Dihydrogen monoxide hoax

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"Dihydrogen monoxide" redirects here. For the H2O molecule, see Properties of water.
Water consists of two hydrogen atoms and one oxygen atom.

The dihydrogen monoxide hoax involves calling water (H2O) by an unfamiliar name, "dihydrogen monoxide", followed by a listing of the real effects of this chemical, often presented as an argument that this substance should be regulated, labeled as hazardous, or banned. The hoax is intended to illustrate how the lack of scientific literacy and an exaggerated analysis can lead to misplaced fears.[1]

"Dihydrogen monoxide", shortened to "DHMO", is a name for water that is consistent with the basic rules of chemical nomenclature,[2] but is not among the names published by IUPAC[2] and is almost exclusively used as a joke or hoax.

A version of the hoax was created by Eric Lechner, Lars Norpchen and Matthew Kaufman, housemates while attending University of California, Santa Cruz in 1989,[3] revised by Craig Jackson (also a UC Santa Cruz student) in 1994,[4] and brought to widespread public attention in 1997 when Nathan Zohner, a 14-year-old student, gathered petitions to ban "DHMO" as the basis of his science project, titled "How Gullible Are We?".[5]

"Dihydrogen monoxide" may sound dangerous to those with a limited knowledge of chemistry or who hold to an ideal of a "chemical-free" life (chemophobia).[5] The only familiar common usage of the term "monoxide" is in the highly toxic gas "carbon monoxide", and the simplified term "monoxide poisoning" is commonly used to refer to poisoning by this colorless and odorless substance.[6]

The joke has been frequently extended over the years. For example, a material safety data sheet—a list of information about potentially dangerous materials used in research and industry—has been created for H2O.[7][8]

Original internet appearance[edit]

The first appearance on the internet was attributed by the Pittsburgh Post-Gazette to the so-called Coalition to Ban Dihydrogen Monoxide,[4][9] a hoax organization started by Craig Jackson following the initial newsgroup discussions. The site included the following warning:[10]

Dihydrogen monoxide:

Despite the danger, dihydrogen monoxide is often used:


The water molecule has the chemical formula H2O, meaning each molecule of water is composed of two hydrogen atoms and one oxygen atom. Literally, the term "dihydrogen monoxide" means "two hydrogen, one oxygen", consistent with its molecular formula: the prefix di- in dihydrogen means "two", the prefix mon- in monoxide means "one", and an oxide is a compound that contains one or more oxygen atoms.[11]

Public efforts involving DHMO[edit]

The logo of DHMO.org, primary current residence of the dihydrogen monoxide hoax
  • In 1989, Eric Lechner, Lars Norpchen and Matthew Kaufman circulated a Dihydrogen Monoxide contamination warning on the University of California, Santa Cruz campus via photocopied fliers.[12] The concept originated one afternoon when Kaufman recalled a similar warning about "Hydrogen Hydroxide" that had been published in his mother's hometown paper, the Durand (Michigan) Express, and the three then worked to coin a term that "sounded more dangerous". Lechner typed up the original warning flier on Kaufman's computer, and a trip to the local photocopying center followed that night.
  • In 1994, Craig Jackson created a web page for the Coalition to Ban DHMO.[10]
  • The Friends of Hydrogen Hydroxide was created by Dan Curtis Johnson partly as a foil on the Coalition page, to provide evidence of 'misguided' supporters of dihydrogen monoxide. This form of collaborative connivance is a classic tool of internet spoofers.[13]
  • In 1997, Nathan Zohner, a 14-year-old junior high student at Eagle Rock Junior High School in Idaho Falls, Idaho, gathered 43 votes to ban the chemical, out of 50 people surveyed among his classmates. Zohner received the first prize at Greater Idaho Falls Science Fair for analysis of the results of his survey.[5] In recognition of his experiment, journalist James K. Glassman coined the term "Zohnerism" to refer to "the use of a true fact to lead a scientifically and mathematically ignorant public to a false conclusion."[14]
  • In 1998, drawing inspiration from Jackson's web page and Zohner's research, Tom Way created a website at DHMO.org, including links to some legitimate sites such as the Environmental Protection Agency and National Institutes of Health.
  • On April 1, 1998 (April Fools' Day), a member of the Australian Parliament announced a campaign to ban dihydrogen monoxide internationally.[15]
  • In 2001 a staffer in New Zealand Green Party MP Sue Kedgley's office responded to a request for support for a campaign to ban dihydrogen monoxide by saying she was "absolutely supportive of the campaign to ban this toxic substance". This was criticised in a press release by the National Party,[16] one of whose MPs fell for the very same hoax six years later.[17]
  • In 2002, radio talk show host Neal Boortz mentioned on the air that the Atlanta water system had been checked and found to be contaminated with dihydrogen monoxide, and set about relating the hazards associated with that "dangerous" chemical. A local TV station even covered the 'scandal'. A spokesperson for the city's water system told the reporter that there was no more dihydrogen monoxide in the system than what was allowed under the law.[18]
  • The idea was used for a segment of an episode of the Penn & Teller show Penn & Teller: Bullshit!, in which actress Kris McGaha and a camera crew gathered signatures from people considering themselves "concerned environmentalists" to sign a petition to ban DHMO.[19]
  • In March 2004, Aliso Viejo, California, almost considered banning the use of foam containers at city-sponsored events because dihydrogen monoxide is part of their production. A paralegal had asked the city council to put it on the agenda; he later attributed it to poor research.[20] The law was pulled from the agenda before it could come to a vote, but not before the city received a raft of bad publicity.[5]
Danger sign in Louisville, Kentucky
  • In 2006, in Louisville, Kentucky, David Karem, executive director of the Waterfront Development Corporation, a public body that operates Waterfront Park, wished to deter bathers from using a large public fountain. "Counting on a lack of understanding about water's chemical makeup," he arranged for signs reading: "DANGER! – WATER CONTAINS HIGH LEVELS OF HYDROGEN – KEEP OUT" to be posted on the fountain at public expense.[21][22]
  • Several petitions on the UK Government e-petitions Web site on this subject have been correctly identified as hoaxes and rejected.[23]
  • In 2007 Jacqui Dean, New Zealand National Party MP, fell for the hoax, writing a letter to Associate Minister of Health Jim Anderton asking "Does the Expert Advisory Committee on Drugs have a view on the banning of this drug?"[17][24][25]
  • On April 1, 2010, Canadian Member of Parliament Andrew Scheer used the DHMO hoax as the basis for an April Fool's Day "media release" on his web site, in which he claimed to have tabled a bill to ban the substance from all federal government buildings.[26]
  • In February 2011, during the campaign of the Finnish parliamentary election, a voting advice application asked the candidates whether the availability of "hydric acid also known as dihydrogen monoxide" should be restricted. 49% of the candidates answered in favour of the restriction.[27]
  • In April 2013, two presenters at Gator Country 101.9, a radio station in Lee County, Florida, told listeners dihydrogen monoxide was coming out of their water taps as part of an April Fool's Day hoax and were suspended for a few days.[28] The prank resulted in several calls by consumers to the local utility company, which sent out a release stating that the water was safe.[29]

