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EWG's Tap Water Database — 2019 UPDATE

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Bromoform

Los Angeles County Waterworks District 36-Val Verde

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

21

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND30ND
20140.598 ppb98ND - 0.930 ppb
20150.402 ppb94ND - 1.07 ppb
20160.616 ppb97ND - 1.09 ppb
20170.302 ppb52ND - 0.850 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.5 ppb

The EWG Health Guideline of 0.5 ppb for bromoform 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
2013-10-095442-800-1031ND
2013-10-095442-801-1244ND
2014-01-085442-800-12100.670 ppb
2014-01-085442-801-09440.590 ppb
2014-04-085442-800-13300.640 ppb
2014-04-105442-801-08450.580 ppb
2014-05-075442-012-0950ND
2014-07-085442-800-09300.710 ppb
2014-07-085442-801-08250.600 ppb
2014-10-065442-800-10400.930 ppb
2014-10-065442-801-09500.660 ppb
2015-01-145442-801-10121.06 ppb
2015-01-145442-800-0915ND
2015-04-095442-801-0908ND
2015-04-095442-800-0831ND
2015-05-125442-012-1040ND
2015-07-085442-801-08300.870 ppb
2015-07-085442-800-09451.07 ppb
2015-10-065442-801-08200.620 ppb
2015-10-065442-800-0930ND
2016-01-135442-801-09250.640 ppb
2016-01-135442-800-10150.770 ppb
2016-02-295442-012-1039ND
2016-04-115442-801-10300.800 ppb
2016-04-115442-800-11250.830 ppb
2016-07-125442-801-12150.810 ppb
2016-07-125442-800-1305ND
2016-10-135442-801-10501.09 ppb
2016-10-135442-800-11450.600 ppb
2017-01-105442-801-11540.660 ppb
2017-01-105442-800-12200.850 ppb
2017-07-109588-801-0950ND
2017-07-109588-800-0900ND
2017-07-199588-012-1058ND