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Boston Molasses Disaster

The Boston Molasses Disaster, also known as the Great Molasses Flood, was a deadly industrial disaster in Boston’s North End on January 15, 1919.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 27, 2026|2 min read| Fact-checked

The Boston Molasses Disaster, also known as the Great Molasses Flood, was a deadly industrial disaster in Boston’s North End on January 15, 1919. A large storage tank ruptured and released a wave of molasses that killed 21 people and injured about 150 others.

Event

On January 15, 1919, a molasses storage tank at Commercial Street in Boston ruptured, releasing a large wave of molasses into the surrounding neighborhood. The flood damaged buildings, rail infrastructure, and streets in the North End.

Casualties and damage

The disaster killed 21 people and injured about 150 more. Sources also describe severe property damage, including destruction of buildings and impacts extending into Boston Harbor.

Investigations and later court proceedings concluded that the tank had been poorly built and maintained. In 1925, the company was found liable in a landmark negligence case involving many plaintiffs.

Historical significance

The flood became a lasting part of Boston history and is often cited in discussions of industrial regulation and public safety. It also remains notable for the unusual nature of the disaster.

Key facts

  • A large tank holding roughly 2.3 million U.S. gallons of molasses burst in Boston’s North End.
  • The released molasses flowed through streets at high speed and caused extensive destruction.
  • Twenty-one people died and about 150 were injured.
  • The disaster led to a long negligence lawsuit and a finding that the company was liable for the tank’s flawed construction.
  • The event is widely remembered as one of Boston’s best-known historical disasters.
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Canadian context

The disaster is often referenced in North American industrial-safety history and legal discussions, including by Canadian readers interested in major urban disasters and negligence law.

Frequently asked questions

What was the Boston Molasses Disaster?
It was a 1919 industrial disaster in Boston when a large molasses tank ruptured and sent a deadly wave through the North End.
How many people died in the molasses flood?
Twenty-one people were killed.
How many people were injured?
About 150 people were injured.
What caused the disaster?
The tank failed because of flawed construction and maintenance, according to later investigations and court findings.
Where did the disaster happen?
It happened in Boston’s North End, near Commercial Street and Keany Square.
Was anyone held legally responsible?
Yes. After a lengthy legal process, the company was found liable for the tank’s defective construction.

References

  1. Encyclopaedia Britannicahttps://www.britannica.com/topic/Great-Molasses-Flood
    Supports: Date, location, fatalities, and overall description of the disaster
  2. Wikipediahttps://en.wikipedia.org/wiki/Great_Molasses_Flood
    Supports: Tank size, location, estimated speed, deaths, injuries, and facility details
  3. City of Bostonhttps://www.boston.gov/news/100-years-ago-today-molasses-crashes-through-bostons-north-end
    Supports: Regulatory and historical significance
  4. Massachusetts Secretary of the Commonwealthhttps://www.sec.state.ma.us/divisions/state-house-tours/did-you-know/Molasses-Flood.htm
    Supports: Date, deaths, injuries, and court outcome
  5. HISTORYhttps://www.history.com/articles/the-great-molasses-flood-of-1919
    Supports: Tank ownership, construction context, and background
  6. HISTORYhttps://www.history.com/this-day-in-history/january-15/molasses-floods-boston-streets
    Supports: Date, deaths, and company involvement
  7. History Todayhttps://www.historytoday.com/archive/sticky-tragedy-boston-molasses-disaster
    Supports: Legal aftermath and historical significance