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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Union PWS

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.

 

19

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.0857 ppb71ND - 0.600 ppb
2015ND20ND
2016ND10ND
20170.0814 ppb71ND - 0.570 ppb
20180.540 ppb110.540 ppb
20190.650 ppb110.650 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG 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

All test results

Date Lab ID Result
2014-08-20AC33768ND
2014-08-20AC33769ND
2014-08-20AC337670.600 ppb
2014-09-09AC34961ND
2014-09-09AC34962ND
2014-09-09AC34963ND
2014-10-16AC37821ND
2015-09-28AC59658ND
2015-10-28AC62087ND
2016-08-29AC81735ND
2017-08-21AD04322ND
2017-08-21AD04321ND
2017-08-21AD04317ND
2017-08-22AD04318ND
2017-08-22AD04320ND
2017-08-22AD04319ND
2017-09-29AD066340.570 ppb
2018-09-20AD330830.540 ppb
2019-09-25AD553910.650 ppb