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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Northwestern W and Sd-wtln 200

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.

MORE ABOUT THIS CONTAMINANT

 

82

Samples

0

Samples exceeding legal limit (MCL)

46

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.433 ppb128ND - 0.900 ppb
20150.463 ppb86ND - 0.700 ppb
20160.800 ppb85ND - 1.60 ppb
20170.554 ppb2813ND - 1.70 ppb
20182.03 ppb14140.700 ppb - 3.10 ppb
20190.175 ppb123ND - 0.800 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 Lab ID Result
2014-02-13AG64691ND
2014-02-13AG64690ND
2014-05-08AG70335ND
2014-05-08AG70334ND
2014-08-12AG776340.900 ppb
2014-08-12AG776360.700 ppb
2014-08-12AG776330.600 ppb
2014-08-12AG776350.600 ppb
2014-08-12AG776590.500 ppb
2014-08-12AG776600.600 ppb
2014-11-13AG856210.600 ppb
2014-11-13AG856200.700 ppb
2015-02-11AG907850.700 ppb
2015-02-11AG907860.700 ppb
2015-05-13AG964510.600 ppb
2015-05-13AG964520.600 ppb
2015-08-12AH03575ND
2015-08-12AH03576ND
2015-11-12AH100080.500 ppb
2015-11-12AH100070.600 ppb
2016-02-11AH15441ND
2016-02-11AH154420.500 ppb
2016-05-11AH21611ND
2016-05-11AH21612ND
2016-08-10AH279531.60 ppb
2016-08-10AH279541.60 ppb
2016-11-09AH356061.40 ppb
2016-11-09AH356071.30 ppb
2017-01-25AH41436ND
2017-01-25AH41441ND
2017-01-25AH41440ND
2017-01-25AH41439ND
2017-01-25AH41438ND
2017-01-25AH41437ND
2017-02-08AH43022ND
2017-02-08AH43021ND
2017-02-08AH43020ND
2017-02-08AH43019ND
2017-02-08AH43017ND
2017-02-08AH43018ND
2017-02-08AH43015ND
2017-02-08AH43016ND
2017-04-13AH472991.20 ppb
2017-04-13AH473001.20 ppb
2017-04-13AH473011.10 ppb
2017-04-13AH473021.20 ppb
2017-04-13AH473031.20 ppb
2017-04-13AH473041.30 ppb
2017-04-13AH473051.40 ppb
2017-04-13AH473061.70 ppb
2017-05-11AH49659ND
2017-05-11AH496581.10 ppb
2017-08-08AH569771.10 ppb
2017-08-08AH569781.50 ppb
2017-11-08AH641900.800 ppb
2017-11-08AH641910.700 ppb
2018-02-08AH698131.40 ppb
2018-02-08AH698140.900 ppb
2018-05-08AH758650.800 ppb
2018-05-08AH758660.700 ppb
2018-08-09AH828992.00 ppb
2018-08-09AH829002.00 ppb
2018-11-13AH901352.20 ppb
2018-11-13AH901362.10 ppb
2018-11-13AH901372.30 ppb
2018-11-13AH901382.20 ppb
2018-11-13AH901393.10 ppb
2018-11-13AH901403.00 ppb
2018-11-13AH901412.90 ppb
2018-11-13AH901422.80 ppb
2019-02-12AH95893ND
2019-02-12AH958920.700 ppb
2019-05-08AI018460.600 ppb
2019-05-08AI018470.800 ppb
2019-08-08AI08734ND
2019-08-08AI08735ND
2019-08-08AI08736ND
2019-08-08AI08737ND
2019-08-08AI08738ND
2019-08-08AI08739ND
2019-08-08AI08740ND
2019-08-08AI08741ND