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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Lafayette

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

 

108

Samples

0

Samples exceeding legal limit (MCL)

47

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.783 ppb1810ND - 2.00 ppb
20150.272 ppb184ND - 1.50 ppb
20160.256 ppb184ND - 1.30 ppb
20170.639 ppb189ND - 1.60 ppb
20181.01 ppb1813ND - 2.80 ppb
20190.594 ppb187ND - 2.40 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
2014-03-20AI364851.10 ppb
2014-03-20AI364861.30 ppb
2014-03-20AI364871.10 ppb
2014-03-20AI364881.10 ppb
2014-05-14AI40538ND
2014-05-14AI40539ND
2014-06-16AI433202.00 ppb
2014-06-16AI433211.30 ppb
2014-06-16AI433221.30 ppb
2014-06-16AI43323ND
2014-09-16AI540372.00 ppb
2014-09-16AI54038ND
2014-09-16AI540391.30 ppb
2014-09-16AI540401.60 ppb
2014-12-17AI61732ND
2014-12-17AI61733ND
2014-12-17AI61734ND
2014-12-17AI61735ND
2015-03-18AI69326ND
2015-03-18AI69327ND
2015-03-18AI69328ND
2015-03-18AI69329ND
2015-04-07AI74279ND
2015-04-07AI74280ND
2015-06-16AI79919ND
2015-06-16AI79920ND
2015-06-16AI79921ND
2015-06-16AI79922ND
2015-09-15AI898111.10 ppb
2015-09-15AI89812ND
2015-09-15AI89813ND
2015-09-15AI898141.20 ppb
2015-12-15AJ02945ND
2015-12-15AJ029461.10 ppb
2015-12-15AJ029471.50 ppb
2015-12-15AJ02948ND
2016-03-15AJ08200ND
2016-03-15AJ082011.10 ppb
2016-03-15AJ082021.10 ppb
2016-03-15AJ08203ND
2016-05-11AJ12002ND
2016-05-11AJ12003ND
2016-06-14AJ141461.10 ppb
2016-06-14AJ14147ND
2016-06-14AJ14148ND
2016-06-14AJ14149ND
2016-09-21AJ28481ND
2016-09-21AJ28482ND
2016-09-21AJ28483ND
2016-09-21AJ28484ND
2016-12-20AJ372441.30 ppb
2016-12-20AJ37245ND
2016-12-20AJ37246ND
2016-12-20AJ37247ND
2017-03-20AJ483471.20 ppb
2017-03-20AJ483481.10 ppb
2017-03-20AJ483491.10 ppb
2017-03-20AJ48350ND
2017-06-21AJ58195ND
2017-06-21AJ58196ND
2017-06-21AJ582131.60 ppb
2017-06-21AJ582141.50 ppb
2017-06-21AJ582151.10 ppb
2017-06-21AJ58216ND
2017-09-18AJ682941.50 ppb
2017-09-18AJ682951.20 ppb
2017-09-18AJ682961.20 ppb
2017-09-18AJ68297ND
2017-12-18AJ75637ND
2017-12-18AJ75638ND
2017-12-18AJ75639ND
2017-12-18AJ75640ND
2018-03-20AJ862251.70 ppb
2018-03-20AJ862261.30 ppb
2018-03-20AJ862271.10 ppb
2018-03-20AJ862281.20 ppb
2018-05-22AJ89958ND
2018-05-22AJ89959ND
2018-06-18AJ918452.80 ppb
2018-06-18AJ91846ND
2018-06-18AJ918471.20 ppb
2018-06-18AJ91848ND
2018-09-18AK01392ND
2018-09-18AK013931.000 ppb
2018-09-18AK013941.20 ppb
2018-09-18AK013952.20 ppb
2018-12-12AK080491.10 ppb
2018-12-12AK080501.000 ppb
2018-12-12AK080511.10 ppb
2018-12-12AK080521.20 ppb
2019-03-20AK13625ND
2019-03-20AK13626ND
2019-03-20AK13627ND
2019-03-20AK13628ND
2019-05-08AK16869ND
2019-05-08AK16870ND
2019-06-18AK200311.30 ppb
2019-06-18AK20032ND
2019-06-18AK20033ND
2019-06-18AK200341.20 ppb
2019-09-17AK31055ND
2019-09-17AK31056ND
2019-09-17AK31057ND
2019-09-17AK310581.50 ppb
2019-12-09AK377852.40 ppb
2019-12-09AK377861.30 ppb
2019-12-09AK377871.50 ppb
2019-12-09AK377881.50 ppb