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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

King County Water District #49

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND160ND
2015ND160ND
2016ND160ND
20170.184 ppb163ND - 1.18 ppb
20180.148 ppb163ND - 0.960 ppb
20190.171 ppb162ND - 1.43 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
2014-03-1304541ND
2014-03-1304543ND
2014-03-1304544ND
2014-03-1304542ND
2014-06-0910277ND
2014-06-0910275ND
2014-06-0910276ND
2014-06-0910278ND
2014-09-1116827ND
2014-09-1116824ND
2014-09-1116826ND
2014-09-1116825ND
2014-12-1524068ND
2014-12-1524066ND
2014-12-1524067ND
2014-12-1524069ND
2015-03-1267104ND
2015-03-1267102ND
2015-03-1267103ND
2015-03-1267101ND
2015-06-1822304ND
2015-06-1822303ND
2015-06-1822302ND
2015-06-1822301ND
2015-09-2302903ND
2015-09-2302901ND
2015-09-2302902ND
2015-09-2302904ND
2015-12-0968203ND
2015-12-0968202ND
2015-12-0968201ND
2015-12-0968204ND
2016-03-18ND
2016-03-18ND
2016-03-18ND
2016-03-18ND
2016-06-20ND
2016-06-20ND
2016-06-20ND
2016-06-20ND
2016-09-15ND
2016-09-15ND
2016-09-15ND
2016-09-15ND
2016-12-28ND
2016-12-28ND
2016-12-28ND
2016-12-28ND
2017-03-17ND
2017-03-17ND
2017-03-171.12 ppb
2017-03-17ND
2017-06-14ND
2017-06-141.18 ppb
2017-06-14ND
2017-06-14ND
2017-09-01ND
2017-09-01ND
2017-09-010.640 ppb
2017-09-01ND
2017-12-11ND
2017-12-11ND
2017-12-11ND
2017-12-11ND
2018-03-14ND
2018-03-14ND
2018-03-14ND
2018-03-140.850 ppb
2018-06-13ND
2018-06-13ND
2018-06-13ND
2018-06-130.960 ppb
2018-09-13ND
2018-09-13ND
2018-09-13ND
2018-09-13ND
2018-12-12ND
2018-12-120.550 ppb
2018-12-12ND
2018-12-12ND
2019-03-14ND
2019-03-14ND
2019-03-14ND
2019-03-14ND
2019-06-19ND
2019-06-191.43 ppb
2019-06-19ND
2019-06-19ND
2019-09-12ND
2019-09-121.30 ppb
2019-09-12ND
2019-09-12ND
2019-12-10ND
2019-12-10ND
2019-12-10ND
2019-12-10ND