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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Better Waterworks Water System

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

 

92

Samples

0

Samples exceeding legal limit (MCL)

76

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.404 ppb164ND - 1.67 ppb
20151.70 ppb1612ND - 3.83 ppb
20161.72 ppb12120.580 ppb - 2.49 ppb
201783.1 ppb16160.840 ppb - 182.0 ppb
2018137.1 ppb1616109.0 ppb - 164.0 ppb
20197.23 ppb16161.40 ppb - 13.6 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
2014-02-181279207ND
2014-02-181279206ND
2014-02-181279207ND
2014-02-181279206ND
2014-05-131300705ND
2014-05-131300706ND
2014-05-131300706ND
2014-05-131300705ND
2014-08-121325217ND
2014-08-121325218ND
2014-08-121325218ND
2014-08-121325217ND
2014-11-2113524571.56 ppb
2014-11-2113524581.67 ppb
2014-11-2113524581.67 ppb
2014-11-2113524571.56 ppb
2015-02-1613731901.08 ppb
2015-02-1613731911.27 ppb
2015-02-1613731911.27 ppb
2015-02-1613731901.08 ppb
2015-05-051392988ND
2015-05-051392989ND
2015-05-051392989ND
2015-05-051392988ND
2015-08-2614222423.56 ppb
2015-08-2614222423.56 ppb
2015-08-2614222413.83 ppb
2015-08-2614222413.83 ppb
2015-11-0314412321.89 ppb
2015-11-0314412331.96 ppb
2015-11-0314412321.89 ppb
2015-11-0314412331.96 ppb
2016-02-1714682982.09 ppb
2016-02-1714682992.04 ppb
2016-02-1714682982.09 ppb
2016-02-1714682992.04 ppb
2016-08-1815183520.680 ppb
2016-08-1815183520.680 ppb
2016-08-1815183510.580 ppb
2016-08-1815183510.580 ppb
2016-11-1615422132.41 ppb
2016-11-1615422132.41 ppb
2016-11-1615422122.49 ppb
2016-11-1615422122.49 ppb
2017-02-01352925820080.840 ppb
2017-02-01352925820071.40 ppb
2017-02-01352925820080.840 ppb
2017-02-01352925820071.40 ppb
2017-05-053531061801136.4 ppb
2017-05-053531061801244.0 ppb
2017-05-053531061801244.0 ppb
2017-05-053531061801136.4 ppb
2017-08-0235328002006182.0 ppb
2017-08-0235328002006182.0 ppb
2017-08-0735329630001126.0 ppb
2017-08-0735329630001126.0 ppb
2017-11-0235346165002123.0 ppb
2017-11-0235346165001151.0 ppb
2017-11-0235346165001151.0 ppb
2017-11-0235346165002123.0 ppb
2018-02-0235372111001157.0 ppb
2018-02-0235372111002164.0 ppb
2018-02-0235372111001157.0 ppb
2018-02-0235372111002164.0 ppb
2018-05-0335390246001138.0 ppb
2018-05-0335390246002120.0 ppb
2018-05-0335390246001138.0 ppb
2018-05-0335390246002120.0 ppb
2018-08-0235408588002151.0 ppb
2018-08-0235408588001145.0 ppb
2018-08-0235408588001145.0 ppb
2018-08-0235408588002151.0 ppb
2018-11-0935430201001109.0 ppb
2018-11-0935430201002113.0 ppb
2018-11-0935430201001109.0 ppb
2018-11-0935430201002113.0 ppb
2019-02-01354457430021.40 ppb
2019-02-01354457430011.90 ppb
2019-02-01354457430011.90 ppb
2019-02-01354457430021.40 ppb
2019-05-01354658580028.90 ppb
2019-05-01354658580028.90 ppb
2019-05-01354658580014.70 ppb
2019-05-01354658580014.70 ppb
2019-08-013548724600213.6 ppb
2019-08-01354872460018.90 ppb
2019-08-01354872460018.90 ppb
2019-08-013548724600213.6 ppb
2019-11-14355125670018.90 ppb
2019-11-14355125670029.50 ppb
2019-11-14355125670018.90 ppb
2019-11-14355125670029.50 ppb