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EWG's Tap Water Database — 2019 UPDATE

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Bromodichloromethane

Concord Water Department

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.

 

59

Samples

0

Samples exceeding legal limit (MCL)

35

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.840 ppb51ND - 4.20 ppb
2013ND40ND
2014ND40ND
20150.980 ppb51ND - 4.90 ppb
20163.85 ppb2117ND - 5.90 ppb
20173.84 ppb2016ND - 5.70 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
2012-08-16113258.014.20 ppb
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
2015-08-07146612.014.90 ppb
2015-10-15149110.04ND
2015-10-15149110.03ND
2015-10-15149110.02ND
2015-10-15149110.01ND
2016-02-05B6005770014.00 ppb
2016-02-05B6005770024.00 ppb
2016-02-05B6005770034.00 ppb
2016-02-05B6005770043.90 ppb
2016-05-04B6024830044.10 ppb
2016-05-04B6024830034.20 ppb
2016-05-04B6024830024.10 ppb
2016-05-04B6024830014.10 ppb
2016-08-05B6070110045.60 ppb
2016-08-05B6070110035.90 ppb
2016-08-05B6070110025.40 ppb
2016-08-05B6070110015.30 ppb
2016-08-05159131.015.40 ppb
2016-10-07161374.02ND
2016-10-07161374.03ND
2016-10-07161374.04ND
2016-10-07161374.05ND
2016-11-04B6100740045.30 ppb
2016-11-04B6100740035.30 ppb
2016-11-04B6100740025.20 ppb
2016-11-04B6100740015.00 ppb
2017-02-03B7005430014.50 ppb
2017-02-03B7005430024.80 ppb
2017-02-03B7005430035.10 ppb
2017-02-03B7005430044.70 ppb
2017-05-05B7022630044.30 ppb
2017-05-05B7022630034.20 ppb
2017-05-05B7022630024.50 ppb
2017-05-05B7022630014.60 ppb
2017-08-04B7066130015.20 ppb
2017-08-04B7066130025.70 ppb
2017-08-04B7066130035.40 ppb
2017-08-04B7066130045.30 ppb
2017-11-02B7096470044.70 ppb
2017-11-02B7096470034.90 ppb
2017-11-02B7096470024.70 ppb
2017-11-02B7096470014.20 ppb
2017-11-13175839.02ND
2017-11-13175839.03ND
2017-11-13175839.04ND
2017-11-13175839.05ND