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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Makawao

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

 

88

Samples

0

Samples exceeding legal limit (MCL)

50

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
20150.342 ppb175ND - 1.60 ppb
2016ND170ND
20171.03 ppb2017ND - 1.60 ppb
20180.885 ppb1712ND - 1.90 ppb
20191.50 ppb17170.720 ppb - 2.40 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
2015-01-142015011602291.60 ppb
2015-01-142015011602301.40 ppb
2015-01-142015011602310.960 ppb
2015-01-142015011602321.30 ppb
2015-01-27201501290273ND
2015-04-09201504140804ND
2015-04-09201504140803ND
2015-04-102015041602690.560 ppb
2015-04-10201504160270ND
2015-07-17201507210214ND
2015-07-17201507210218ND
2015-07-17201507210219ND
2015-07-17201507210221ND
2015-10-08201510130662ND
2015-10-08201510130661ND
2015-10-08201510130660ND
2015-10-08201510130657ND
2016-01-07ND
2016-01-07ND
2016-01-07ND
2016-01-07ND
2016-02-19ND
2016-04-14ND
2016-04-14ND
2016-04-14ND
2016-04-14ND
2016-07-15ND
2016-07-15ND
2016-07-15ND
2016-07-15ND
2016-10-06ND
2016-10-06ND
2016-10-06ND
2016-10-06ND
2017-01-121.20 ppb
2017-01-120.850 ppb
2017-01-12ND
2017-01-121.40 ppb
2017-01-271.50 ppb
2017-01-31ND
2017-01-31ND
2017-01-310.500 ppb
2017-04-061.60 ppb
2017-04-061.000 ppb
2017-04-061.60 ppb
2017-04-061.60 ppb
2017-07-131.30 ppb
2017-07-131.10 ppb
2017-07-131.10 ppb
2017-07-131.20 ppb
2017-10-061.10 ppb
2017-10-061.30 ppb
2017-10-060.880 ppb
2017-10-061.30 ppb
2018-01-112018011806651.30 ppb
2018-01-112018011806661.50 ppb
2018-01-112018011806681.40 ppb
2018-01-112018011806671.50 ppb
2018-02-202018010310011.000 ppb
2018-04-05201804110015ND
2018-04-052018041100130.660 ppb
2018-04-052018041100160.530 ppb
2018-04-05201804110014ND
2018-07-02201807060504ND
2018-07-02201807060503ND
2018-07-022018070605020.550 ppb
2018-07-02201807060505ND
2018-10-042018100905261.50 ppb
2018-10-042018100905231.90 ppb
2018-10-042018100905241.60 ppb
2018-10-042018100905251.60 ppb
2019-01-032019010800852.40 ppb
2019-01-032019010800862.00 ppb
2019-01-032019010800881.60 ppb
2019-01-032019010800871.60 ppb
2019-02-082019021203071.20 ppb
2019-04-022019040403922.30 ppb
2019-04-022019040403931.80 ppb
2019-04-022019040403912.00 ppb
2019-04-022019040403902.10 ppb
2019-07-262019073003230.900 ppb
2019-07-262019073003240.720 ppb
2019-07-262019073003211.000 ppb
2019-07-262019073003220.870 ppb
2019-10-032019100806101.60 ppb
2019-10-032019100806081.20 ppb
2019-10-032019100806111.000 ppb
2019-10-032019100806091.20 ppb