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EWG's Tap Water Database — 2019 UPDATE

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Dibromochloromethane

Flora

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.

 

43

Samples

0

Samples exceeding legal limit (MCL)

40

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20121.41 ppb43ND - 2.60 ppb
20130.936 ppb770.580 ppb - 1.17 ppb
20141.64 ppb880.714 ppb - 2.88 ppb
20152.23 ppb880.699 ppb - 5.06 ppb
20160.777 ppb86ND - 1.36 ppb
20170.985 ppb880.699 ppb - 1.19 ppb

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
2012-02-062020757-01ND
2012-04-302050045-012.30 ppb
2012-08-152082300-012.60 ppb
2012-11-142112138-010.750 ppb
2013-02-123021567-010.580 ppb
2013-04-093041562-010.990 ppb
2013-07-093071346-010.949 ppb
2013-10-083101451-010.858 ppb
2013-10-083101451-020.897 ppb
2013-11-063111002-011.17 ppb
2013-11-063111002-021.11 ppb
2014-02-064020755-011.30 ppb
2014-02-064020755-021.34 ppb
2014-05-074051189-010.714 ppb
2014-05-074051189-020.720 ppb
2014-08-054080859-011.66 ppb
2014-08-054080859-021.64 ppb
2014-11-054110917-012.88 ppb
2014-11-054110917-022.85 ppb
2015-02-105021590-015.00 ppb
2015-02-105021590-025.06 ppb
2015-05-065051034-010.699 ppb
2015-05-065051034-022.86 ppb
2015-08-045080582-011.22 ppb
2015-08-045080582-021.07 ppb
2015-11-095111508-020.951 ppb
2015-11-095111508-010.978 ppb
2016-02-096021605-01ND
2016-02-096021605-02ND
2016-05-036050554-010.824 ppb
2016-05-036050554-021.01 ppb
2016-08-026080413-011.15 ppb
2016-08-026080413-021.36 ppb
2016-11-026110647-010.934 ppb
2016-11-026110647-020.940 ppb
2017-02-067020894-010.699 ppb
2017-02-067020894-020.738 ppb
2017-05-017050255-011.12 ppb
2017-05-017050255-021.08 ppb
2017-08-017080445-021.19 ppb
2017-08-017080445-011.17 ppb
2017-11-077111525-020.924 ppb
2017-11-077111525-010.955 ppb