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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Canton Water Department (MWRA)

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

 

109

Samples

0

Samples exceeding legal limit (MCL)

107

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20144.02 ppb550.800 ppb - 5.30 ppb
20153.77 ppb21210.600 ppb - 10.3 ppb
20163.34 ppb21210.600 ppb - 7.80 ppb
20173.95 ppb21210.800 ppb - 8.80 ppb
20182.55 ppb20200.700 ppb - 7.70 ppb
20191.89 ppb2119ND - 4.90 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 Result
2014-01-140.800 ppb
2014-01-145.30 ppb
2014-04-235.20 ppb
2014-08-274.90 ppb
2014-10-233.90 ppb
2015-01-226.40 ppb
2015-01-224.30 ppb
2015-01-220.600 ppb
2015-01-224.00 ppb
2015-02-041.80 ppb
2015-02-048.50 ppb
2015-04-2110.3 ppb
2015-04-219.20 ppb
2015-04-210.600 ppb
2015-04-211.20 ppb
2015-05-215.70 ppb
2015-07-215.30 ppb
2015-07-212.70 ppb
2015-07-210.800 ppb
2015-07-212.00 ppb
2015-08-183.60 ppb
2015-10-222.20 ppb
2015-10-221.10 ppb
2015-10-222.20 ppb
2015-10-221.70 ppb
2015-12-094.90 ppb
2016-01-191.20 ppb
2016-01-196.50 ppb
2016-01-196.00 ppb
2016-01-192.10 ppb
2016-01-192.80 ppb
2016-01-196.90 ppb
2016-04-197.80 ppb
2016-04-197.10 ppb
2016-04-192.50 ppb
2016-04-194.10 ppb
2016-04-196.60 ppb
2016-07-201.60 ppb
2016-07-200.900 ppb
2016-07-200.800 ppb
2016-07-201.40 ppb
2016-08-254.30 ppb
2016-10-172.60 ppb
2016-10-171.10 ppb
2016-10-170.600 ppb
2016-10-170.900 ppb
2016-10-172.40 ppb
2017-01-198.80 ppb
2017-01-196.70 ppb
2017-01-195.00 ppb
2017-01-192.90 ppb
2017-02-271.60 ppb
2017-02-278.20 ppb
2017-04-185.70 ppb
2017-04-183.40 ppb
2017-04-182.10 ppb
2017-04-181.90 ppb
2017-06-280.800 ppb
2017-07-176.10 ppb
2017-07-171.70 ppb
2017-07-171.70 ppb
2017-07-171.90 ppb
2017-08-305.70 ppb
2017-10-162.90 ppb
2017-10-161.40 ppb
2017-10-163.90 ppb
2017-10-162.40 ppb
2017-11-148.10 ppb
2018-01-181.80 ppb
2018-01-181.10 ppb
2018-01-183.80 ppb
2018-01-182.10 ppb
2018-03-093.00 ppb
2018-03-097.70 ppb
2018-04-192.30 ppb
2018-04-194.60 ppb
2018-04-191.30 ppb
2018-04-190.900 ppb
2018-06-134.60 ppb
2018-07-166.90 ppb
2018-07-162.60 ppb
2018-07-160.700 ppb
2018-07-161.10 ppb
2018-09-071.000 ppb
2018-10-181.000 ppb
2018-10-181.10 ppb
2018-10-181.10 ppb
2018-10-182.20 ppb
2019-01-181.20 ppb
2019-01-181.20 ppb
2019-01-182.00 ppb
2019-01-181.50 ppb
2019-03-061.40 ppb
2019-03-06ND
2019-04-081.10 ppb
2019-04-081.40 ppb
2019-04-081.90 ppb
2019-04-082.00 ppb
2019-04-25ND
2019-07-084.10 ppb
2019-07-153.90 ppb
2019-07-153.00 ppb
2019-07-150.900 ppb
2019-07-151.60 ppb
2019-10-102.50 ppb
2019-10-101.20 ppb
2019-10-102.00 ppb
2019-10-101.90 ppb
2019-10-234.90 ppb