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EWG's Tap Water Database — 2021 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.

MORE ABOUT THIS CONTAMINANT

 

113

Samples

0

Samples exceeding legal limit (MCL)

82

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20143.11 ppb116ND - 11.0 ppb
20153.24 ppb2317ND - 7.90 ppb
20164.04 ppb2318ND - 11.0 ppb
20172.09 ppb106ND - 8.10 ppb
20185.02 ppb2317ND - 14.0 ppb
20194.67 ppb2318ND - 12.1 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 Result
2014-02-048.90 ppb
2014-05-057.20 ppb
2014-07-010.540 ppb
2014-07-15ND
2014-07-15ND
2014-07-150.990 ppb
2014-07-28ND
2014-08-045.60 ppb
2014-08-13ND
2014-08-25ND
2014-11-0411.0 ppb
2015-02-047.90 ppb
2015-02-043.60 ppb
2015-02-042.90 ppb
2015-02-045.40 ppb
2015-05-047.10 ppb
2015-05-046.20 ppb
2015-05-044.30 ppb
2015-05-044.00 ppb
2015-07-010.530 ppb
2015-07-15ND
2015-07-16ND
2015-07-16ND
2015-07-23ND
2015-08-036.50 ppb
2015-08-032.60 ppb
2015-08-033.30 ppb
2015-08-032.70 ppb
2015-09-14ND
2015-09-29ND
2015-11-031.60 ppb
2015-11-034.90 ppb
2015-11-035.80 ppb
2015-11-035.10 ppb
2016-02-092.90 ppb
2016-02-093.50 ppb
2016-02-093.60 ppb
2016-02-094.50 ppb
2016-05-0410.00 ppb
2016-05-044.80 ppb
2016-05-043.90 ppb
2016-05-046.90 ppb
2016-07-260.670 ppb
2016-08-089.40 ppb
2016-08-083.60 ppb
2016-08-088.10 ppb
2016-08-083.60 ppb
2016-08-10ND
2016-08-18ND
2016-08-25ND
2016-08-25ND
2016-09-130.590 ppb
2016-09-29ND
2016-11-0811.0 ppb
2016-11-085.50 ppb
2016-11-085.40 ppb
2016-11-084.90 ppb
2017-02-078.10 ppb
2017-02-074.40 ppb
2017-02-073.90 ppb
2017-02-073.20 ppb
2017-07-030.800 ppb
2017-07-31ND
2017-08-14ND
2017-08-25ND
2017-08-280.530 ppb
2017-09-18ND
2018-02-0611.0 ppb
2018-02-064.70 ppb
2018-02-063.80 ppb
2018-02-064.60 ppb
2018-05-087.90 ppb
2018-05-088.30 ppb
2018-05-084.60 ppb
2018-05-085.80 ppb
2018-07-11ND
2018-07-16ND
2018-07-25ND
2018-07-260.750 ppb
2018-07-26ND
2018-08-0614.0 ppb
2018-08-064.80 ppb
2018-08-068.30 ppb
2018-08-064.60 ppb
2018-08-28ND
2018-08-28ND
2018-11-0612.0 ppb
2018-11-065.90 ppb
2018-11-067.40 ppb
2018-11-067.00 ppb
2019-02-058.10 ppb
2019-02-055.00 ppb
2019-02-053.80 ppb
2019-02-055.70 ppb
2019-05-078.15 ppb
2019-05-075.68 ppb
2019-05-073.97 ppb
2019-05-076.47 ppb
2019-07-01ND
2019-07-01ND
2019-07-03ND
2019-07-110.680 ppb
2019-07-261.09 ppb
2019-07-31ND
2019-09-0411.9 ppb
2019-09-044.35 ppb
2019-09-047.35 ppb
2019-09-045.35 ppb
2019-09-18ND
2019-11-0512.1 ppb
2019-11-056.17 ppb
2019-11-055.55 ppb
2019-11-056.04 ppb