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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Homer

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

 

56

Samples

0

Samples exceeding legal limit (MCL)

25

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.643 ppb144ND - 2.80 ppb
20150.500 ppb92ND - 3.10 ppb
20161.40 ppb83ND - 5.10 ppb
20171.09 ppb96ND - 2.30 ppb
20180.913 ppb85ND - 1.80 ppb
20190.913 ppb85ND - 2.00 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
2014-01-08AI26178ND
2014-01-08AI26177ND
2014-01-08AI26176ND
2014-03-04AI29159ND
2014-03-04AI29158ND
2014-04-14AI37968ND
2014-06-02AI42074ND
2014-06-02AI420731.90 ppb
2014-07-08AI45055ND
2014-09-04AI524871.50 ppb
2014-09-04AI524862.80 ppb
2014-10-16AI57749ND
2014-12-08AI608522.80 ppb
2014-12-08AI60853ND
2015-01-12AI62652ND
2015-03-04AI66365ND
2015-03-04AI66364ND
2015-06-02AI78551ND
2015-06-02AI78550ND
2015-09-03AI88767ND
2015-09-03AI887663.10 ppb
2015-12-03AJ01952ND
2015-12-03AJ019511.40 ppb
2016-03-02AJ07373ND
2016-03-02AJ07372ND
2016-06-06AJ13544ND
2016-06-06AJ135433.50 ppb
2016-09-06AJ25694ND
2016-09-06AJ256935.10 ppb
2016-12-13AJ36800ND
2016-12-13AJ367992.60 ppb
2017-02-21AJ46800ND
2017-03-06AJ47438ND
2017-03-06AJ474371.50 ppb
2017-06-05AJ56628ND
2017-06-05AJ566272.30 ppb
2017-09-05AJ668081.60 ppb
2017-09-05AJ668071.70 ppb
2017-12-04AJ745641.30 ppb
2017-12-04AJ745631.40 ppb
2018-03-05AJ851361.20 ppb
2018-03-05AJ851371.30 ppb
2018-06-04AJ90530ND
2018-06-04AJ90529ND
2018-09-05AJ999121.70 ppb
2018-09-05AJ999111.80 ppb
2018-11-26AK06628ND
2018-11-26AK066271.30 ppb
2019-03-05AK12560ND
2019-03-05AK12559ND
2019-06-03AK18606ND
2019-06-03AK186051.20 ppb
2019-09-03AK290621.60 ppb
2019-09-03AK290612.00 ppb
2019-12-03AK375031.40 ppb
2019-12-03AK375041.10 ppb