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EWG's Tap Water Database — 2019 UPDATE

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Dibromochloromethane

Concord Water Department

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.

 

59

Samples

0

Samples exceeding legal limit (MCL)

34

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND50ND
2013ND40ND
2014ND40ND
20150.140 ppb51ND - 0.700 ppb
20160.514 ppb2117ND - 0.800 ppb
20170.455 ppb2016ND - 0.600 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
2012-08-16113258.01ND
2012-10-23115341.01ND
2012-10-23115341.02ND
2012-10-23115341.03ND
2012-10-23115341.04ND
2013-10-23125755.04ND
2013-10-23125755.03ND
2013-10-23125755.02ND
2013-10-23125755.01ND
2014-10-31137495.01ND
2014-10-31137495.02ND
2014-10-31137495.03ND
2014-10-31137495.04ND
2015-08-07146612.010.700 ppb
2015-10-15149110.04ND
2015-10-15149110.03ND
2015-10-15149110.02ND
2015-10-15149110.01ND
2016-02-05B6005770010.500 ppb
2016-02-05B6005770020.500 ppb
2016-02-05B6005770030.500 ppb
2016-02-05B6005770040.500 ppb
2016-05-04B6024830040.600 ppb
2016-05-04B6024830030.600 ppb
2016-05-04B6024830020.500 ppb
2016-05-04B6024830010.500 ppb
2016-08-05B6070110040.700 ppb
2016-08-05B6070110030.700 ppb
2016-08-05B6070110020.700 ppb
2016-08-05B6070110010.700 ppb
2016-08-05159131.010.800 ppb
2016-10-07161374.02ND
2016-10-07161374.03ND
2016-10-07161374.04ND
2016-10-07161374.05ND
2016-11-04B6100740040.700 ppb
2016-11-04B6100740030.800 ppb
2016-11-04B6100740020.800 ppb
2016-11-04B6100740010.700 ppb
2017-02-03B7005430010.500 ppb
2017-02-03B7005430020.600 ppb
2017-02-03B7005430030.600 ppb
2017-02-03B7005430040.500 ppb
2017-05-05B7022630040.600 ppb
2017-05-05B7022630030.600 ppb
2017-05-05B7022630020.600 ppb
2017-05-05B7022630010.600 ppb
2017-08-04B7066130010.600 ppb
2017-08-04B7066130020.600 ppb
2017-08-04B7066130030.600 ppb
2017-08-04B7066130040.600 ppb
2017-11-02B7096470040.500 ppb
2017-11-02B7096470030.600 ppb
2017-11-02B7096470020.500 ppb
2017-11-02B7096470010.500 ppb
2017-11-13175839.02ND
2017-11-13175839.03ND
2017-11-13175839.04ND
2017-11-13175839.05ND