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Dibromochloromethane

Freedom District

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.

 

36

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20100.864 ppb117ND - 2.10 ppb
20110.629 ppb75ND - 1.50 ppb
20120.850 ppb85ND - 2.30 ppb
20130.740 ppb54ND - 1.40 ppb
20141.35 ppb220.900 ppb - 1.80 ppb
20150.980 ppb330.720 ppb - 1.12 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
2010-01-040060002_01_82526301.000 ppb
2010-01-130060002_01_8267530ND
2010-01-130060002_04_8267530ND
2010-02-230060002_01_00349000.800 ppb
2010-04-050060002_01_83830801.20 ppb
2010-04-260060002_01_84181602.10 ppb
2010-07-120060002_01_85439301.80 ppb
2010-10-060060002_01_8692720ND
2010-10-060060002_01_87297101.60 ppb
2010-11-030060002_01_00216401.000 ppb
2010-12-080060002_04_0027540ND
2011-01-100060002_01_88439500.600 ppb
2011-01-100060002_01_8844050ND
2011-03-160060002_01_00411700.800 ppb
2011-03-160060002_02_0041190ND
2011-03-160060002_04_00411900.900 ppb
2011-08-010060002_01_91891001.50 ppb
2011-10-170060002_01_99324530.600 ppb
2012-01-030060002_01_94511600.900 ppb
2012-05-200060002_01_6870100ND
2012-07-120060002_01_97745402.30 ppb
2012-10-010060002_01_99131401.20 ppb
2012-10-090060002_01_18720061.20 ppb
2012-11-190060002_01_99914901.20 ppb
2012-11-190060002_01_9991500ND
2012-11-190060002_02_9991500ND
2013-01-030060002_01_00581700.600 ppb
2013-02-250060002_01_04760010.800 ppb
2013-04-040060002_01_02021000.900 ppb
2013-10-140060002_01_10532061.40 ppb
2013-10-240060002_01_1055209ND
2014-01-200060002_01_10681620.900 ppb
2014-08-060060002_01_00550001.80 ppb
2015-04-2720673730011.10 ppb
2015-06-11E150039160061.12 ppb
2015-12-21211486900110.720 ppb