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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Montreal Waterworks

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.

MORE ABOUT THIS CONTAMINANT

 

36

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND60ND
2015N/A00N/A
2016ND60ND
2017ND80ND
2018ND80ND
2019ND80ND

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
2014-03-18775407ND
2014-03-18775408ND
2014-06-03794030ND
2014-06-03794027ND
2014-08-27813789ND
2014-08-27813788ND
2016-05-03919155ND
2016-05-03919154ND
2016-07-28936124ND
2016-07-28936123ND
2016-10-26955890ND
2016-10-26955891ND
2017-01-30971550ND
2017-01-30971551ND
2017-05-04986833ND
2017-05-04986834ND
2017-07-311007673ND
2017-07-311007672ND
2017-10-251026377ND
2017-10-251026378ND
2018-01-301039100ND
2018-01-301039101ND
2018-05-021053432ND
2018-05-021053433ND
2018-07-301070317ND
2018-07-301070318ND
2018-10-291089801ND
2018-10-291089802ND
2019-02-041103570ND
2019-02-041103569ND
2019-05-011118691ND
2019-05-011118692ND
2019-07-301137525ND
2019-07-301137524ND
2019-10-291157980ND
2019-10-291157979ND