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Dibromochloromethane

Boone County PWSD 9

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.

 

21

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20101.14 ppb440.970 ppb - 1.23 ppb
20110.325 ppb21ND - 0.650 ppb
20120.600 ppb52ND - 1.54 ppb
2013ND10ND
20140.630 ppb21ND - 1.26 ppb
20150.357 ppb71ND - 2.50 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
2010-02-24AB129511.14 ppb
2010-05-17AB189950.970 ppb
2010-08-11AB306591.23 ppb
2010-11-29AB369311.22 ppb
2011-02-22AB40652ND
2011-06-28AB489630.650 ppb
2012-02-07AB66759ND
2012-02-07AB667611.54 ppb
2012-02-08AB66758ND
2012-02-08AB66760ND
2012-06-26AB751681.46 ppb
2013-06-13AC01320ND
2014-06-24AC28755ND
2014-06-24AC287561.26 ppb
2015-02-18AC42743ND
2015-02-18AC42742ND
2015-02-18AC42744ND
2015-02-18AC42745ND
2015-02-18AC42741ND
2015-06-29AC513162.50 ppb
2015-06-29AC51315ND