What is backflow?

Backflow is described as the undesirable reversal of the flow of water from its intended direction in any pipeline or plumbing system. Put simply, a typical water distribution system allows water to flow from a service line to your establishment. Hydraulic conditions within the system may deviate from the normal conditions, causing the water to flow in the opposite direction. Eventually, this will lead to the local public water supply, and create potentially hazardous “cross-connection”.

Information about cross connection

What is a cross connection?

Under certain conditions, water can backflow, pulling contaminants into the drinking water supply and forcing contaminated water into the building’s piping system. This typically occurs when there’s a change in pressure in the water distribution system, such as water line breaks, water main repairs, or rapid withdrawals from a nearby fire hydrant. 

Some common cross connections are:

  • Garden hoses are the most common form of cross connection. Your hose is directly connected to the water supply system. Hoses frequently come in contact with various chemicals and fertilizers that could affect your health.
  • Boilers and HVAC systems
  • In-ground lawn sprinklers
  • Fountain soda machines\fire sprinklers
  • Pressure washers
  • Toilets
  • Pools

What is the Cross Connection Control & Backflow Prevention Program?

The purpose of a Cross-Connection Control Program is to protect the public potable water supple from the possibility of contamination or pollution by isolating, within the customer’ internal distribution system, contaminants or pollutants which could backflow or back-siphon into the public water system.

Testable Backflow Prevention Systems

In 2022, Columbia Water Company partnered with the National Water Specialties Company (NAWSC). If your property is registered as a commercial property, the NAWSC will most likely send you a letter regarding the need for a testable Dual Check Valve to be installed and tested annually. Once the testing is completed, the results must be sent directly to the NAWSC. They can be contacted at 844.605.5213 or NAWSC.net.

Helpful Links:

National Water Specialties Company Website
Cross Connection Testing Companies