3 sourced cases · 1933–2026
A reference archive of documented contamination events — compiled from public reporting and official notices, each with the cross-connection control lesson behind it.
§ Chronology
From a 1933 World's Fair outbreak to modern industrial spills — every case is one boundary between safe and unsafe water giving way.
§ Latest additions
A failed backflow preventer at one home allowed contaminated water to enter the public system, prompting a four-day boil water notice. City officials isolated the property, removed the meter, and conducted extensive sampling before lifting the advisory. The incident highlighted the importance of property-owner maintenance of backflow devices.
Two hotels housing World's Fair visitors had cross connections that contaminated the drinking water supply with amoebic dysentery. Because of the disease's long incubation period, symptoms appeared only after visitors returned home. Local officials suppressed information to avoid harming fair attendance. The outbreak resulted in nearly 100 deaths and more than 1,700 confirmed cases.
§ The archive
03 / 03 cases shown
A failed backflow preventer at one home allowed contaminated water to enter the public system, prompting a four-day boil water notice. City officials isolated the property, removed the meter, and conducted extensive sampling before lifting the advisory. The incident highlighted the importance of property-owner maintenance of backflow devices.
A faulty valve at Cantina Settecani winery caused 1,000 liters of Lambrusco wine to leak into municipal water pipes. For about three hours, residents in roughly 20 homes found wine flowing from faucets and shower heads. Officials confirmed the incident posed no health risks.
Two hotels housing World's Fair visitors had cross connections that contaminated the drinking water supply with amoebic dysentery. Because of the disease's long incubation period, symptoms appeared only after visitors returned home. Local officials suppressed information to avoid harming fair attendance. The outbreak resulted in nearly 100 deaths and more than 1,700 confirmed cases.