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308 Chapter 9 Cross-Connection Control
9.2.10 Health Problems Due to Cross-Connection in an Office Building

A cross-connection incident that occurred in a modern seven-story office building located
in a large city in New Hampshire resulted in numerous cases of nausea, diarrhea, loss of
work time, and employee complaints as to the poor quality of the water.
On a Saturday, a large fire occurred two blocks away from a seven-story office build-
ing in a large New Hampshire city. On Sunday, the maintenance crew of the office building

Roof mounted solar panels

Heat exchanger
Utility
sink

Sink

Sink

Coffee
machine

Sink

Chemical
Water feeder
fountatin

Booster pump

Meter
Figure 9.10 Cross-
Water main
Connection in a Modern Backpressure
Seven-Story Office Building Recommended installation backflow
in New Hampshire of backflow preventers