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EWG's Tap Water Database — 2019 UPDATE

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Bromodichloromethane

Montreal Waterworks

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.

 

40

Samples

0

Samples exceeding legal limit (MCL)

29

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20121.08 ppb119ND - 2.50 ppb
20130.224 ppb83ND - 0.720 ppb
20140.251 ppb74ND - 0.700 ppb
2015N/A00N/A
20161.62 ppb65ND - 3.00 ppb
20172.35 ppb881.80 ppb - 3.00 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
2012-03-146541680.430 ppb
2012-03-146541700.510 ppb
2012-03-146541690.840 ppb
2012-03-28656194ND
2012-06-076669261.60 ppb
2012-06-076669231.60 ppb
2012-06-076669252.30 ppb
2012-09-266861780.700 ppb
2012-09-266861791.40 ppb
2012-12-19699243ND
2012-12-196992442.50 ppb
2013-02-19705781ND
2013-02-19705782ND
2013-06-13725762ND
2013-06-137257630.630 ppb
2013-09-18746328ND
2013-09-187463290.440 ppb
2013-12-177637030.720 ppb
2013-12-30764708ND
2014-03-18775407ND
2014-03-187754080.700 ppb
2014-06-037940310.220 ppb
2014-06-037940300.260 ppb
2014-06-037940270.580 ppb
2014-08-27813789ND
2014-08-27813788ND
2016-05-03919154ND
2016-05-039191550.340 ppb
2016-07-289361231.60 ppb
2016-07-289361242.00 ppb
2016-10-269558913.00 ppb
2016-10-269558902.80 ppb
2017-01-309715511.80 ppb
2017-01-309715502.10 ppb
2017-05-049868332.10 ppb
2017-05-049868342.20 ppb
2017-07-3110076722.70 ppb
2017-07-3110076733.00 ppb
2017-10-2510263782.40 ppb
2017-10-2510263772.50 ppb