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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Golden State Water Company (GSWC) - South San Gabriel

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

 

107

Samples

0

Samples exceeding legal limit (MCL)

43

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.363 ppb164ND - 1.80 ppb
20150.800 ppb167ND - 2.80 ppb
20160.315 ppb276ND - 1.90 ppb
20170.581 ppb167ND - 1.90 ppb
20183.61 ppb1612ND - 10.00 ppb
20190.794 ppb167ND - 2.70 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
2014-01-239588-800-0920ND
2014-01-239588-801-0940ND
2014-01-239588-802-0910ND
2014-01-239588-803-0930ND
2014-04-229588-800-0925ND
2014-04-229588-801-0935ND
2014-04-229588-802-0900ND
2014-04-229588-803-09101.80 ppb
2014-07-239588-800-1215ND
2014-07-239588-801-1145ND
2014-07-239588-802-1200ND
2014-07-239588-803-12251.20 ppb
2014-10-239588-800-09401.70 ppb
2014-10-239588-801-0920ND
2014-10-239588-802-0950ND
2014-10-239588-803-09301.10 ppb
2015-01-239588-800-0900ND
2015-01-239588-801-0915ND
2015-01-239588-802-0840ND
2015-01-239588-803-0850ND
2015-04-229588-800-08551.30 ppb
2015-04-229588-801-0915ND
2015-04-229588-802-0905ND
2015-04-229588-803-08451.20 ppb
2015-07-239588-800-09002.80 ppb
2015-07-239588-801-09201.10 ppb
2015-07-239588-802-0910ND
2015-07-239588-803-08502.60 ppb
2015-10-269588-800-09052.30 ppb
2015-10-269588-801-0915ND
2015-10-269588-802-0845ND
2015-10-269588-803-08551.50 ppb
2016-01-269588-800-09201.10 ppb
2016-01-269588-801-0930ND
2016-01-269588-802-0900ND
2016-01-269588-803-09101.10 ppb
2016-02-102706-046-1234ND
2016-03-092706-046-1040ND
2016-04-112706-046-1413ND
2016-04-229588-800-09001.60 ppb
2016-04-229588-801-0920ND
2016-04-229588-802-0910ND
2016-04-229588-803-08501.40 ppb
2016-05-122706-046-1239ND
2016-06-202706-046-1345ND
2016-07-112706-046-1047ND
2016-07-269588-800-0855ND
2016-07-269588-801-0925ND
2016-07-269588-802-0910ND
2016-07-269588-803-0845ND
2016-08-080007-046-1427ND
2016-09-122706-046-1426ND
2016-10-102706-046-1217ND
2016-10-269588-800-09251.90 ppb
2016-10-269588-801-0945ND
2016-10-269588-802-0935ND
2016-10-269588-803-09151.40 ppb
2016-11-072706-046-1228ND
2016-12-152706-046-1108ND
2017-01-249588-800-0915ND
2017-01-249588-801-0935ND
2017-01-249588-802-0925ND
2017-01-249588-803-09051.10 ppb
2017-04-249588-800-10301.10 ppb
2017-04-249588-801-1005ND
2017-04-249588-802-1015ND
2017-04-249588-803-10401.30 ppb
2017-07-279588-800-10151.20 ppb
2017-07-279588-801-0945ND
2017-07-279588-802-1000ND
2017-07-279588-803-10251.70 ppb
2017-10-249588-800-09001.000 ppb
2017-10-249588-801-0925ND
2017-10-249588-802-0910ND
2017-10-249588-803-08501.90 ppb
2018-01-249588-800-09203.20 ppb
2018-01-249588-801-0940ND
2018-01-249588-802-0930ND
2018-01-249588-803-09101.80 ppb
2018-04-249588-800-09001.50 ppb
2018-04-249588-801-09201.000 ppb
2018-04-249588-802-0910ND
2018-04-249588-803-08502.00 ppb
2018-07-249588-800-08409.60 ppb
2018-07-249588-801-09009.40 ppb
2018-07-249588-802-08503.60 ppb
2018-07-249588-803-083010.00 ppb
2018-10-239588-800-08505.90 ppb
2018-10-239588-801-09102.10 ppb
2018-10-239588-802-0900ND
2018-10-239588-803-08457.60 ppb
2019-01-249588-800-09551.50 ppb
2019-01-249588-801-1005ND
2019-01-249588-802-0930ND
2019-01-249588-803-09451.90 ppb
2019-04-239588-800-08551.40 ppb
2019-04-239588-801-0915ND
2019-04-239588-802-0905ND
2019-04-239588-803-08451.60 ppb
2019-07-239588-800-0845ND
2019-07-239588-801-0855ND
2019-07-239588-802-0820ND
2019-07-239588-803-08352.10 ppb
2019-10-239588-800-08552.70 ppb
2019-10-239588-801-0925ND
2019-10-239588-802-0910ND
2019-10-239588-803-08451.50 ppb