There are two main types of backflow:

• Backsiphonage – Usually caused by a sudden drop in water pressure (such as during a water main break or firefighting).

• Backpressure – Occurs when pressure from a non-potable source (like a pump, elevated piping, or heated system) exceeds the pressure in the clean water supply.

What Does a Backflow Device Do?

A backflow prevention assembly acts as a physical disconnect between your water supply and any source of possible contamination. Most devices use a pair of mechanical check valves to stop water from flowing in the wrong direction, protecting the clean water system in the event of a pressure change.

Who Requires It and Why?

The Environmental Protection Agency (EPA) holds local water providers responsible for keeping public water safe. In Oregon, the Oregon Health Authority (OHA) requires water providers to follow strict backflow prevention regulations and implement cross-connection control programs.

As part of these programs, backflow assemblies must be tested annually by certified professionals.

Where Are Backflow Devices Used?

Backflow prevention is required at many types of properties, including:

• Apartments and condominiums

• Restaurants and food establishments

• Commercial and industrial buildings

• Public places and irrigation systems