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EWG's Tap Water Database — 2019 UPDATE

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Dibromochloromethane

Housatonic Water Works

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.

 

15

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013ND10ND
2014ND10ND
20150.130 ppb41ND - 0.520 ppb
20160.203 ppb41ND - 0.810 ppb
20170.104 ppb51ND - 0.520 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
2013-11-12ND
2014-10-14ND
2015-02-10ND
2015-05-12ND
2015-08-110.520 ppb
2015-11-12ND
2016-02-17ND
2016-05-10ND
2016-08-090.810 ppb
2016-11-08ND
2017-02-14ND
2017-05-09ND
2017-08-080.520 ppb
2017-11-15ND
2017-11-15ND