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Here is a small sample of some of the more recent Backflow incidents in Indiana:

1952

Extensive corrosion of a copper cylinder in a manufacturing plant was caused by faulty check valve on a carbonated beverage machine. Twelve persons ill.

1981

1990

Six staff members of a middle school reported becoming ill after drinking water containing ethylene glycol that backflowed from the school's cooling system into the potable water system.

1994

Water main break caused a drop in water pressure allowing anti-freeze from an air conditioning unit to backsiphone into the potable water supply.