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EWG's Tap Water Database — 2019 UPDATE

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Dibromochloromethane

Los Angeles County Waterworks District 36-Val Verde

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.

 

36

Samples

0

Samples exceeding legal limit (MCL)

28

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
20130.520 ppb32ND - 0.980 ppb
20141.23 ppb98ND - 1.67 ppb
20151.27 ppb98ND - 1.81 ppb
20161.23 ppb97ND - 1.93 ppb
20171.10 ppb53ND - 2.19 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
2012-05-095442-012-0937ND
2013-05-025442-012-0918ND
2013-10-095442-800-10310.980 ppb
2013-10-095442-801-12440.580 ppb
2014-01-085442-800-12101.27 ppb
2014-01-085442-801-09441.10 ppb
2014-04-085442-800-13301.36 ppb
2014-04-105442-801-08451.39 ppb
2014-05-075442-012-0950ND
2014-07-085442-800-09301.55 ppb
2014-07-085442-801-08251.39 ppb
2014-10-065442-800-10401.67 ppb
2014-10-065442-801-09501.34 ppb
2015-01-145442-801-10121.81 ppb
2015-01-145442-800-09151.50 ppb
2015-04-095442-801-09080.930 ppb
2015-04-095442-800-08311.70 ppb
2015-05-125442-012-1040ND
2015-07-085442-801-08301.51 ppb
2015-07-085442-800-09451.58 ppb
2015-10-065442-801-08201.56 ppb
2015-10-065442-800-09300.880 ppb
2016-01-135442-801-09251.33 ppb
2016-01-135442-800-10151.62 ppb
2016-02-295442-012-1039ND
2016-04-115442-801-10301.76 ppb
2016-04-115442-800-11251.86 ppb
2016-07-125442-801-12151.93 ppb
2016-07-125442-800-1305ND
2016-10-135442-801-10501.83 ppb
2016-10-135442-800-11450.720 ppb
2017-01-105442-801-11541.73 ppb
2017-01-105442-800-12202.19 ppb
2017-07-109588-801-0950ND
2017-07-109588-800-09001.60 ppb
2017-07-199588-012-1058ND