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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

Boone County PWSD 9

Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane 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

 

22

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.385 ppb21ND - 0.770 ppb
20150.146 ppb71ND - 1.02 ppb
20160.335 ppb21ND - 0.670 ppb
2017ND20ND
20180.204 ppb71ND - 1.43 ppb
20190.390 ppb21ND - 0.780 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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
2014-06-24AC287560.770 ppb
2014-06-24AC28755ND
2015-02-18AC42745ND
2015-02-18AC42741ND
2015-02-18AC42743ND
2015-02-18AC42742ND
2015-02-18AC42744ND
2015-06-29AC513161.02 ppb
2015-06-29AC51315ND
2016-06-27AC74961ND
2016-06-27AC749620.670 ppb
2017-06-29AC98563ND
2017-06-29AC98562ND
2018-06-04AD19133ND
2018-06-04AD19134ND
2018-06-04AD19135ND
2018-06-04AD19136ND
2018-06-04AD19137ND
2018-06-21AD27377ND
2018-06-21AD273781.43 ppb
2019-06-18AD49191ND
2019-06-18AD491920.780 ppb