What is backflow or cross connection?

Examples include:

  • Cross connection is any connection or possible connection between the drinking water system and any source of contamination
    • Cross connection can occur due to backpressure of backsiphonage
  • Backflow is the reversed flow of contaminated water or other liquids into the drinking water
  • Backsiphonage occurs when a partial vacuum causes the water flow to reverse and contaminates are siphoned or sucked into your drinking water
  • Backpressure occurs when contaminants under pressure greater than the pressure in your drinking water system are pushed into your drinking water

Show All Answers

1. Why do I need a backflow preventer?
2. What is backflow or cross connection?
3. What are the most common ways for cross connections to occur in a residential setting?
4. Where can I find a backflow preventer?