Backflow can be a health hazard for your family or other consumers if contaminated water enters your water supply plumbing system and is used for drinking, cooking or bathing. Chemical burns, fires, explosions, poisonings, illness and death have all been caused by backflow through cross connections.
As a consumer, you are legally responsible for protecting
your water supply plumbing from backflow that may contaminate drinking water. This includes complying with plumbing code and not creating cross connections.