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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

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Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

 

29

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.600 ppb21ND - 1.20 ppb
20150.171 ppb71ND - 1.20 ppb
2016ND40ND
2017ND50ND
2018ND70ND
2019ND40ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for dibromochloromethane was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date Lab ID Result
2014-03-20AI36503ND
2014-08-21AI508801.20 ppb
2015-03-10AI68777ND
2015-03-10AI68776ND
2015-03-10AI68775ND
2015-03-10AI68774ND
2015-03-10AI68773ND
2015-03-10AI68772ND
2015-07-13AI828181.20 ppb
2016-03-09AJ08001ND
2016-03-09AJ08000ND
2016-03-09AJ07999ND
2016-06-21AJ14860ND
2017-01-24AJ43416ND
2017-05-17AJ55685ND
2017-06-28AJ58904ND
2017-07-26AJ61793ND
2017-10-24AJ72298ND
2018-02-27AJ84670ND
2018-02-27AJ84669ND
2018-02-27AJ84668ND
2018-02-27AJ84667ND
2018-02-27AJ84666ND
2018-02-27AJ84665ND
2018-06-27AJ92643ND
2019-04-30AK16070ND
2019-04-30AK16069ND
2019-04-30AK16068ND
2019-06-26AK21059ND