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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

Westside Rural Water Supply Corporation

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

 

27

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
20141.40 ppb111.40 ppb
2015ND40ND
20160.248 ppb51ND - 1.24 ppb
20170.314 ppb71ND - 2.20 ppb
20180.216 ppb51ND - 1.08 ppb
20190.234 ppb51ND - 1.17 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
2014-05-06Q14146520041.40 ppb
2015-07-14Q1526983024ND
2015-07-14Q1526983005ND
2015-07-14Q1526983003ND
2015-07-14Q1526983001ND
2016-09-22Q16395890011.24 ppb
2016-11-07Q1647711006ND
2016-11-07Q1647711012ND
2016-11-07Q1647711017ND
2016-11-07Q1647711009ND
2017-01-17Q1701920022ND
2017-01-17Q1701920010ND
2017-01-17Q1701920012ND
2017-01-17Q1701920009ND
2017-04-19Q1716217002ND
2017-08-08Q1733371008ND
2017-08-08Q17333710012.20 ppb
2018-09-12Q1836540001ND
2018-10-30Q1843596007ND
2018-10-30Q1843596006ND
2018-10-30Q18435960031.08 ppb
2018-10-30Q1843596002ND
2019-05-07Q1920849002ND
2019-05-07Q1920849017ND
2019-05-07Q1920849008ND
2019-05-07Q1920849006ND
2019-05-07Q19208490041.17 ppb