Any possibility of pollutants, contaminants, and system or plumbing hazards is considered a potential hazard. Examples may include:
- Underground sprinklers utilizing potable water
- Water softener
- Swimming pool, etc.
Putting the garden hose in a swimming pool to fill it; putting a garden hose in a pet's water bucket or fish tank can unwittingly create a cross-connection.
So you may ask …What's the big deal? The big deal is backflows due to cross-connections can cause sickness and death.