See also[edit]


  1. ^ Carder, L; Willingham, P.; Bibb, D. (2001), "Case-based, problem-based learning: Information literacy for the real world", Research Strategies 18 (3): 181–190, doi:10.1016/S0734-3310(02)00087-3 .
  2. ^ a b Leigh, G. J. et al. (1998), Principles of chemical nomenclature: a guide to IUPAC recommendations, Blackwell Science Ltd, UK, pp. 27–28, ISBN 0-86542-685-6 
  3. ^ Erich Lechner (February 23, 1990), Warning! Dangerous Contamination! (original usenet posting), Usenet rec.humor.funny archive 
  4. ^ a b Kruszelnicki, Karl S. (2006), Mysterious Killer Chemical, Australian Broadcasting Corporation .
  5. ^ a b c d Dihydrogen Monoxide from Urban Legends Reference Pages, Retrieved 2006-09-25.
  6. ^ Knight, Bernard (1998), Lawyers Guide to Forensic Medicine, Routledge, p. 280, ISBN 978-1-85941-159-9 
  7. ^ "DHMO Material Safety Data Sheet". Improbable Research. 
  8. ^ "Material Safety Sheet - DIHYDROGEN MONOXIDE". DHMO.org. 
  9. ^ Roddy., Dennis B. (1997), Internet-inspired prank lands 4 teens in hot water, Pittsburgh Post-Gazette (published April 19, 1997) 
  10. ^ a b Craig Jackson (1994), Ban Dihydrogen Monoxide!, Coalition to ban DHMO, archived from the original on 1996-10-31 . Coalition to ban DHMO officers, Coalition to ban DHMO, archived from the original on 1997-01-25 .
  11. ^ Van Bramer, S.E. (1996), Chemical Nomenclature .
  12. ^ The original poster circulated at UC Santa Cruz (PDF)
  13. ^ http://www.armory.com/~crisper/DHMO/
  14. ^ Glassman, James K (1997). "Dihydrogen Monoxide: Unrecognized Killer". The Washington Post. 
  15. ^ Campaign launched against dihydrogen monoxide, Deutsche Presse-Agentur, April 1, 1998 .
  16. ^ "Greens Support Ban On Water!". Scoop Independent News. 2001-10-25. 
  17. ^ a b Gnad, Megan (2007-09-14). "MP tries to ban water". New Zealand Herald. 
  18. ^ http://fellowshipofminds.wordpress.com/2012/06/05/neal-boortz-to-hang-up-the-headphones/
  19. ^ "Penn & Teller: Bullshit!" Environmental Hysteria (2003), Internet Movie Database 
  20. ^ Local officials nearly fall for H2O hoax, at MSNBC March 15, 2004, Retrieved 2006-09-25.
  21. ^ Water without hydrogen would warrant warning, Louisville Courier-Journal, Monday, July 17, 2006 (link inactive as of Friday, May 18, 2007)
  22. ^ Danger! H in H2O, Chemical & Engineering News, October 23, 2006 webcite mirror
  23. ^ Petition to "Ban dihydrogen monoxide" on UK Government e-petitions Web site
  24. ^ "Questions And Answers – Wednesday, September 12, 2007". Scoop. September 13, 2007. 
  25. ^ "PDF file of related correspondence" (PDF). Scoop. September 13, 2007. 
  26. ^ "REGINA-QU'APPELLE MP TABLES LEGISLATION TO BAN DIHYDROGEN MONOXIDE". 2010-04-01. Archived from the original on July 6, 2011. 
  27. ^ Pitäisikö lakia tiukentaa vetyhapon saatavuuden ja käytön osalta?, Sosiaalinen Vaalikone, February 25, 2011, archived from the original on 2013-05-29 .
  28. ^ "Florida DJs Are Off the Hook for Their Successful April Fool's Prank". The Atlantic Wire. April 3, 2013. Retrieved 2013-04-11. 
  29. ^ "2 radio personalities suspended due to April Fools' Day prank". WFTV. April 2, 2013. Retrieved 2013-04-02. 

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