Cross connection problems
Yellow water in a drinking fountain and green ice being dispensed from a cafeteria ice dispenser were some of the problems observed in an Atlanta, GA bank. It was later reported that a pump, used for the bank's air conditioning system, had burned out. A maintenance man, unaware of the danger, connected the A/C system to another pump used for potable water. This resulted in large doses of bichromate of soda being introduced into the potable water supply, causing the dramatic appearance of yellow water and colored ice cubes.
In Worcester, MA, the College of the Holy Cross football team experienced a hepatitis incident, which was later determined to be caused by a backflow of contaminated water. It took close to nine months for officials to determine that a severe fire in a nearby neighborhood lowered the water pressure in the area of the football field to the point where a backpressure backflow condition developed, allowing contaminates from a sunken hose bibb pit to backflow into the field house drinking bubbler.
In San Francisco, an industrial plant had a submerged water inlet supplying a lye vat. Immediately adjacent to the installation was the employees' shower room. Officials fortunately discovered the cross connection, but were alarmed that employees could be bathing in water contaminated with lye from the vats.
Dan received a call from a local grammar school, who reported that glycol anti-freeze was coming out of the gymnasium bubbler. After investigating the water system, Dan found a reduced pressure zone device (RPZ) that had never been tested. The device failed to perform due to a stuck relief. Periodic testing is ESSENTIAL to ensuring the safety of our public water supply.