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EWG's Tap Water Database — 2019 UPDATE

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Bromoform

Boston Harbor

Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

 

38

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND10ND
2014ND20ND
2015ND120ND
2016ND80ND
2017ND140ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.5 ppb

The EWG Health Guideline of 0.5 ppb for bromoform 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
2012-07-2701604ND
2013-07-1806012ND
2014-10-1613571ND
2014-12-2414683ND
2015-03-2515813ND
2015-03-3115849ND
2015-06-0216841ND
2015-06-0216843ND
2015-08-1117964ND
2015-08-1117962ND
2015-09-1618576ND
2015-09-1618577ND
2015-11-1019574ND
2015-11-1019573ND
2015-12-0719954ND
2015-12-0719956ND
2016-03-08ND
2016-03-15ND
2016-06-14ND
2016-06-14ND
2016-09-13ND
2016-09-13ND
2016-12-12ND
2016-12-12ND
2017-01-31ND
2017-01-31ND
2017-01-31ND
2017-01-31ND
2017-02-07ND
2017-02-07ND
2017-02-07ND
2017-06-27ND
2017-06-27ND
2017-08-16ND
2017-08-16ND
2017-08-16ND
2017-11-15ND
2017-11-15ND