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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

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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.

 

15

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
20150.193 ppb31ND - 0.580 ppb
20160.473 ppb42ND - 1.20 ppb
20170.144 ppb51ND - 0.720 ppb
20180.910 ppb220.620 ppb - 1.20 ppb
20190.600 ppb110.600 ppb

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 Result
2015-06-01ND
2015-08-240.580 ppb
2015-12-07ND
2016-05-12ND
2016-08-30ND
2016-08-301.20 ppb
2016-11-100.690 ppb
2017-03-010.720 ppb
2017-03-01ND
2017-05-11ND
2017-08-24ND
2017-10-04ND
2018-01-221.20 ppb
2018-06-040.620 ppb
2019-09-300.600 ppb