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EWG's Tap Water Database — 2019 UPDATE

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Bromodichloromethane

Los Angeles County Waterworks District 36-Val Verde

Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane 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)

25

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
20130.217 ppb31ND - 0.650 ppb
20140.759 ppb97ND - 1.13 ppb
20150.823 ppb97ND - 1.38 ppb
20160.860 ppb96ND - 1.66 ppb
20171.28 ppb54ND - 1.84 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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
2013-10-095442-800-10310.650 ppb
2013-10-095442-801-1244ND
2014-01-085442-800-12100.840 ppb
2014-01-085442-801-09440.740 ppb
2014-04-085442-800-13300.900 ppb
2014-04-105442-801-08450.990 ppb
2014-05-075442-012-0950ND
2014-07-085442-800-09301.10 ppb
2014-07-085442-801-08251.13 ppb
2014-10-065442-800-10401.13 ppb
2014-10-065442-801-0950ND
2015-01-145442-801-10121.11 ppb
2015-01-145442-800-0915ND
2015-04-095442-801-09080.730 ppb
2015-04-095442-800-08311.38 ppb
2015-05-125442-012-1040ND
2015-07-085442-801-08301.18 ppb
2015-07-085442-800-09451.07 ppb
2015-10-065442-801-08201.23 ppb
2015-10-065442-800-09300.710 ppb
2016-01-135442-801-09250.920 ppb
2016-01-135442-800-10151.12 ppb
2016-02-295442-012-1039ND
2016-04-115442-801-10301.42 ppb
2016-04-115442-800-11251.40 ppb
2016-07-125442-801-12151.66 ppb
2016-07-125442-800-1305ND
2016-10-135442-801-10501.22 ppb
2016-10-135442-800-1145ND
2017-01-105442-801-11541.66 ppb
2017-01-105442-800-12201.84 ppb
2017-07-109588-801-09501.50 ppb
2017-07-109588-800-09001.40 ppb
2017-07-199588-012-1058ND