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Dibromochloromethane

Washington

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.

 

23

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20100.890 ppb110.890 ppb
20111.000 ppb221.000 ppb
20120.730 ppb110.730 ppb
20130.847 ppb54ND - 1.26 ppb
20141.03 ppb129ND - 1.92 ppb
20151.43 ppb221.38 ppb - 1.48 ppb

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 0.1 ppb

The 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.

EPA Maximum Contaminant
Level Goal (MCLG)60.0 ppb

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppb = parts per billion.

All test results

Date Lab ID Result
2010-07-0610071356-10.890 ppb
2011-06-301063089-011.000 ppb
2011-08-181082048-011.000 ppb
2012-08-242083441-010.730 ppb
2013-06-243063321-010.731 ppb
2013-11-133111794-041.17 ppb
2013-11-133111794-03ND
2013-11-133111794-011.26 ppb
2013-11-133111794-021.07 ppb
2014-02-134021645-021.23 ppb
2014-02-134021645-041.83 ppb
2014-02-134021645-03ND
2014-02-134021645-011.87 ppb
2014-05-134051765-03ND
2014-05-134051765-041.29 ppb
2014-05-134051765-021.18 ppb
2014-05-134051765-011.17 ppb
2014-08-134082532-020.941 ppb
2014-08-134082532-03ND
2014-08-134082532-010.979 ppb
2014-08-134082532-041.92 ppb
2015-11-235113501-011.38 ppb
2015-11-235113501-021.48 ppb