What is a Cross Connection?
A cross connection is any link between a potable water system and a non-potable source that could allow contaminants to enter the water you drink. These connections are common in both residential and commercial properties.
Understanding Backflow
Backflow occurs when water pressure conditions cause the flow to reverse, pulling non-potable substances into your indoor plumbing. This typically happens through two mechanics:
- Backpressure: Occurs when pressure in your home exceeds the incoming pressure from the public main.
- Backsiphonage: Occurs when the public main pressure drops significantly due to a break or high-volume usage (such as firefighting).
Common Risks & Prevention
Garden hoses and irrigation systems are the most common sources of contamination. Hoses submerged in pools, buckets, or used with chemical sprayers can introduce pesticides, fertilizers, or soapy water into your supply.
How to Protect Your Home
Install hose bib vacuum breakers on all outside faucets. These inexpensive devices ensure water only flows in one direction.
Commercial Requirements
SCWA mandates that all commercial facilities install approved, testable backflow prevention devices. This ensures that potential hazards from industrial or geothermal systems do not enter the public water supply.