Under the pump over back-flow costs | Goulburn Post
There is usually a lot of resistance to the implementation of backflow regulations and compliance. Backflow events occur every day. Backflow can occur as routinely as the city performing maintenance on their fire hydrants, working on a distribution line, conducting pump maintenance, water main breaks, fire engines connecting to a fire hydrant, or even the flushing of a toilet at a residence. It does not take imagination to understand how a backflow event can occur with 2 water sources on the same premises.
Backflow is a concept misunderstood by most people, but once understood is not forgotten.
It is far cheaper to require a backflow device and annual testing than to flush water lines, decontaminate, pay medical bills, and law suites.
Be careful what you drink.