Peril in the pipes
Backflow problems have had
serious consequences in the
United States. Some examples:
1933 • More than 1,700 people get sick and 98 die after faulty plumbing
allows sewage to back up into a Chicago hotel’s water supply
during the city’s World’s Fair.
1969 • Ninety of 97 members of the Holy Cross football team in Massachusetts contract Hepatitis A when the team drinks water from a contaminated drinking fountain on its practice field. A fire down the street had caused the pressure to drop, which allowed water in the field’s irrigation system to move into the drinking water.
1982 • Maintenance crews in Bancroft, Mich., shut down a water main to replace a valve, causing a backflow of a chemical pesticide into the water supply. The village loses all water for two days.
1984 • Backflow of water from a nursing home’s boiler in Washington burns a worker’s hands.
1985 • A valve separating pasteurized and nonpasteurized milk fails, causing a cross-contamination at a dairy in Melrose Park, Ill. Two people die and another 160,000 people suffer salmonella poisoning across the Midwest.
1989 • Low pressure in a hose that workers in Connecticut are using to clean out a tank, causes propane to flow back into the city’s main pipes. The backflow starts fires in two homes and forces thousands of people to evacuate.
1989 • Propane from a tank in Fordyce, Ark., backs into the city water supply. Three people in separate buildings are injured from explosions after flushing toilets.
1993 • It takes two months to identify that propylene glycol from a fire sprinkler system had entered the water in an Arizona water park. In the meantime, several employees report nausea and intestinal upsets.
1995 • Pesticides back up into a water distribution system when a Louisiana farmer accidentally cuts a water main while diluting herbicides. Victims file a class-action lawsuit after they suffer nausea, stomach burns, profuse sweating, diarrhea and shortness of breath.
Sources: Environmental Protection Agency and Illinois Department of Public Health